The No.1 Website for Pro Audio
 Search This Thread  Search This Forum  Search Reviews  Search Gear Database  Search Gear for sale  Search Gearslutz Go Advanced
Air flow resistivity, absorption and density for isolation products in Norway Modular Synthesizers
Old 27th January 2012
  #1
Gear Maniac
 

Air flow resistivity, absorption and density for isolation products in Norway

Products with density and air flow resistivity data:

Terminology: Air Flow Resistivity (in Norwegian: strømningsmotstand) is given in kPa*s/m2.

– Air flow resistivity is the same as gas flow resistivity (GFR).
– Pa*s/m2 is the same as Rayls (5000 Rayls is 5000 Pa*s/m2 , or 5 kPa*s/m2).

I use the terms "air flow resistivity" and "kPa*s/m2" because this is the terminology used in the technical documentation I have read, which is attached to this post.

The products are sorted according to their air flow resistivity value, lowest numbers first.


Hunton Flex (wood fiber product)
Density: 50 kg/m3, Air flow resistivity: Equal to, or more than 5 kPa*s/m2
Hunton Flex
Hunton Flex Produktark

Glava Plate 40
Density: 13.9 kg/m3, Air flow resistivity: 8.31 kPa*s/m2
Plate 40

Rockwool Flexi A Plate,
Density: 30 kg/m3, Air flow resistivity: 9 kPa*s/m2
Flexi A-plate

Rockwool Marine Batts 32
Density: 30 kg/m3, Air flow resistivity: 9 kPa*s/m2
Marine Batts 32

Rockwool Stålstenderplate
Density: 30 kg/m3, Air flow resistivity: 9 kPa*s/m2
Stålstenderplate

(Note: For Rockwool Flexi A, Marine Batts 32 and Stålstenderplate, there are two tests, in test 1 density is measured to 28.6, air flow resistivity to 8.26, in test 2, density is measured to 31.1, air flow resistivity to 10.2. See attached PDFs. The test specimen is named A-plate in test 1 and RW Flex A148 in test 2, I have confirmed with Rockwool that this type of insulation product is marketed as both Flexi A-plate, Marine Batts 32 and Stålstenderplate.)

Glava Plate A 37
Density: 17.5 kg/m3, Air flow resistivity: 10.5 kPa*s/m2
Plate A 37

Rockwool Rockfon Industrial
Density: 70 kg/m3, Air flow resistivity: 21.4 kPa*s/m2
Rockfon Industrial
Rockfon Industrial absorption

Rockwool Lydplate:
Density: 59.4 kg/m3, Air flow resistance: 27.6 kPa*s/m2
Rockwool Lydplate


Note: In the measurement and publication standard EN 13162 it is required for the manufacturers to publish the lowest measurement of sound absorption and air flow resistivity:

4.3.11 Sound absorption
"[…] No result of ap and aw shall be lower than the declared level."

4.3.12 Air flow resistivity
"[…] The value of air flow resistivity shall be declared in levels with steps of 1 kPa·s/m3. No test result shall be lower than the declared value."

Link: EN 13162

(Note: Air flow resistivity is declared in kPa·s/m2, not kPa·s/m3. This has to be a typing error in the standard.)

The manufactureres have several measurements of a product's air flow resistivity, and publish the lowest number. I've talked to both Isover and Rockwool tech support but no one seems to know how wide this range of measurements typically is. However, the two Glava measurements (of the same product) was 8.26 and 10.2, so there's a hint at least.


Products with sound absorption values:

Frequency ---------------------------------- : 100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150 4000 5000
Rockwool Marine Batts 45 - 50mm ----------------- : 0.12 0.11 0.27 0.33 0.47 0.630 0.73 0.77 0.77 0.770 0.850 0.860 0.860 0.8700 0.880 0.850 0.8700 0.900
Rockwool Marine Slab 60 - 50mm ------------------ : 0.12 0.09 0.25 0.41 0.54 0.730 0.83 0.86 0.85 0.890 0.910 0.930 0.920 0.9400 0.930 0.890 0.8900 0.930
Rockwool Marine Slab 60 - 50mm ( different test ) : 0.09 0.10 0.30 0.47 0.69 0.970 0.81 0.94 0.86 0.950 0.920 0.930 0.900 0.8800 0.900 0.870 0.9100 0.870
Rockwool Marine Slab 80 - 50mm ------------------ : 0.14 0.15 0.31 0.47 0.60 0.820 0.88 0.89 0.90 0.890 0.920 0.950 0.920 0.9100 0.930 0.920 0.9300 0.960
Rockwool Marine Slab 80 - 100mm ----------------- : 0.46 0.54 0.75 0.68 0.74 0.840 0.88 0.93 0.91 0.900 0.950 0.960 0.950 0.9600 0.950 0.950 0.9500 0.990
Rockwool Marine Slab 140 - 50mm ----------------- : 0.17 0.26 0.42 0.58 0.63 0.780 0.80 0.82 0.86 0.820 0.860 0.910 0.870 0.8800 0.920 0.910 0.9300 0.960
Rockwool Marine Slab 150 - 50mm ----------------- : 0.14 0.17 0.44 0.59 0.69 0.870 0.77 0.77 0.81 0.720 0.730 0.700 0.720 0.7300 0.760 0.760 0.7900 0.810
Rockwool Marine Slab 200 - 30mm ----------------- : 0.07 0.07 0.18 0.28 0.44 0.610 0.77 0.76 0.79 0.790 0.790 0.820 0.810 0.8500 0.850 0.880 0.8800 0.910
Rockwool Marine Slab 200 - 50mm ----------------- : 0.14 0.17 0.44 0.59 0.69 0.870 0.77 0.77 0.81 0.720 0.730 0.700 0.720 0.7300 0.760 0.760 0.7900 0.810
Rockwool Marine Slab 200 - 60mm ----------------- : 0.26 0.41 0.65 0.60 0.59 0.660 0.69 0.71 0.74 0.760 0.780 0.830 0.830 0.8500 0.860 0.880 0.9000 0.940
Rockwool Marine Firebatts 100 - 40mm ------------ : 0.13 0.14 0.23 0.29 0.43 0.710 0.85 0.84 0.87 0.850 0.900 0.930 0.900 0.9100 0.890 0.910 0.9000 0.900
Rockwool Marine Firebatts 120 - 75mm ------------ : ----- 0.35 ----- ---- 0.40 ------- ---- 0.55 ----- ----- --0.60-- ----- ----- --0.80-- ------ ----- --0.90-- -----
Rockwool Marine Firebatts 130 - 30mm ------------ : 0.06 0.04 0.12 0.26 0.41 0.580 0.72 0.80 0.82 0.730 0.760 0.730 0.710 0.7300 0.740 0.770 0.7900 0.830
Rockwool Marine Firebatts 130 - 50mm ------------ : 0.17 0.11 0.33 0.58 0.69 0.920 0.84 0.89 0.83 0.810 0.760 0.780 0.740 0.7500 0.800 0.760 0.8300 0.840
Rockwool Marine Firebatts 130 - 60mm ------------ : 0.20 0.31 0.51 0.59 0.69 0.810 0.86 0.85 0.84 0.840 0.880 0.880 0.880 0.8700 0.880 0.900 0.9200 0.930
Rockwool Marine Firebatts 150 - 100mm ----------- : 0.47 0.53 0.67 0.61 0.68 0.780 0.80 0.84 0.85 0.870 0.920 0.930 0.910 0.9200 0.910 0.900 0.9100 0.930
Rockwool Marine Wired Mat 80 - 50mm ------------ : 0.12 0.18 0.35 0.60 0.81 1.010 1.01 0.88 0.90 0.920 0.900 0.850 0.930 0.8200 0.870 0.860 0.8500 0.950
Rockwool Marine Wired Mat 80 - 50mm inc alu foil : 0.23 0.30 0.74 0.56 0.64 0.780 0.84 0.82 0.84 0.800 0.790 0.800 0.800 0.7200 0.700 0.660 0.5700 0.540
Rockwool Marine Wired Mat 80 - 100mm ---------- : 0.42 0.51 0.86 0.87 0.90 1.010 0.97 0.97 0.90 0.950 0.900 0.920 0.960 0.8800 0.850 0.910 0.8800 0.960
Rockwool Marine Wired Mat 80 -100mm inc alu foil: 0.69 0.63 0.69 0.68 0.78 0.860 0.80 0.87 0.85 0.880 0.860 0.820 0.850 0.7900 0.740 0.630 0.5800 0.510
Rockwool Marine Wired Mat 90 - 45mm ----------- : 0.15 0.17 0.37 0.52 0.63 0.820 0.87 0.88 0.89 0.890 0.910 0.950 0.920 0.9000 0.900 0.890 0.8700 0.900
Rockwool Marine Wired Mat 90 - 90mm ----------- : 0.50 0.53 0.74 0.68 0.73 0.860 0.88 0.90 0.93 0.890 0.930 0.990 0.930 0.9300 0.940 0.910 0.8800 0.900
Rockwool Marine Wired Mat 105 - 30mm ---------- : 0.06 0.04 0.14 0.34 0.43 0.730 0.76 0.78 0.82 0.860 0.820 0.830 0.840 0.8100 0.780 0.830 0.8300 0.920
Rockwool Marine Wired Mat 105 - 75mm ---------- : 0.43 0.49 0.71 0.65 0.73 0.840 0.84 0.87 0.86 0.880 0.900 0.920 0.900 0.9000 0.920 0.8800 0.870 0.900
Rockwool Marine Wired Mat 105 - 100mm -------- : 0.56 0.55 0.54 0.54 0.70 0.810 0.81 0.87 0.87 0.880 0.930 0.960 0.930 0.9300 0.920 0.9000 0.920 0.910
Rockwool Lamellmatte 541 - 15mm - inc alu foil - : 0.06 0.02 0.08 0.16 0.29 0.420 0.67 0.84 0.69 0.430 0.320 0.190 0.150 0.1500 0.180 0.2300 0.290 0.310
Rockwool Lamellmatte 541 - 50mm - inc alu foil - : 0.22 0.25 0.64 0.79 0.79 0.610 0.38 0.31 0.34 0.380 0.490 0.550 0.520 0.4700 0.450 0.5100 0.610 0.700
Rockwool Lamellmatte 541 - 100mm - inc alu foil : 0.55 0.49 0.67 0.61 0.56 0.540 0.44 0.60 0.67 0.570 0.510 0.530 0.530 0.4300 0.370 0.3500 0.330 0.280
Rockwool Nettingmatte 80 - 50mm - -------------- : 0.12 0.18 0.35 0.60 0.81 1.010 1.01 0.88 0.90 0.920 0.900 0.850 0.930 0.8200 0.870 0.8600 0.850 0.950
Rockwool Nettingmatte 80 - 100mm --------------- : 0.42 0.51 0.86 0.87 0.90 1.010 0.97 0.97 0.90 0.950 0.900 0.920 0.960 0.8800 0.850 0.9100 0.880 0.960
Rockwool Nettingmatte 105 - 30mm --------------- : 0.06 0.04 0.14 0.34 0.43 0.730 0.76 0.78 0.82 0.860 0.820 0.830 0.840 0.8100 0.780 0.8300 0.830 0.920
Rockwool Nettingmatte 105 - 50mm --------------- : 0.19 0.25 0.67 0.61 0.70 0.780 0.84 0.89 0.83 0.850 0.840 0.830 0.830 0.7400 0.730 0.6500 0.560 0.510
Rockwool Nettingmatte 105 - 100mm ------------- : 0.51 0.56 0.79 0.79 0.83 0.950 0.97 0.93 0.90 0.930 0.960 0.930 0.950 0.8800 0.860 0.8900 0.900 0.900
Rockwool Rockfon Industrial - 50mm -------------- : ----- 0.20 ----- ---- 0.70 ------- ---- 1.00 ----- ----- -1.00-- ----- ------ --1.00-- ------ -------- 1.00- -----
Rockwool Rockfon Industrial - 100mm ------------- : ----- 0.65 ----- ---- 0.85 ------- ---- 1.00 ----- ----- -1.00-- ----- ------ --0.95-- ------ -------- 0.95- -----
Rockwool ProRox WM70 - 50mm - (new 2012) --- : 0.17 0.29 0.46 0.57 0.80 0.890 1.01 1.10 1.08 1.060 1.090 1.050 1.060 1.0900 1.070 1.0500 1.080 1.050
Rockwool ProRox WM80 - 50mm - (new 2012) --- : 0.16 0.38 0.59 0.66 0.85 0.890 1.04 1.05 1.00 1.040 1.070 1.010 1.030 1.0600 1.060 1.0700 1.050 1.040
Rockwool ProRox WM100 - 50mm - (new 2012) -- : 0.16 0.37 0.60 0.64 0.86 0.910 1.01 1.07 1.03 1.020 1.050 1.000 1.010 1.0800 1.070 1.0900 1.070 1.050
Rockwool ProRox WM70 - 100mm - (new 2012) -- : 0.70 0.94 0.96 0.81 0.94 0.980 1.02 1.07 1.01 1.000 1.020 1.050 1.050 1.0800 1.070 1.0900 1.070 1.060
Rockwool ProRox WM80 - 100mm - (new 2012) -- : 0.77 0.90 0.88 0.77 0.89 0.920 0.95 1.00 0.97 1.000 1.050 1.030 1.050 1.0600 1.070 1.0500 1.040 1.050
Rockwool ProRox WM100 - 100mm - (new 2012) - : 0.90 0.92 0.85 0.74 0.84 0.910 0.94 1.02 0.95 1.010 1.040 1.050 1.030 1.0700 1.100 1.0600 1.070 1.070
Glava lydfelleplate 2000 - 25mm ------------------ : ------ 0.05 ----- ---- 0.30 ------- ----- 0.65 ----- ----- -1.00-- ----- ------ --1.00-- ------ -------- 0.95- -----
Glava lydfelleplate 2000 - 50mm ------------------ : ------ 0.15 ----- ---- 0.70 ------- ----- 1.00 ----- ----- -1.00-- ----- ------ --0.95- ------ --------- 0.90- -----
Glava lydfelleplate 2000 - 100mm ----------------- : ------ 0.70 ----- ---- 1.00 ------- ----- 1.00 ----- ----- -1.00-- ----- ------ --1.00-- ------ -------- 0.95- -----

Note: The third and fourth decimal are arbitrary add-ons to insure readability of the table.

The ProRox series is very good. However, it is not on the market in Norway just yet. It will be introduced during 2012, in the "Prosess" category. I was told this is a "European" product - meaning, it is not country-specific. It is for sale in many European countries already. It is interesting to note that it is made for the same duct/ventilation market as OC's 700 series. The noise in these environments are at least some times more bass heavy than usual, maybe the products are designed with this in mind. (I read in a report that dealt with noise issues in small water power plants that the dominating noise in ducts/ventilation is below 250hz, see page 31 in this (Norwegian) PDF: Støy i små vannkraftverk

Rockwool ProRox air flow resistivity: Equal to, or more than 50 kPa*s/m2
(Got this info from Rockwool tech support in Germany).

I got the Rockwool Marine absorption values here (se page 48 to 56): Rockwool Marine & Offshore Acoustic Manual

For the other, see attached measurement PDFs. Note: Lamella Mat = Lamellmatte 541. Wired Mat = Nettingmatte.

Some numbers I don't have publicly available references for, I got them from Rockwool, Isover and Glava by email.

Regarding sound absorption values in general: The European measurement procedures (ISO 354) produces sligthly less impressive data than the American equivalent (ASTM C423), probably in some part due to the dimension difference for the tested material. See these post:
https://www.gearslutz.com/board/7427015-post13.html
https://www.gearslutz.com/board/7428773-post33.html

The ISO 354 standard: ISO 354
The ASTM C 423 standard: ASTM C423



Products with density values:

Glava Lydplate (Isover type glass wool product): 22 kg/m3
Glava Lydplate

Glava Lydfelleplate 2000 (Isover-type glass wool product): Density 35 kg/m3
Glava Lydfelleplate 2000
Glava Lydfelleplate 2000 teknisk godkjenning

Rockwool Lamellmatte 541: Density 30 kg/m3

Rockwool IKI-Batts: Density 60 kg/m3

Rockwool Hardrock Fasadeplate: Dual density; the thick layer is 100 kg/m3, the thin layer is 180 kg/m3.

Density values for Rockwool Marine products: Rockwool Marine and Offshore density values



How to interpret density values:

There is a relationship between density and air flow resistivity, but it is loose, very non-linear. Generally, denser products means higher air flow resistivity, but with the same density, glass wool products will typically have higher air flow resistivity than stone wool products, and there are large variations in the density/flow resistivity correlation within these two main product groups, generated by other factors. A very rough understanding of the relationship between density and air flow resistivity can be derived from density/flow resistivity correlation graphs provided by the manufacturers. I have these numbers from Rockwool, Isover, and from an independent Norwegian construction research institution (Byggforsk):

Air flow resistivity -------------------- : 5 kPa*s/m2 - 10 kPa*s/m2 - 20 kPa*s/m2 - 30 kPa*s/m2 - 40 kPa*s/m2 - 50 kPa*s/m2
Rockwool stone wool products: ------------- : 9-31 kg/m3 ----- 24-49 kg/m3 ----- 36-75 kg/m3 ---- 47-98 kg/m3 ------ 56-120 kg/m3 --- 64 -130 kg/m3
Isover stone wool products: ---------------- : 27-40 kg/m3 --- >50 kg/m3 ---------------------------------------------------------------------------------------
Unspecified Nordic stone wool products --- : ------------------- 32-37 kg/m3 ----- 38-52 kg/m3 ---- 53-65 kg/m3 ----- 70-80 kg/m3 ----- 80-90 kg/m3
Isover glass wool products: ---------------- : 9-18 kg/m3 ----- 15-30 kg/m3 ----- 27-45 kg/m3 ---------------------------------------------------------------
Unspecified Nordic glass wool products --- : ------------------- 13-27 kg/m3 ----- 33-45 kg/m3 ---- 47-58 kg/m3 ----- 65-75 kg/m3 ----- 75-85 kg/m3

Note: The graphs are hard too read with any accuracy, so don't take the numbers too seriously. But if you are interested in this, there are more information in the graphs than in the numbers displayed here. Be aware that when a manufacturer estimates the performance of competing products, it will be portrayed as "bad" as reasonably possible.


Links to graphs:

Rockwool:
Rockwool flow resistivity/density correlation graph
Rockwool Marine & Offshore Acoustic Manual (page 23)

Isover (see page 9):
Isover flow resistivity/density correlation graph

Byggforsk (older, unspecified Nordic insulation products):
Byggforsk flow resistivity/density correlation graph (page 6)


***


If you have some other acoustic data, relevant for Norway, please share.
Old 27th January 2012
  #2
Lives for gear
 
avare's Avatar
 

Fantastic!

Andre
Old 11th June 2012
  #3
NLP
Gear Addict
 
NLP's Avatar
 

Quote:
Originally Posted by tlindaas View Post
Products with density and air flow resistivity data:

4.3.12 Air flow resistivity
"[…] The value of air flow resistivity shall be declared in levels with steps of 1 kPa·s/m3. No test result shall be lower than the declared value."

Link: EN 13162

(Note: Air flow resistivity is declared in kPa·s/m2, not kPa·s/m3. This has to be a typing error in the standard.)
Yes.
There is also airflow resistance:
3.2.1 airflow resistance, R; mks acoustic ohm (Pa·s/m 3)—the quotient of the air pressure difference across a specimen divided by the volume velocity of airflow through the specimen.
3.2.2 airflow resistivity, r0; mks rayl/m (Pa·s/m 2)— of a homogeneous material, the quotient of its specific airflow resistance divided by its thickness.
Untitled Document
Old 30th September 2012
  #4
Gear nut
 

Hi.

I have the Glava Proff 35 with the following specs:

-----------------------------------------
7 pieces - covers 4,79 m2

5,9 inches thick

^ D = 0,035 W/m * K
RD = 4,25 m2 * K/W

---------------------------------------

10 pieces - covers 6,84 m2

3,9 inches thick

^ D = 0,035 W/m * K
RD = 2,85 m2 * K/W

----------------------------------------

14 pieces - covers 9,58

2,8 inches thick

^ D = 0,035 W/m * K
RD = 2,00 m2 * K/W

----------------------------------------

I can´t figure out the density.

How could this be used for absorption of high, mid and bass?
Old 30th September 2012
  #5
Gear Maniac
 

You have to call/email them and ask. They told me earlier they have a lot of data they don't publish, they publish only what they think the "regular consumer" has an interest in knowing.

Ask for density and air flow resistivity ("strømningsmotstand").

email: byggteknisk @ glava.no
phone: 69818400, ask for Martine Kartnes or Knut Olav Brecke.


Quote:
Originally Posted by Mastergod View Post
Hi.

I have the Glava Proff 35 with the following specs:

-----------------------------------------
7 pieces - covers 4,79 m2

5,9 inches thick

^ D = 0,035 W/m * K
RD = 4,25 m2 * K/W

---------------------------------------

10 pieces - covers 6,84 m2

3,9 inches thick

^ D = 0,035 W/m * K
RD = 2,85 m2 * K/W

----------------------------------------

14 pieces - covers 9,58

2,8 inches thick

^ D = 0,035 W/m * K
RD = 2,00 m2 * K/W

----------------------------------------

I can´t figure out the density.

How could this be used for absorption of high, mid and bass?
Old 1st October 2012
  #6
Gear nut
 

Here is the answer from Glava.

Density Glava PROFF 35: 16,4 kg/m3.
Old 23rd February 2013
  #7
Gear Maniac
 

Rockwool ProRox WM100 - 100mm

hi tlindaas
Perhaps you have an idea how they allow to the Rockwool ProRox WM100 to Absorb high frequencies

According to the calculations that i have done with I use perforated mesh with 25mm diameter holes with 0.7mm Intervals
i get Only low frequency absorption?
thanks
Attached Thumbnails
Air flow resistivity, absorption and density for isolation products in Norway-picture-32.jpg  
Old 25th February 2013
  #8
Gear Maniac
 

You have panel thickness at 1mm. Try 100.

Quote:
Originally Posted by dor baruch View Post
hi tlindaas
Perhaps you have an idea how they allow to the Rockwool ProRox WM100 to Absorb high frequencies

According to the calculations that i have done with I use perforated mesh with 25mm diameter holes with 0.7mm Intervals
i get Only low frequency absorption?
thanks
Old 25th February 2013
  #9
Lives for gear
 
avare's Avatar
 

Quote:
Originally Posted by dor baruch View Post
hi tlindaas
Perhaps you have an idea how they allow to the Rockwool ProRox WM100 to Absorb high frequencies

According to the calculations that i have done with I use perforated mesh with 25mm diameter holes with 0.7mm Intervals
i get Only low frequency absorption?
thanks
The repeat distance you have entered in the calculator
makes no sense. The repeat distance is the distance at which the holes start again, not the web thickness. See the configuration tab on the right in the software for a pretty picture.

Andre
Old 3rd April 2013
  #10
Gear Addict
 

I know it's a bit old but Just a quick and minor correction to the 1st post:

Quote:
Pa*s/m2 is the same as Rayls (5000 Rayls is 5000 Pa*s/m2 , or 5 kPa*s/m2)
This is incorrect.

Rayls are actually Pa*s/m [The test method is Pressure Differential across the sample / airflow velocity, so Pa / (m/s) ]
Rayls/m are ....... Pa*s/m2

Airflow resistivity of insulation batts is usually quoted as Rayls/m or Pa*s/m2 or kPa*s/m2
Old 3rd April 2013
  #11
Lives for gear
 
AwwDeOhh's Avatar
 

Quote:
Originally Posted by Sebg View Post
I know it's a bit old but Just a quick and minor correction to the 1st post:


This is incorrect.

Rayls are actually Pa*s/m [The test method is Pressure Differential across the sample / airflow velocity, so Pa / (m/s) ]
Rayls/m are ....... Pa*s/m2

Airflow resistivity of insulation batts is usually quoted as Rayls/m or Pa*s/m2 or kPa*s/m2
Right.
Thanks for the typo clarification
Old 3rd April 2013
  #12
Lives for gear
 

What is the typical range of resisivity that we are looking for in our applications in absorbtion?
Old 3rd April 2013
  #13
Gear Maniac
 

Try this calculator: Porous Absorber Calculator

Generally, the thinner the absorber, the higher the resistivity needs to be. It also depends on which bass frequencies are problematic in your room. If you only record singing, there is no need to worry about sub 100 hz frequencies. Guitar in standard tuning only goes down to 82 hz, bass to 42 hz.

A short but inaccurate answer to your actual question: 40 kPa*s/m2 resistivity for the thinnest absorbers (5 cm, 2 inches), 20 kPa*s/m2 for medium absorbers (15 cm, 6 inches), 5 kPa*s/m2 for the thickest (above 35 cm, 14 inches).

If you try the calculator you'll see that there is a tradeoff between a not so efficient taming of the deepest bass frequencies, and a more efficient taming of the mid bass frequencies. You'll have to choose..
Old 23rd April 2013
  #14
Gear Maniac
 

Knauf insulation products in the Nordic countries:

According to Knauf Norway, the DIY home market Space slab and Space roll products with lambda value 0.039 has a density of roughly 12 kg/m3.
And according to Knauf Germany, airflow resistivity for this particular density should be right below 5 kPa*s/m2 (see below for explanation).

Products with lambda value 0.037 has a density of 15 kg/m3, expected resistivity here is 5-6 kPa*s/m2.

Look for products named Space slab/roll, Crown slab/roll, Isolering plate/rull. These are different names for the same product. According to the sales rep I talked to you can find this same product in all the Nordic countries.

Links:
Knauf: Gjør-det-selv-isolasjon
Byggmax (retailer): Isolering & fuktsperre - Isolering, gips & plater - Billig byggematerial - BYGGmax

Note:
Knauf Tech Support in Germany told me to go for a 15 kg/m3 Norwegian Knauf product if I wanted air flow resistivity around 5 kPa*s/m2. They provided the following information:

TI 140 U: Nominal density 15 kg/m3, flow resistivity 5-6 kPa*s/m2
TI 135 U: Nominal density 21 kg/m3, flow resistivity 8-10 kPa*s/m2
TP 435 B: Nominal density 25 kg/m3, flow resistivity 10-12 kPa*s/m2

(See attachment for more info regarding these numbers.)

Unifit TI is the same as Classic. Snipped from email conversation with Knauf Germany: "classic 040 and unifit TI 140 are approximately 6 ±1 kPa *s/m² and from classic 035 and unifit TI 135 approximately 10 ±2 kPa *s/m²"

Knauf Germany Tech Support obviously believes there is some correlation between German and Nordic Knauf products when it comes to density and air flow resistivity.

Note 2: EU regulation requires insulation to be at least 5 kPa*s/m2. Norway is not part of the EU, but Sweden and Denmark is, so it could be that the Space roll/slab 039 is really 5 kPa*s/m2, while 037 is 6-7 kPa*s/m2.
Attached Thumbnails
Air flow resistivity, absorption and density for isolation products in Norway-knauf_airflow_resistivity.jpg  
Old 23rd April 2013
  #15
Gear Nut
Thanks for this. I was wondering about the density of the Knauf, but now i kinda know:P
Bought a pack of the 100mm slabs from byggmax the other day to try for some various thing in my mixroom

Sent from my HTC One X
Old 23rd April 2013
  #16
Gear Maniac
 

Paroc insulation products in Norway, Sweden and Denmark, see this post:

https://www.gearslutz.com/board/7493558-post9.html

The Scandinavian products are basically the same. They are also reasonably similar to products sold in Finland, Russia, Ukraina, Poland, the Baltic countries, and Germany: Snipped from email conversation with Paroc Norway:

"Produktene vi selger I Norge er laget på fabrikken vår I Hällekis Sverige. De er like de som selges i Sverige, men med den forskjellen at formatet kan være forskjellig. I Sverige bruker man 45 mm, 95 mm osv som trevirke, mens det i Norge brukes 48, 98 osv osv.

Grunnreseptene og kravene til produktene er også like på våre finske, polske og litauiske fabrikker, men grunnet f.eks forskjellige råstoffer kan produktene i disse landene avvike noe."

"Fabrikkene I Finland produserer hovedsakelig for det finske markedet, men har også noe eksport til Russland. Fabrikken i Litauen server de baltiske landene, mens fabrikken i Polen server også Tyskland, Hviterussland, Ukraina m.mer. Fabrikkene i Sverige server Skandinavia."
Old 24th January 2014
  #17
Gear Head
 

Quote:
Originally Posted by tlindaas View Post
Generally, the thinner the absorber, the higher the resistivity needs to be. It also depends on which bass frequencies are problematic in your room.
I am finding this thread invaluable in my search for the right products in Oslo.
I am an Aussie with "bare litt Norsk", so it ain't easy

Reading tindaas' comment above, I think I had an "A ha!" moment (not as in "Take on me", but rather as in "Eureka")

What I think I get now is that, rather than focussing on density of product, what I actually need to do is
1) work out my trouble frequencies (room modes, measurement, etc)
2) work out what physical construction/thickness of absorbers my studio will take
3) use the porous absorber calculator (or similar) to figure out the best air resistivity for my needs (i.e. my trouble frequencies and my thickness limits)
4) go source a product with that air resistivity at the thickness I need

Is that logical, or have I embarrassed myself?

John
Old 24th January 2014
  #18
Lives for gear
 
Jens Eklund's Avatar
Quote:
Originally Posted by EMinor7th View Post
What I think I get now is that, rather than focussing on density of product, what I actually need to do is
1) work out my trouble frequencies (room modes, measurement, etc)
2) work out what physical construction/thickness of absorbers my studio will take
3) use the porous absorber calculator (or similar) to figure out the best air resistivity for my needs (i.e. my trouble frequencies and my thickness limits)
4) go source a product with that air resistivity at the thickness I need


But unless you can make your absorbers very thick, I would also look at pressure based absorbers to combat modal and SBIR issues.
Old 25th January 2014
  #19
Gear Head
 

Quote:
Originally Posted by Jens Eklund View Post


But unless you can make your absorbers very thick, I would also look at pressure based absorbers to combat modal and SBIR issues.
It took me a while to process this, but I think you are saying that there are more sophisticated absorber designs/compositions than just a thick slab of something, and that these other options take less space.

If you're not saying that then you lost me

Do you have a good link to some info on pressure absorbers. I will google it, too.

Thanks
Old 25th January 2014
  #20
Lives for gear
 
Bjorn Omholt's Avatar
 

The best flat pressure based traps IMO:
Modex
Modex
Old 26th January 2014
  #21
Lives for gear
 
Jens Eklund's Avatar
Quote:
Originally Posted by EMinor7th View Post
It took me a while to process this, but I think you are saying that there are more sophisticated absorber designs/compositions than just a thick slab of something, and that these other options take less space.
Exactly.

Velocity based vs. pressure based absorbers
Old 29th January 2014
  #22
Gear Head
 

Paroc eXtra

Thanks, Jens. I did look into that thread and saw a long discussion about velocity-based absorbers

-------------------------------------------
Norwegian slutz,

I added the resistivity data for Paroc eXtra to the "Sweden" thread, because that's where the rest of the Paroc data is.

I add it here as well because you can buy it at Maxbo

It would probably be a decent choice for deeeep bass-traps
Old 29th January 2014
  #23
Lives for gear
 
Bjorn Omholt's Avatar
 

Does anyone know about porous material with 5 kPa*s/m2 or lower in Norway? 8-9 kPa*s/m2 isn't low enough when using very thick material.
Old 29th January 2014
  #24
Gear Head
 

As per post #14 above, lambda 39 space roll/slab should be 5 kPa.s/m2
You can get it cheap at Byggmax too.

That link is to the roll, but they sell it in slabs also.
Old 17th February 2014
  #25
Gear interested
 

What is the GFR for Paroc A-Plate Extra C-600? Planning on covering my rear wall with 40cm of this stuff to tame the front-back node. Couldn't find it in any of these lists.
Old 12th January 2017
  #26
Gear Maniac
Quote:
Originally Posted by tlindaas View Post
Products with density and air flow resistivity data:

Terminology: Air Flow Resistivity (in Norwegian: strømningsmotstand) is given in kPa*s/m2.

– Air flow resistivity is the same as gas flow resistivity (GFR).
– Pa*s/m2 is the same as Rayls (5000 Rayls is 5000 Pa*s/m2 , or 5 kPa*s/m2).

I use the terms "air flow resistivity" and "kPa*s/m2" because this is the terminology used in the technical documentation I have read, which is attached to this post.

The products are sorted according to their air flow resistivity value, lowest numbers first.


Hunton Flex (wood fiber product)
Density: 50 kg/m3, Air flow resistivity: Equal to, or more than 5 kPa*s/m2
Hunton Flex
Hunton Flex Produktark

Glava Plate 40
Density: 13.9 kg/m3, Air flow resistivity: 8.31 kPa*s/m2
Plate 40

Rockwool Flexi A Plate,
Density: 30 kg/m3, Air flow resistivity: 9 kPa*s/m2
Flexi A-plate

Rockwool Marine Batts 32
Density: 30 kg/m3, Air flow resistivity: 9 kPa*s/m2
Marine Batts 32

Rockwool Stålstenderplate
Density: 30 kg/m3, Air flow resistivity: 9 kPa*s/m2
Stålstenderplate

(Note: For Rockwool Flexi A, Marine Batts 32 and Stålstenderplate, there are two tests, in test 1 density is measured to 28.6, air flow resistivity to 8.26, in test 2, density is measured to 31.1, air flow resistivity to 10.2. See attached PDFs. The test specimen is named A-plate in test 1 and RW Flex A148 in test 2, I have confirmed with Rockwool that this type of insulation product is marketed as both Flexi A-plate, Marine Batts 32 and Stålstenderplate.)

Glava Plate A 37
Density: 17.5 kg/m3, Air flow resistivity: 10.5 kPa*s/m2
Plate A 37

Rockwool Rockfon Industrial
Density: 70 kg/m3, Air flow resistivity: 21.4 kPa*s/m2
Rockfon Industrial
Rockfon Industrial absorption

Rockwool Lydplate:
Density: 59.4 kg/m3, Air flow resistance: 27.6 kPa*s/m2
Rockwool Lydplate


Note: In the measurement and publication standard EN 13162 it is required for the manufacturers to publish the lowest measurement of sound absorption and air flow resistivity:

4.3.11 Sound absorption
"[…] No result of ap and aw shall be lower than the declared level."

4.3.12 Air flow resistivity
"[…] The value of air flow resistivity shall be declared in levels with steps of 1 kPa·s/m3. No test result shall be lower than the declared value."

Link: EN 13162

(Note: Air flow resistivity is declared in kPa·s/m2, not kPa·s/m3. This has to be a typing error in the standard.)

The manufactureres have several measurements of a product's air flow resistivity, and publish the lowest number. I've talked to both Isover and Rockwool tech support but no one seems to know how wide this range of measurements typically is. However, the two Glava measurements (of the same product) was 8.26 and 10.2, so there's a hint at least.


Products with sound absorption values:

Frequency ---------------------------------- : 100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150 4000 5000
Rockwool Marine Batts 45 - 50mm ----------------- : 0.12 0.11 0.27 0.33 0.47 0.630 0.73 0.77 0.77 0.770 0.850 0.860 0.860 0.8700 0.880 0.850 0.8700 0.900
Rockwool Marine Slab 60 - 50mm ------------------ : 0.12 0.09 0.25 0.41 0.54 0.730 0.83 0.86 0.85 0.890 0.910 0.930 0.920 0.9400 0.930 0.890 0.8900 0.930
Rockwool Marine Slab 60 - 50mm ( different test ) : 0.09 0.10 0.30 0.47 0.69 0.970 0.81 0.94 0.86 0.950 0.920 0.930 0.900 0.8800 0.900 0.870 0.9100 0.870
Rockwool Marine Slab 80 - 50mm ------------------ : 0.14 0.15 0.31 0.47 0.60 0.820 0.88 0.89 0.90 0.890 0.920 0.950 0.920 0.9100 0.930 0.920 0.9300 0.960
Rockwool Marine Slab 80 - 100mm ----------------- : 0.46 0.54 0.75 0.68 0.74 0.840 0.88 0.93 0.91 0.900 0.950 0.960 0.950 0.9600 0.950 0.950 0.9500 0.990
Rockwool Marine Slab 140 - 50mm ----------------- : 0.17 0.26 0.42 0.58 0.63 0.780 0.80 0.82 0.86 0.820 0.860 0.910 0.870 0.8800 0.920 0.910 0.9300 0.960
Rockwool Marine Slab 150 - 50mm ----------------- : 0.14 0.17 0.44 0.59 0.69 0.870 0.77 0.77 0.81 0.720 0.730 0.700 0.720 0.7300 0.760 0.760 0.7900 0.810
Rockwool Marine Slab 200 - 30mm ----------------- : 0.07 0.07 0.18 0.28 0.44 0.610 0.77 0.76 0.79 0.790 0.790 0.820 0.810 0.8500 0.850 0.880 0.8800 0.910
Rockwool Marine Slab 200 - 50mm ----------------- : 0.14 0.17 0.44 0.59 0.69 0.870 0.77 0.77 0.81 0.720 0.730 0.700 0.720 0.7300 0.760 0.760 0.7900 0.810
Rockwool Marine Slab 200 - 60mm ----------------- : 0.26 0.41 0.65 0.60 0.59 0.660 0.69 0.71 0.74 0.760 0.780 0.830 0.830 0.8500 0.860 0.880 0.9000 0.940
Rockwool Marine Firebatts 100 - 40mm ------------ : 0.13 0.14 0.23 0.29 0.43 0.710 0.85 0.84 0.87 0.850 0.900 0.930 0.900 0.9100 0.890 0.910 0.9000 0.900
Rockwool Marine Firebatts 120 - 75mm ------------ : ----- 0.35 ----- ---- 0.40 ------- ---- 0.55 ----- ----- --0.60-- ----- ----- --0.80-- ------ ----- --0.90-- -----
Rockwool Marine Firebatts 130 - 30mm ------------ : 0.06 0.04 0.12 0.26 0.41 0.580 0.72 0.80 0.82 0.730 0.760 0.730 0.710 0.7300 0.740 0.770 0.7900 0.830
Rockwool Marine Firebatts 130 - 50mm ------------ : 0.17 0.11 0.33 0.58 0.69 0.920 0.84 0.89 0.83 0.810 0.760 0.780 0.740 0.7500 0.800 0.760 0.8300 0.840
Rockwool Marine Firebatts 130 - 60mm ------------ : 0.20 0.31 0.51 0.59 0.69 0.810 0.86 0.85 0.84 0.840 0.880 0.880 0.880 0.8700 0.880 0.900 0.9200 0.930
Rockwool Marine Firebatts 150 - 100mm ----------- : 0.47 0.53 0.67 0.61 0.68 0.780 0.80 0.84 0.85 0.870 0.920 0.930 0.910 0.9200 0.910 0.900 0.9100 0.930
Rockwool Marine Wired Mat 80 - 50mm ------------ : 0.12 0.18 0.35 0.60 0.81 1.010 1.01 0.88 0.90 0.920 0.900 0.850 0.930 0.8200 0.870 0.860 0.8500 0.950
Rockwool Marine Wired Mat 80 - 50mm inc alu foil : 0.23 0.30 0.74 0.56 0.64 0.780 0.84 0.82 0.84 0.800 0.790 0.800 0.800 0.7200 0.700 0.660 0.5700 0.540
Rockwool Marine Wired Mat 80 - 100mm ---------- : 0.42 0.51 0.86 0.87 0.90 1.010 0.97 0.97 0.90 0.950 0.900 0.920 0.960 0.8800 0.850 0.910 0.8800 0.960
Rockwool Marine Wired Mat 80 -100mm inc alu foil: 0.69 0.63 0.69 0.68 0.78 0.860 0.80 0.87 0.85 0.880 0.860 0.820 0.850 0.7900 0.740 0.630 0.5800 0.510
Rockwool Marine Wired Mat 90 - 45mm ----------- : 0.15 0.17 0.37 0.52 0.63 0.820 0.87 0.88 0.89 0.890 0.910 0.950 0.920 0.9000 0.900 0.890 0.8700 0.900
Rockwool Marine Wired Mat 90 - 90mm ----------- : 0.50 0.53 0.74 0.68 0.73 0.860 0.88 0.90 0.93 0.890 0.930 0.990 0.930 0.9300 0.940 0.910 0.8800 0.900
Rockwool Marine Wired Mat 105 - 30mm ---------- : 0.06 0.04 0.14 0.34 0.43 0.730 0.76 0.78 0.82 0.860 0.820 0.830 0.840 0.8100 0.780 0.830 0.8300 0.920
Rockwool Marine Wired Mat 105 - 75mm ---------- : 0.43 0.49 0.71 0.65 0.73 0.840 0.84 0.87 0.86 0.880 0.900 0.920 0.900 0.9000 0.920 0.8800 0.870 0.900
Rockwool Marine Wired Mat 105 - 100mm -------- : 0.56 0.55 0.54 0.54 0.70 0.810 0.81 0.87 0.87 0.880 0.930 0.960 0.930 0.9300 0.920 0.9000 0.920 0.910
Rockwool Lamellmatte 541 - 15mm - inc alu foil - : 0.06 0.02 0.08 0.16 0.29 0.420 0.67 0.84 0.69 0.430 0.320 0.190 0.150 0.1500 0.180 0.2300 0.290 0.310
Rockwool Lamellmatte 541 - 50mm - inc alu foil - : 0.22 0.25 0.64 0.79 0.79 0.610 0.38 0.31 0.34 0.380 0.490 0.550 0.520 0.4700 0.450 0.5100 0.610 0.700
Rockwool Lamellmatte 541 - 100mm - inc alu foil : 0.55 0.49 0.67 0.61 0.56 0.540 0.44 0.60 0.67 0.570 0.510 0.530 0.530 0.4300 0.370 0.3500 0.330 0.280
Rockwool Nettingmatte 80 - 50mm - -------------- : 0.12 0.18 0.35 0.60 0.81 1.010 1.01 0.88 0.90 0.920 0.900 0.850 0.930 0.8200 0.870 0.8600 0.850 0.950
Rockwool Nettingmatte 80 - 100mm --------------- : 0.42 0.51 0.86 0.87 0.90 1.010 0.97 0.97 0.90 0.950 0.900 0.920 0.960 0.8800 0.850 0.9100 0.880 0.960
Rockwool Nettingmatte 105 - 30mm --------------- : 0.06 0.04 0.14 0.34 0.43 0.730 0.76 0.78 0.82 0.860 0.820 0.830 0.840 0.8100 0.780 0.8300 0.830 0.920
Rockwool Nettingmatte 105 - 50mm --------------- : 0.19 0.25 0.67 0.61 0.70 0.780 0.84 0.89 0.83 0.850 0.840 0.830 0.830 0.7400 0.730 0.6500 0.560 0.510
Rockwool Nettingmatte 105 - 100mm ------------- : 0.51 0.56 0.79 0.79 0.83 0.950 0.97 0.93 0.90 0.930 0.960 0.930 0.950 0.8800 0.860 0.8900 0.900 0.900
Rockwool Rockfon Industrial - 50mm -------------- : ----- 0.20 ----- ---- 0.70 ------- ---- 1.00 ----- ----- -1.00-- ----- ------ --1.00-- ------ -------- 1.00- -----
Rockwool Rockfon Industrial - 100mm ------------- : ----- 0.65 ----- ---- 0.85 ------- ---- 1.00 ----- ----- -1.00-- ----- ------ --0.95-- ------ -------- 0.95- -----
Rockwool ProRox WM70 - 50mm - (new 2012) --- : 0.17 0.29 0.46 0.57 0.80 0.890 1.01 1.10 1.08 1.060 1.090 1.050 1.060 1.0900 1.070 1.0500 1.080 1.050
Rockwool ProRox WM80 - 50mm - (new 2012) --- : 0.16 0.38 0.59 0.66 0.85 0.890 1.04 1.05 1.00 1.040 1.070 1.010 1.030 1.0600 1.060 1.0700 1.050 1.040
Rockwool ProRox WM100 - 50mm - (new 2012) -- : 0.16 0.37 0.60 0.64 0.86 0.910 1.01 1.07 1.03 1.020 1.050 1.000 1.010 1.0800 1.070 1.0900 1.070 1.050
Rockwool ProRox WM70 - 100mm - (new 2012) -- : 0.70 0.94 0.96 0.81 0.94 0.980 1.02 1.07 1.01 1.000 1.020 1.050 1.050 1.0800 1.070 1.0900 1.070 1.060
Rockwool ProRox WM80 - 100mm - (new 2012) -- : 0.77 0.90 0.88 0.77 0.89 0.920 0.95 1.00 0.97 1.000 1.050 1.030 1.050 1.0600 1.070 1.0500 1.040 1.050
Rockwool ProRox WM100 - 100mm - (new 2012) - : 0.90 0.92 0.85 0.74 0.84 0.910 0.94 1.02 0.95 1.010 1.040 1.050 1.030 1.0700 1.100 1.0600 1.070 1.070
Glava lydfelleplate 2000 - 25mm ------------------ : ------ 0.05 ----- ---- 0.30 ------- ----- 0.65 ----- ----- -1.00-- ----- ------ --1.00-- ------ -------- 0.95- -----
Glava lydfelleplate 2000 - 50mm ------------------ : ------ 0.15 ----- ---- 0.70 ------- ----- 1.00 ----- ----- -1.00-- ----- ------ --0.95- ------ --------- 0.90- -----
Glava lydfelleplate 2000 - 100mm ----------------- : ------ 0.70 ----- ---- 1.00 ------- ----- 1.00 ----- ----- -1.00-- ----- ------ --1.00-- ------ -------- 0.95- -----

Note: The third and fourth decimal are arbitrary add-ons to insure readability of the table.

The ProRox series is very good. However, it is not on the market in Norway just yet. It will be introduced during 2012, in the "Prosess" category. I was told this is a "European" product - meaning, it is not country-specific. It is for sale in many European countries already. It is interesting to note that it is made for the same duct/ventilation market as OC's 700 series. The noise in these environments are at least some times more bass heavy than usual, maybe the products are designed with this in mind. (I read in a report that dealt with noise issues in small water power plants that the dominating noise in ducts/ventilation is below 250hz, see page 31 in this (Norwegian) PDF: Støy i små vannkraftverk

Rockwool ProRox air flow resistivity: Equal to, or more than 50 kPa*s/m2
(Got this info from Rockwool tech support in Germany).

I got the Rockwool Marine absorption values here (se page 48 to 56): Rockwool Marine & Offshore Acoustic Manual

For the other, see attached measurement PDFs. Note: Lamella Mat = Lamellmatte 541. Wired Mat = Nettingmatte.

Some numbers I don't have publicly available references for, I got them from Rockwool, Isover and Glava by email.

Regarding sound absorption values in general: The European measurement procedures (ISO 354) produces sligthly less impressive data than the American equivalent (ASTM C423), probably in some part due to the dimension difference for the tested material. See these post:
https://www.gearslutz.com/board/7427015-post13.html
https://www.gearslutz.com/board/7428773-post33.html

The ISO 354 standard: ISO 354
The ASTM C 423 standard: ASTM C423



Products with density values:

Glava Lydplate (Isover type glass wool product): 22 kg/m3
Glava Lydplate

Glava Lydfelleplate 2000 (Isover-type glass wool product): Density 35 kg/m3
Glava Lydfelleplate 2000
Glava Lydfelleplate 2000 teknisk godkjenning

Rockwool Lamellmatte 541: Density 30 kg/m3

Rockwool IKI-Batts: Density 60 kg/m3

Rockwool Hardrock Fasadeplate: Dual density; the thick layer is 100 kg/m3, the thin layer is 180 kg/m3.

Density values for Rockwool Marine products: Rockwool Marine and Offshore density values



How to interpret density values:

There is a relationship between density and air flow resistivity, but it is loose, very non-linear. Generally, denser products means higher air flow resistivity, but with the same density, glass wool products will typically have higher air flow resistivity than stone wool products, and there are large variations in the density/flow resistivity correlation within these two main product groups, generated by other factors. A very rough understanding of the relationship between density and air flow resistivity can be derived from density/flow resistivity correlation graphs provided by the manufacturers. I have these numbers from Rockwool, Isover, and from an independent Norwegian construction research institution (Byggforsk):

Air flow resistivity -------------------- : 5 kPa*s/m2 - 10 kPa*s/m2 - 20 kPa*s/m2 - 30 kPa*s/m2 - 40 kPa*s/m2 - 50 kPa*s/m2
Rockwool stone wool products: ------------- : 9-31 kg/m3 ----- 24-49 kg/m3 ----- 36-75 kg/m3 ---- 47-98 kg/m3 ------ 56-120 kg/m3 --- 64 -130 kg/m3
Isover stone wool products: ---------------- : 27-40 kg/m3 --- >50 kg/m3 ---------------------------------------------------------------------------------------
Unspecified Nordic stone wool products --- : ------------------- 32-37 kg/m3 ----- 38-52 kg/m3 ---- 53-65 kg/m3 ----- 70-80 kg/m3 ----- 80-90 kg/m3
Isover glass wool products: ---------------- : 9-18 kg/m3 ----- 15-30 kg/m3 ----- 27-45 kg/m3 ---------------------------------------------------------------
Unspecified Nordic glass wool products --- : ------------------- 13-27 kg/m3 ----- 33-45 kg/m3 ---- 47-58 kg/m3 ----- 65-75 kg/m3 ----- 75-85 kg/m3

Note: The graphs are hard too read with any accuracy, so don't take the numbers too seriously. But if you are interested in this, there are more information in the graphs than in the numbers displayed here. Be aware that when a manufacturer estimates the performance of competing products, it will be portrayed as "bad" as reasonably possible.


Links to graphs:

Rockwool:
Rockwool flow resistivity/density correlation graph
Rockwool Marine & Offshore Acoustic Manual (page 23)

Isover (see page 9):
Isover flow resistivity/density correlation graph

Byggforsk (older, unspecified Nordic insulation products):
Byggforsk flow resistivity/density correlation graph (page 6)


***


If you have some other acoustic data, relevant for Norway, please share.
I have a lot of Rockfon Industrial opal. Is this usefull as basstraps in the corner?

What about Rockwool Lydplate?
Old 12th January 2017
  #27
Lives for gear
 
Bjorn Omholt's Avatar
 

Rockfon industrial and lydplate has too high density/air flow resistivity in order to work well for a bass trap. The better material here depends on the size of the bass trap, but obviously a trap made out of porous material needs to be very large in order to have good effect for the lowest frequencies. Even so, they cannot compete with a pressure based traps below 80 Hz or so.
Old 12th January 2017
  #28
Gear Maniac
 

Quote:
Originally Posted by bokaasen View Post
I have a lot of Rockfon Industrial opal. Is this usefull as basstraps in the corner?

What about Rockwool Lydplate?
Both will help, but the lightest material out of these two will probably perform best in the lowest frequencies.

If you want the best material for thick (= more than 30 cm) bass traps you should buy this:
https://www.byggmax.no/isolasjon/min...on-rull-p16710

It has has a published air flow resistivity of ≥ 5,0 kPa s/m2.
http://www.ursa.pl/pl-pl/produkty/Do...SA_GOLD_35.pdf

Lambda 39 should be equally good though, and could actually be better, this according to Knauf tech support (see post 14 above): https://www.byggmax.no/isolasjon/min...mbda-39-p16505

Both products are very cheap. Good luck.


Torstein Lindaas
Old 12th January 2017
  #29
Lives for gear
 
Deckdaddy's Avatar
I used Knauf. Eco friendly, cheap and good results. Also no nasty catpiss smell.
Old 13th January 2017
  #30
Gear Maniac
Thanks. Nice to meet some Norwegians here

Great products for great prices
Post Reply

Welcome to the Gearslutz Pro Audio Community!

Registration benefits include:
  • The ability to reply to and create new discussions
  • Access to members-only giveaways & competitions
  • Interact with VIP industry experts in our guest Q&As
  • Access to members-only sub forum discussions
  • Access to members-only Chat Room
  • Get INSTANT ACCESS to the world's best private pro audio Classifieds for only USD $20/year
  • Promote your eBay auctions and Reverb.com listings for free
  • Remove this message!
You need an account to post a reply. Create a username and password below and an account will be created and your post entered.


 
 
Slide to join now Processing…
Thread Tools
Search this Thread
Search this Thread:

Advanced Search
Similar Threads
Thread
Thread Starter / Forum
Replies
cppi / Remote Possibilities in Acoustic Music and Location Recording
3
Andres Mayo / Mastering forum
1
Marrone / Rap + Hip Hop engineering and production
28
RANSAN / So much gear, so little time
0

Forum Jump
Forum Jump