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Air flow resistivity for Isover Sweden Desktop Synthesizers
Old 27th January 2012
  #1
Gear Maniac
 

Thread Starter
Air flow resistivity for Isover Sweden

With the exception of the Marine products, the air flow resistivity numbers here are calculated, not measured, which mean they are more approximate than usual. The basis of the calculations are certain production parameters, and the calculations were done by a research engineer at Isover Sweden, which emailed the results to me.

Note: Some products are declared with a range of densities. When the engineer calculated the numbers, she used the lowest density in the range as one of the many parameters in the flow resistivity calculation.

Terminology: Air Flow Resistivity (in swedish: luftflödesmotstånd) 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.

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


Products with density and air flow resistivity data:

Isover Piano Ljudskiva
Density: 13-15 kg/m3
Air Flow Resistivity: 7 kPa*s/m2
http://www.isover.se/produkter/produktvisning?id=20785
http://www.isover.se/produkter/produktvisning?id=20984
http://www.isover.se/produkter/produktvisning?id=20787

Note: This product is declared with an air flow resistivity of 6 kPa*s/m2 (on the web page). According to the measurement and publication standard EN 13162 (used by Isover) 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

So, 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.

Isover Cleantec Plus
Density: 35 kg/m3
Air Flow Resistivity: 7 kPa*s/m2
http://www.isover.se/installationer/...sover+cleantec

Isover ULTIMATE Piano
Density: 13-15kg/m3
Air Flow Resistivity: 10 kPa*s/m2 (declared 9)
http://www.isover.se/produkter/produktvisning?id=21062
http://www.isover.se/produkter/produktvisning?id=21067

Note: When a product comes in both a "normal" and an "ultimate" version, the ultimate version have somewhat higher air flow resistivity than the normal version, even though the products have the same density.

Isover Cleantec G35
Density: 35 kg/m3
Air Flow Resistivity: 12 kPa*s/m2
http://www.isover.se/installationer/...sover+cleantec

Note: See good bass absorption data for its sister product G100 at page 15 here:
http://www.isover.se/files/Isover_SE...onskanaler.pdf

Isover U Marine Roll MFN
Density: 24 kg/m3
Air Flow Resistivity: Equal to, or more than 12 kPa*s/m2
http://www.isover.se/produkter/produktvisning?id=22668
http://www.isover-technical-insulati...e85fd2dc6f.pdf

Isover U Marine Roll MFA
Density: 24 kg/m3
Air Flow Resistivity: Equal to, or more than 12 kPa*s/m2
http://www.isover.se/produkter/produktvisning?id=22724
http://www.isover-technical-insulati...e85fd2dc6f.pdf

Isover U Marine Slab MPG
Density: 24 kg/m3
Air Flow Resistivity: Equal to, or more than 12 kPa*s/m2
http://www.isover.se/produkter/produktvisning?id=22743
http://www.isover-technical-insulati...ac280a8426.pdf

Isover Stålregelskiva 36
Density: 16-19 kg/m3
Air Flow Resistivity: 13 kPa*s/m2
http://www.isover.se/produkter/produktvisning?id=20945
http://www.isover.se/produkter/produktvisning?id=20773
http://www.isover.se/produkter/produktvisning?id=20770
http://www.isover.se/produkter/produktvisning?id=20871
http://www.isover.se/produkter/produktvisning?id=20971

Isover Träregelskiva 36
Density: 16-19 kg/m3
Air Flow Resistivity: 13 kPa*s/m2
http://www.isover.se/produkter/produktvisning?id=20772
http://www.isover.se/produkter/produktvisning?id=20776
http://www.isover.se/produkter/produktvisning?id=21465

Isover UNI-skiva 36
Density: 16-19 kg/m3
Air Flow Resistivity: 13 kPa*s/m2
http://www.isover.se/produkter/produktvisning?id=20778

Isover U Marine Roll MFV
Density: 36 kg/m3
Air Flow Resistivity: Equal to, or more than 15 kPa*s/m2
http://www.isover.se/produkter/produktvisning?id=22727
http://www.isover-technical-insulati...e85fd2dc6f.pdf

Isover U Marine Slab MPN
Density: 36 kg/m3
Air Flow Resistivity: Equal to, or more than 16 kPa*s/m2
http://www.isover.se/produkter/produktvisning?id=22697
http://www.isover-technical-insulati...ac280a8426.pdf

Isover UNI-skiva 33
Density: 20-35 kg/m3
Air Flow Resistivity: 18 kPa*s/m2
http://www.isover.se/produkter/produktvisning?id=20841

Isover U Marine Slab MPA
Density: 48 kg/m3
Air Flow Resistivity: Equal to, or more than 25 kPa*s/m2
http://www.isover.se/produkter/produktvisning?id=22740
http://www.isover-technical-insulati...ac280a8426.pdf

Isover U Marine Wired Mat 66 Alu1
Density: 66 kg/m3
Air Flow Resistivity: Equal to, or more than 48 kPa*s/m2
http://www.isover.se/produkter/produktvisning?id=22687
http://www.isover-technical-insulati...38872db51f.pdf

Isover U Marine Wired Mat 66 N
Density: 66 kg/m3
Air Flow Resistivity: Equal to, or more than 48 kPa*s/m2
http://www.isover.se/produkter/produktvisning?id=22685
http://www.isover-technical-insulati...38872db51f.pdf

Isover Fasadskiva 31
Density: 50-60 kg/m3
Air Flow Resistivity: 55 kPa*s/m2
http://www.isover.se/produkter/produktvisning?id=21008
http://www.isover-technical-insulati...ac280a8426.pdf



Products with density values:

Isover Light Träregelskiva 39
Density: 13-15 kg/m3
http://www.isover.se/produkter/produktvisning?id=20943

Isover Bjälklagsskiva P 36
Density: 16-19 kg/m3
http://www.isover.se/produkter/produktvisning?id=20774

Isover ULTIMATE UNI-skiva 37
Density: 16-19 kg/m3
http://www.isover.se/produkter/produktvisning?id=20780

Isover ULTIMATE Stålregelskiva 37
Density: 16-19 kg/m3
http://www.isover.se/produkter/produktvisning?id=21050

Isover ULTIMATE Träregelskiva 37
Density: 16-19 kg/m3
http://www.isover.se/produkter/produktvisning?id=21021

Isover Duo 33
Density: 20-35 kg/m3
http://www.isover.se/produkter/produktvisning?id=20817

Isover Installationsskiva 33
Density: 20-35 kg/m3
http://www.isover.se/produkter/produktvisning?id=21019

Isover Skalmursskiva 33
Density: 20-35 kg/m3
http://www.isover.se/produkter/produktvisning?id=22547

Isover Stålregelskiva 33
Density: 20-35 kg/m3
http://www.isover.se/produkter/produktvisning?id=20958

Isover Träregelskiva 33
Density: 20-35 kg/m3
http://www.isover.se/produkter/produktvisning?id=20930

Isover Fasadboard 33
Density: 120-125 kg/m3
http://www.isover.se/produkter/produktvisning?id=20764




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

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


***

If you have other acoustic data, relevant for Sweden, please share.
Old 27th January 2012
  #2
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Old 27th January 2012
  #3
Gear Maniac
 

Thread Starter
How do you use the table?
Old 27th January 2012
  #4
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Quote:
Originally Posted by tlindaas View Post
How do you use the table?
Source the “air permeability” value for the product and convert to kPa*s/m² using the table.
Old 27th January 2012
  #5
Gear Maniac
 

Thread Starter
Can't find any air permeability info on their web page. Probably have to talk to them..
Old 27th January 2012
  #6
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Quote:
Originally Posted by tlindaas View Post
Can't find any air permeability info on their web page. Probably have to talk to them..
"Luftgenomsläpplighet":

default

Old 27th January 2012
  #7
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Quote:
Originally Posted by Jens Eklund View Post
Now that’s what I call a quality post!
+1

not relevant to me but great effort!
Old 27th January 2012
  #8
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avare's Avatar
 

Marvelous!

Andre
Old 27th January 2012
  #9
Gear Maniac
 

Thread Starter
Quote:
Originally Posted by Jens Eklund View Post
"Luftgenomsläpplighet":
Thanks. With that magic word I googled my way to the relevant info. Here are the numbers, converted to air flow resistivity:

PAROC UNS 39z
Luftgenomsläpplighet 200 10-6 m2/sPa - converted to air flow resistivity 5 kPa*s/m2
http://192.49.230.181/CSharpSite/ext...SE&public=true
http://www.stenull.paroc.se/produktd...llanvaggar.pdf

PAROC UNS 37z
Luftgenomsläpplighet 130 10-6 m2/sPa - converted to air flow resistivity approximately 8 kPa*s/m2
http://192.49.230.181/CSharpSite/ext...SE&public=true
http://www.stenull.paroc.se/produktd...llanvaggar.pdf

PAROC FPS 14
Luftgenomsläpplighet 50 x 10-6 m3/m²sPa - converted to air flow resistivity 20 kPa*s/m2
http://192.49.230.181/CSharpSite/ext...SE&public=true

PAROC WAS 50 Skalmursskiva
Luftgenomsläpplighet 50 10-6 m2/sPa - converted to air flow resistivity 20 kPa*s/m2
http://www.stenull.paroc.se/produktd...oljud_WB09.pdf

PAROC PreCast
Luftgenomsläpplighet 45 x 10-6 m3/m²sPa - converted to air flow resistivity 22 kPa*s/m2
http://192.49.230.181/CSharpSite/ext...SE&public=true

PAROC ROS 20
Luftgenomsläpplighet 40 x 10-6 m3/m²sPa - converted to air flow resistivity 25 kPa*s/m2
http://192.49.230.181/CSharpSite/ext...SE&public=true

Paroc WAS 35tt
Luftgenomsläpplighet 25 10-6 m2/sPa - converted to air flow resistivity approximately 28 kPa*s/m2
http://192.49.230.181/CSharpSite/ext...SE&public=true

PAROC ROX 2
Luftgenomsläpplighet 36 x 10-6 m3/m²sPa - converted to air flow resistivity 28 kPa*s/m2
http://192.49.230.181/CSharpSite/ext...SE&public=true

PAROC GRS 30
Luftgenomsläpplighet 35 10-6 m2/sPa - converted to air flow resistivity 28.6 kPa*s/m2
http://192.49.230.181/CSharpSite/ext...SE&public=true

PAROC ROS 30
Luftgenomsläpplighet 30 x 10-6 m3/m²sPa - converted to air flow resistivity 33 kPa*s/m2
http://192.49.230.181/CSharpSite/ext...SE&public=true

Paroc Rou 60 5
Luftgenomsläpplighet 25 x 10-6 m3/m²sPa - converted to air flow resistivity 40 kPa*s/m2
http://192.49.230.181/CSharpSite/ext...SE&public=true

PAROC WAS 25t
Luftgenomsläpplighet 25 10-6 m2/sPa - converted to air flow resistivity 40 kPa*s/m2
http://192.49.230.181/CSharpSite/ext...SE&public=true

PAROC ROB 60
Luftgenomsläpplighet 15 x 10-6 m3/m²sPa - converted to air flow resistivity 67 kPa*s/m2
http://192.49.230.181/CSharpSite/ext...SE&public=true

PAROC ROB 80
Luftgenomsläpplighet 15 x 10-6 m3/m²sPa - converted to air flow resistivity 67 kPa*s/m2
http://192.49.230.181/CSharpSite/ext...SE&public=true

PAROC ROS 50
Luftgenomsläpplighet 15 x 10-6 m3/m²sPa - converted to air flow resistivity 67 kPa*s/m2
http://192.49.230.181/CSharpSite/ext...SE&public=true

PAROC ROS 60
Luftgenomsläpplighet 15 x 10-6 m3/m²sPa - converted to air flow resistivity 67 kPa*s/m2
http://192.49.230.181/CSharpSite/ext...SE&public=true

PAROC ROU 60 4
Luftgenomsläpplighet 25 x 10-6 m3/m²sPa - converted to air flow resistivity 40 kPa*s/m2
http://192.49.230.181/CSharpSite/ext...SE&public=true

PAROC ROV 60 1
Luftgenomsläpplighet 15 x 10-6 m3/m²sPa - converted to air flow resistivity 67 kPa*s/m2
http://192.49.230.181/CSharpSite/ext...SE&public=true

PAROC ROV 60 2
Luftgenomsläpplighet 15 x 10-6 m3/m²sPa - converted to air flow resistivity 67 kPa*s/m2
http://192.49.230.181/CSharpSite/ext...SE&public=true

PAROC Cortex
Luftgenomsläpplighet equal to, or more than 10-6 m2/sPa - converted to air flow resistivity equal to or less than 100 kPa*s/m2
http://192.49.230.181/CSharpSite/ext...SE&public=true

PAROC FAS 2 (Putsskiva 385-00)
Luftgenomsläpplighet < 0,09 m3/m h Pa - this one I don't understand
http://www.stenull.paroc.se/produktd..._2002_WB09.pdf
Old 27th January 2012
  #10
Gear Addict
 

Bäste Hr Lindås,
Det där var ju inte så jäkla skituschlig info att få reda på.

Or, in English: Great info!
Old 27th January 2012
  #11
Gear Maniac
 
cborg's Avatar
 

Quote:
Originally Posted by Adhoc View Post
Bäste Hr Lindås,
Det där var ju inte så jäkla skituschlig info att få reda på.

Or, in English: Great info!
+1!
Old 2nd February 2012
  #12
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SörenHjalmarsson's Avatar
 

+2
Old 6th February 2012
  #13
Gear Head
 
Christopherus's Avatar
 

thanks!

Tusen tack!!!
Old 17th February 2012
  #14
Gear Head
 

TACK!!
Old 19th February 2012
  #15
Gear Head
 
HenrikDuende's Avatar
 

schyrre
Old 28th February 2012
  #16
Gear nut
 

Old 28th February 2012
  #17
Gear nut
 

Old 28th February 2012
  #18
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Jens Eklund's Avatar
Quote:
Originally Posted by Kaleido View Post
I haven't really understand yet tho... is it better to have high or low Air Flow Resistivity?
It depends on the thickness of the panel.

Porous Absorber Calculator V1.59
Old 28th February 2012
  #19
Gear Maniac
 

Thread Starter
Quote:
Originally Posted by Kaleido View Post
I haven't really understand yet tho... is it better to have high or low Air Flow Resistivity?
It depends on the thickness of the panel, and the frequencies that makes problems in your room, and the frequencies you are interested in recording.

You have to decide how thick you can go. The thicker, the better, sound quality wise. If you go thick (above say 25 cm), you generally want low air flow resistivity. If you go thin (5-10 cm), you generally want high air flow resistivity.

To find the frequencies that are problematic in your room, you have to calculate the room modes (the room's natural frequency boosts), or measure the room (measuring is the better, more accurate approach here). Free room mode calculator: http://www.bobgolds.com/Mode/RoomModes.htm

Then you have to decide which frequencies are relevant for your your recording. If you record bass in standard tuning, and bass drum, you want to control frequencies down to roughly 40hz. Guitars (in standard tuning), bass voice go down to ca. 80 hz. More instruments/voices here: The Hz's and dB's in Music - Mik Fielding

When you must choose between different types of insulation, there is often a conflict between the type that work good in the low mids area and the type that work good in the bass area. This is an effect of different air flow resistivities.

In addition to Jens' suggestion (which you'll need Excel to use), there is a free online calculator for air flow resistivity here: Porous Absorber Calculator

You can mostly use the default settings, but choose Miki (recommended by the developer) and random incidence, then type in thickness in millimeters, and 7000 Pa.s/m2 for Absorber 1, then 13000 Pa.s/m2 for Absorber 2. You'll have a name for the resulting graphs if you fill in the "Legend" fields.

Experiment until you reach a satisfying compromise. The higher the blue or green line gets, the more absorption you get, in that particular frequency area.
Old 23rd April 2013
  #20
Gear Maniac
 

Thread Starter
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.

Knauf products for the pro market has higher densities, because of stiffness requirements.

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.

Knauf: Gör Det Själv - Isolering

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 for Isover Sweden-knauf_air_flow_resistivity.png  
Old 25th April 2013
  #21
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Jens Eklund's Avatar
Good info tlindaas, thank you.
Old 25th June 2013
  #22
Gear Head
 

Thank You for this tlindaas! If the Space Slab 039 indeed is lower than that 5k, the better for me. Appears to be the same package for all 4 countries. Don´t know where it´s made in, the only address is in UK. Knauf only produces gypsum boards in Finland.

BTW: Does this EU regulation mean, the companies producing these are required to measure the air flow resistivity? And publish?

Last edited by Strand-old-man; 25th June 2013 at 04:35 PM.. Reason: Apropå
Old 29th January 2014
  #23
Gear Head
 

Paroc eXtra

I would like to add here

PAROC eXtra (A-plate, etc)
Available from Maxbo in Norway at various thicknesses, e.g. 100mm

120 x 10^6 m3/m2.s.Pa (source: Page 2 of this file)
Converted to 8325 rayl = 8325 Pa*s/m2 = 8.325 kPa*s/m2 (using the Paroc table referenced above.)
Old 27th October 2015
  #24
Gear Nut
 

Old thread but... I just bought a pack of Knauf Space slab. But I was surprised that it was not rigid, but soft and loose. 95 mm thick. Did I get the wrong product? (Going to use it for acuostic broad band panels in frames covered in cloth)
Old 27th October 2015
  #25
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Jens Eklund's Avatar
Most suitable wool (suitable GRF) for acoustic treatment (assuming not very thin panels) is not rigid. If the wool you got is good for your intended purpose depends on the total depth you plan to go for:

Multi-layer Absorber Calculator
Old 7th January 2017
  #26
pfg
Gear Nut
 
pfg's Avatar
 

Germany is near sweeden.
Isover products with air-flow-resistivity information:
http://www.isover.at/technik-service...wnload&id=3511

Their products vary from 5000 to 15000 Pa.s/m2 which seems to be enough for absorbing low frequencies when proper depth is used.

Other EU contries: URSA offers cheap insulation as well (5 times cheaper than Isover). Most products have >5000 Pa.s/m2, one or two have 13.000 Pa.s/m2.
http://www.ursa.de/de-de/produkte/ur...che-daten.aspx
http://www.ursa.com/en-us/ursa-world...worldwide.aspx
Old 24th January 2017
  #27
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I´m planning to get some Knauf Ecose slabs from GIK in Germany but shipping is pricey. Need to order for like €1200 to get free shipping!
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