Quote:
Originally Posted by Brainchild  Yeah, it's a total bitch. Since you know the materials and ratios of the material (half hemp, half cotton), and you know the total density, if you can research the average fiber diameter of the hemp and cotton fibers, you can calculate the flow resistivity from there. Kind of. To a certain extent. |
The Thermo Hemp which is almost all hemp has resistivity of 6000 Pa-s/m2. Pretty damn good for making very thick stuff. (Someone on this forum made great use of this stuff. Was going to get this myself but there's big delay in new stock)
On the flip side UltraTouch Cotton product , whilst not having gas flow data, seems to perform poorly at lower freq with greater thickness according to their acoustic data.
Perhaps this Isonat hemp/cotton lies somewhere in the middle, but again its pure guesswork which is a bummer :/
I've fired off a couple emails, hopefully I'll get a response back.
*edit* would looking at its thermal performance figures give any additional clues i wonder?