It's 10.
I guess the higher value the better.
Tadek
Heuer wrote: ↑Thu Mar 29, 2018 9:52 amKoolmat being an American company use 'R' values for resistance to heat flow, which is the ratio of the temperature difference across an insulator and the heat flux (heat transfer per unit area): https://en.wikipedia.org/wiki/R-value_(insulation)
The standard 'R' value for Koolmat is 1.6. Many companies (e.g. Dynamat) are reluctant to publish figures and very careful not to claim anything about heat insulation properties. You will need to find the R value of Pyrogel to make a comparison.