... materials are manufactured without the use of CFC's,HFC's or HCFC's. They are also formaldehyde free, low VOCs, ... mK)0.276(0.040)Water vapor permeabilityPerm-in (kg/m ·s ·pa)0.08(1.16 X 10-13)ASTM ... 52615Flame spread and smoke developed index25/50ASTM E84,CAN/ULC S 102Class 1BS 476 part 7V0UL94Water absorption, by volume%0 ... .7.Installation: NBR/PVC rubber foam heat insulation tube (pipe) for HVAC