StandardASTM C534 Type II (sheet/roll), Grade 1
Thermal conductivity (k)0.25 @ 75°F
Flame / smoke25 / 50 (ASTM E84, through 1" wall)
Water-vapor sorption0.05 perm·in (ASTM E96); water absorption ≤0.2% by vol
Combustibility25/50-rated elastomeric foam (does not meet E136)