... vapor permeability perm-in (kg/m·s·pa)0.08 (1.16×10-13)ASTM E96 Procedure A DIN 52615Flame spread and ... or distortion-Wall thickness (normal) in (mm)1/4", 3/8", 1/2", 3/4", 1", 1-1/4", 1-1/2", 2" (6, 9, 13, 19 ... , 25, 32, 40, 50)-Inside diameter, tubular formin (mm)1/4" ID ...