... easy installation 3.Low thermal conductivity 4.used for HVAC 1.Overview: All Kingflex elastomeric rubber foam insulations are engineered ... : 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 diameterin(mm)1/4 ... products have passed the certifucation BS 476 CLASS 0 & CLASS 1 OF UK, UL 94, AND ASTM E84 OF USA . ...