... . They are also formaldehyde free, low VOCS, fiber free, dust free and resistant to mold and mildew.Features:1. Low and stable Thermal conductivity2. High moisture&water ... Class0 and class 1Rubber Insulation Tube's sepecification: 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" ID to 6" IPS(6 ID to ...