Mold resistant AP/Armaflex Pipe (Tube) Insulation is a flexible elastomeric thermal insulation, black in color, supplied as unslit tubing, in:* nominal wall thicknesses of 3/8", 1/2", 3/4", 1" and 1-1/2" (10, 13, 19, 25 and 38mm)* popular sizes up to 6" IPS.The expanded closed-cell structure of AP/Armaflex Pipe Insulation makes it an efficient insulation. It is manufactured without the use of CFC's, HFC's or HCFC's. It is also formaldehyde free, low VOCs, fiber free, dust free and resists mold and mildew. All AP Armaflex products are made with Microban antimicrobial product protection for added defense against mold on the insulation.