PVC/NBR Thermal Insulation Pipe/ Thermal Insulation Material 1, strong load bearing, 2, high resistance to acid and alkali PVC/NBR Thermal Insulation Pipe / Thermal Insulation Material features good heat protection, strong load bearing, non-water absorption, high resistance to acid and alkali.Thermal Insulation Pipe Inner Size(mm)Copper Pipe Size(Inch)Iron Pipe (DN)9(N) Size13(T) Size19(NT) ...