Product Description Polyethylene pipe insulation ideal for thermal insulation of pipe work in domestic environments. Polyethylene pipe insulation (Class P Fire Rating) Totally CFC & HCFC free Hygenic product; rot proof, odourless and non hydroscopic. Will not sustain vermin and will not encourage growth of fungi or mould. Global Warming Potential (GWP) specified by the International Panel on Climate Change requires a reading of less than 5. Climaflex has a reading of zero.