Forman Building Systems Preformed Pipe Sections are manufactured from non-combustible glass fibres bonded with a thermosetting resin into cylindrical insulation sections. A slit along one wall allows the pipe section to be opened and installed over the pipe. The Preformed Pipe Sections are a highly efficient thermal insulation product for use on pipes operating in the temperature range 2°C to 450°C. They are designed for use on chilled water, hot water, steam and other service lines in commercial and institutional projects, as well as industrial process and steam lines. Inorganic fibres will not cause or accelerate the corrosion of any metal. Cannot act as a catalyst for stress corrosion cracking of stainless steel unless wet by solutions containing chloride.