These Forgefix Pipe Collars are made from heat-resistant polypropylene which is able to withstand the temperature changes in most central heating systems APPLICATION Low cost decorative cover to hide the hole where a pipe passes through a wall floor or ceiling Polypropylene also known as polypropene is a thermoplastic polymer used in a wide variety of applications An addition polymer made from the monomer propylene it is rugged and unusually resistant to many chemical solvents bases and acids It can withstand temperatures of up to 100°C most pipes in domestic central heating systems operate at around 70°C Pipe Collar 15mm Box 25