These Forgefix Pipe Clips are made from heat resistant polypropylene designed to withstand the temperature changes in most central heating systems They are effective with temperatures of up to 100°C They each come complete with a hardened masonry nail which is easy to fix and durable APPLICATION Used when fitting most types of pipe work Ensure when fitting that goggles are used 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