PERT will not corrode, pit or develop pinholes over time, and resists the buildup of corrosive materials and minerals that can degrade and clog other types of pipe. PERT pipe is light weight, and is installed significantly faster in both new home construction, and as replacement piping for a home’s existing plumbing. What is it made of? 16mm multilayer pipe made from high-density polyethylene which is durable and flexible when used and can bend at a 90-degree angle. Specification: Tmax: 95°C Pmax: 10 bar EN ISO21003 WRAS Approved thickness of aluminium (mm): 0.25 coefficient of thermal conduction(W/m/K): 0.43 linear expansion coefficient(mm/m/k): 0.025