Aquatherm’s 4” Blue Pipe SDR 17.6 faser-composite is an alternative to steel and copper pipe and is noncorrosive, nontoxic, does not contain phthalates or BPA, is lead-free and chemically inert. Additionally, Aquatherm polypropylene pipe has a low friction factor and is fully recyclable. The SDR 17.6 pipe delivers roughly a 20% higher flow volume than SDR 11 at a lower cost and reduces pipe weight by 35%. The faser-composite layer allows the pipe to remain rigid at higher temperatures, and helps to limit expansion and contraction.