Plastic PEX fittings are made to withstand high temperatures. They are less susceptible to chemical attacks in acidic environments and poor water quality. When cutting plastic PEX pipes and fittings, consider using a pipe cutting tool other than a hacksaw. Check your local building code in case there are other requirements where you live. In temperate climates, where temperatures reach sub-zero levels, water in the pipes can freeze, causing the pipes to burst. Many consumers wonder whether plastic PEX fittings are good or bad. They have a conductor short-circuit rating of 250 C. Wall and Fittings for Radiant Heating Systems up to 75 psig, F645-18b Standard Guide for Selection, Design, and Installation of Thermoplastic Water- Pressure Piping Systems, F2855-19 Standard Specification for Chlorinated Poly(Vinyl Chloride)/Aluminum/Chlorinated Poly(Vinyl Chloride) (CPVC-AL-CPVC) Composite Pressure Tubing, D2846/D2846M-19a Standard Specification for Chlorinated Poly(Vinyl Chloride) (CPVC) Plastic Hot- and Cold-Water Distribution Systems, D2774-21a Standard Practice for Underground Installation of Thermoplastic Pressure Piping, D1527-99(2005) Standard Specification for Acrylonitrile-Butadiene-Styrene (ABS) Plastic Pipe, Schedules 40 and 80 (Withdrawn 2014), D3309-96a(2002) Standard Specification for Polybutylene (PB) Plastic Hot- and Cold-Water Distribution Systems (Withdrawn 2010), D2282-99(2005) Standard Specification for Acrylonitrile-Butadiene-Styrene (ABS) Plastic Pipe (Withdrawn 2007), F771-99(2005) Standard Specification for Polyethylene (PE) Thermoplastic High-Pressure Irrigation Pipeline Systems (Withdrawn 2014), F690-86(2003)e2 Standard Practice for Underground Installation of Thermoplastic Pressure Piping Irrigation Systems (Withdrawn 2012), F1176-01e1 Standard Practice for Design and Installation of Underground Thermoplastic Irrigation Systems With Maximum Working Pressure of 125 psi (Withdrawn 2010), F1380-95a(2002)e1 Standard Specification for Metal Insert Fittings for Polybutylene (PB) Tubing (Withdrawn 2008), F2969-12(2020) Standard Specification for Acrylonitrile-Butadiene-Styrene (ABS) IPS Dimensioned Pressure Pipe, F480-14(2022) Standard Specification for Thermoplastic Well Casing Pipe and Couplings Made in Standard Dimension Ratios (SDR), SCH 40 and SCH 80, F1668-16(2022) Standard Guide for Construction Procedures for Buried Plastic Pipe, F878-95 Specification for Polybutylene (PB) Thermoplastic Thin-Wall Drip Irrigation Tubing (Withdrawn 2000), F877-23 Standard Specification for Crosslinked Polyethylene (PEX) Hot- and Cold-Water Distribution Systems, F2389-23 Standard Specification for Pressure-rated Polypropylene (PP) Piping Systems, F2806-23 Standard Specification for Acrylonitrile-Butadiene-Styrene (ABS) Plastic Pipe (Metric SDR-PR), F3253-23 Standard Specification for Crosslinked Polyethylene (PEX) Tubing with Oxygen Barrier for Hot- and Cold-Water Hydronic Distribution Systems. However, after a significant amount of stress, the pipe may experience a leak, especially at a connection point.

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