Chlorinated Poly Vinyl Chloride pipe joints shall be joined by

Brazing involves melting a filler metal to join two metals together, which is unsuitable for CPVC pipes. This method is typically used for metals and not applicable to plastic materials like CPVC, which require a chemical bonding agent rather than a heat-based joining technique.

Threading is a mechanical joining method used primarily for metal pipes, where threads are cut into the pipe ends for connection. CPVC pipes do not support threading due to their material properties, and this process is not recommended for creating reliable joints in plastic piping systems.

Heat-fused fittings are used for certain types of thermoplastic pipes, such as polyethylene, but they are not suitable for CPVC. The joining of CPVC pipes relies on solvent cement, as heat fusion can damage the integrity of the CPVC material and does not provide the necessary bond.