Piping is normally larger than a tube and is manufactured to a group standard. Pipes can be bought in a range of nominal lengths and diameters whereas tubes are usually custom-made for a particular purpose. In manufacturing industries, pipe and tube constitute two very different materials. The pipe can be made from various materials including ceramic, glass, plastic and concrete. Tube, on the other hand, is made of plastic, rubber or metal alloys such as stainless steel.
In the USA, plastic pipe standards are set by the American Society for Testing and Materials (ASTM). They maintain a list of approved testing laboratories who regularly test for compliance. All manufactured plastic pipe (including CPVC, schd 40) must bear markings that show this pipe conforms to the ASTM standard.
CPVC - CPVC is a thermoplastic made via chlorination of the polyvinyl chloride resin. It is resistant to degradation and provides a long service lifespan. In fact, the first piping systems using CPVC occurred in 1959, and they are still working without a problem.
Like other plastic pipes, CPVC pipe requires a solvent weld cement of a composition that differs from any other plastic pipes. The pipe and the fitting must be prepared using a primer chemical available in plumbing supply stores and hardware stores.
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