pipes and fittings

Sure Union International Ltd. is a supplier of various piping related products as well as sanitary items(include toilet seat and other bathroom accessories). Its business scope includes Pex-Al-Pex Pipe (or multilayer pipe ), pex pipe, PPR pipe, fittings and tools for these pipes, valves, faucets, drainage systems, bathroom shower, woven flexible hoses and other PVC and/or PE hoses.

Thursday, December 30, 2004

The introduction of PEX tubing or pipes

Cross-linked Polyethylene (PEX) is a thermoset material made from medium or high density, cross-linkable polyethylene meeting the requirements of ASTM F876 and F877.
PEX piping has been used in hot and cold water distribution systems and for hydronic radiant heating in Europe for many years. Introduced into the United States in the 1980's, PEX has replaced polybutylene (PB) as the most widely-used flexible plumbing piping.
PEX tubing is manufactured by extrusion in sizes from ?-2" diameter to copper tube size, OD controlled (CTS-OD) dimensions. The wall thickness is based on Standard Dimension Ratio 9 (SDR 9) values. It is available in coils and straight lengths.

PEX tubing can be used in potable water distribution systems provided it has been tested in accordance with the governing standard, meets the requirements of ANSI/NSF Standard 61, and bears proper certification from a recognized testing agency. PEX tubing is also widely used for heat transfer applications - both low-temperature (radiant floor heating, snow melting, and ice rinks), as well as distribution piping for temperatures up to 200 F (hot water baseboard, convectors, radiators, etc.).

PEX tubing is recognized as acceptable for water distribution piping in most model plumbing codes.

PEX tubing is available from plumbing wholesalers, building centers, and manufacturers throughout the U.S.A. and Canada.

PEX tubing must be labeled as follows:
1.The manufacturer's name or trademark
2.The standard to which it conforms (ASTM F876, F877, or both)
3.Tube size and CTS
4.Material designation code (PEX0006)
5.Pressure/temperature rating(s)
If the tubing is for potable water, a laboratory seal or mark attesting to suitability for potable water The marking interval is require to be not more than five feet.


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