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Polybutylene (PB)

This is the only flexible plastic tubing suitable for use with hot and cold water in pressure systems.

It is generally not considered to be pipe, but rather a supply fitting. PB has excellent chemical resistance to acids and alkalis, but is not suited for fuel oil, gasoline or kerosene distribution systems.

Polybutylene can be joined with heat fusion, flare or compression fittings. However, it is not solvent weldable. Manufacturers of PB claim that this tubing will not rupture if water freezes inside. However, some fittings used with PB will break under ice expansion.

This pipe is suitable for both hot and cold water lines. Local plumbing codes should be consulted before installing this type of tubing.

See Also:

Other:
    ASTM Reference Library (material and manufacturing specifications)

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