Reinforced thermosetting resin pipe
(RTRP) is a composite largely consisting of a reinforcement imbedded
in, or surrounded by, cured thermosetting resin. Included in its
composition may be granular or platelet fillers, thixotropic agents,
pigments, or dyes.
The most frequently used reinforcement
is fiberglass, in any one or a combination of the following forms:
continuous filament, chopped fibers, and mats.While reinforcements
such as asbestos or other mineral fibers are sometimes used,
fiberglass-reinforced pipe (FRP) is by far the most popular.
One form of FRP, called reinforced
plastic mortar pipe (RPMP), consists of a composite of layers of
thermosetting resin–sand aggregate mixtures that are sandwiched by
layers of resin-fiberglass reinforcements.
In another construction, the sand is
replaced by glass microspheres.The high content of reinforcements in
RTRP, which may run from 25 to 75 percent of the total pipe weight,
and the specific design of the composite wall construction are the
major determinants of the ultimate mechanical properties of the pipe.
The resin, although also influencing
these properties somewhat, is the binder that holds the composite
structure together, and it supplies the basic source of temperature
and chemical resistance. Glass fibers, as well as many other
reinforcements, do not have high resistance to chemical attack.
For enhanced chemical and/or abrasion
resistance, RTRP construction may include a liner consisting of
plastic (thermosetting or thermoplastic), ceramic, or other material.
The outer surface of the pipe—especially that of the larger
diameter sizes—may also be made “resin rich” to better resist
weathering, handling, and spills.
Reinforced thermosetting resin pipe is
available in a variety of resins, wall constructions, and liners with
diameters ranging from 1 in (2.5 cm) to more than 16 ft (5 m). Stock
and specially fabricated fittings are readily available.
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