CAUTION! Click
on and read this link first - Usage and chemical cautions.
The following information is provided as a general guide for the
selection of piping systems subjected to various chemical substances.
The recommendations stated are based on information provided by
our raw material suppliers and is believed to be reliable. This
information is based one or more of the following: actual chemical
immersion testing, chemical structure comparison to substances that
have been tested, past field experience, and various other sources.
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It is well known that both PVC and CPVC thermoplastic piping products
are generally immune to most types of corrosion typically experienced
with metallic underground piping systems. The effects of galvanic
and electrochemical corrosion are nonexistent since both of these
materials are non-conductors.
When compared to other piping materials, both PVC and CPVC piping
products also exhibit exceptional chemical resistance to a wide
variety of corrosive reagents and mixtures found in the chemical
processing industries. This fact has been well demonstrated for
over 30 years in numerous chemical-processing applications. In general,
both PVC and CPVC are inert to most mineral acids, bases, salts,
and paraffinic hydrocarbons.
Factors such as percentage of chemical concentration, combinations
of chemical substances, temperature, pressure, external system stress,
and product quality can affect chemical resistance. Although extensive
research has been conducted over the years to better define use
parameters, the possible combinations of chemical mixtures and their
resultant reaction when mixed is endless. Therefore the following
chemical resistance data is by no means complete. The absence of
a specific chemical or solution from the chemical resistance chart
does not imply that Harvel products are not suitable for use with
that substance. When test data on chemical resistance to particular
chemicals under specific operating conditions is not available,
Harvel Plastics, Inc. recommends that chemical immersion testing
be performed, and if successful, a small test assembly be constructed
to test the product under actual use conditions (appropriate care
and safety precautions must be followed with all in-service testing).
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