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MOISTURE RETARDERS
Polykraft & Polysurlyn
BELOW ARE DEFINITIONS ACCORDING TO THE ASTM C1729 STANDARDS FOR
ALUMINUM JACKETING FOR INSULATION


MOISTURE RETARDER (also known as moister barrier): layer of plastic film or other material
applied to the inner side of metal jacketing to inhibit jacket corrosion by interfering with the
formation of a galvanic cell between the dissimilar metal of the pipe and jacket or by preventing crevice corrosion.
POLYKRAFT: multilayer composite film used as a moisture retarder on metal jacketing consisting of at least one layer of minimum 40 LB kraft paper and one or more layers of plastic film, usually polyethylene at a minimum thickness of 1.5 mils.

POLYSURLYN: a multilayer film used as a moisture retarder on metal jacketing
consisting of at least one layer of acid copolymer, surlyn and one or more layers of
other polymers, usually polyethylene.

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The above moisture retarders can be applied to aluminum, stainless, AZ 60 galvalume, galvanized and aluminized steel. The intended purpose of applying a moisture retarder is to provide
additional protection and prevent the migration of moisture to the metal. It acts as a mechanical, moisture and electrical barrier between the insulation and the metal to help prevent corrosion of the interior surface to the metal jacketing.






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