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.
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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