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What is Water Absorption of Plastics?

Various polymeric materials are susceptible to water absorption during its life exposure. This may cause dimensional instability with property degradation and ultimately lead to failure. This test was designed to evaluate materials by exposing specimens to water for different time & temperature profiles. Testing is conducted on specimens that are submersed in water and a before & after weight change is documented. Depending on the application of the product, certain levels of moisture are accepted.

Certain materials require small amounts of moisture for ultimate field performance. However, it is generally accepted that the lower the number, the better, especially during molding or extrusion. Most polymers are dried @ 50⁰C in an Air Circulated Oven for 24 hours and re-weighed to the nearest 0.001 gms. High Engineered grades (filled or hi-temp.) may require higher drying profiles, but the time is generally the same.

Specimens: 2" Disks x 1/8" thick. For Sheet materials 3" bars x 1" x thickness of the material.

Should you need additional information about CRT Laboratories' Water Absorption testing capabilities please contact us via our RFQ Form or call us at (714) 283-2032. You may fax a request for a proposal at (714) 283-1365.