Vacuum Water Absorption - ASTM D1056

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The percent increase in weight of a closed cell foam material after exposure to water under specified conditions.

This test provides an indirect measurement of cell structure and closed cell content of a specimen.

Testing is performed by submerging a specimen in water in a pressure vessel and lowering the air pressure to 2.5 psi absolute for 3 minutes. The vacuum is then removed and the specimen is allowed to rest for another 3 minutes before being removed from the water, blotted dry, and weighed.

Water absorption is calculated using:
W = [(A-B)/B] x 100
where:
W = Change in mass, %
A = Final mass
B = Initial mass