Plastics Technology Laboratories  
 

Water Absorption 24 Hour/Equilibrium

ASTM D570

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Scope:
Water absorption is used to determine the amount of water absorbed under specified conditions. Factors affecting water absorption include: type of plastic, additives used, temperature and length of exposure. The data sheds light on the performance of the materials in water or humid environments.

Test Procedure:
For the water absorption test, the specimens are dried in an oven for a specified time and temperature and then placed in a desiccator to cool. Immediately upon cooling, the specimens are weighed. The material is then emerged in water at agreed upon conditions, often 23C for 24 hours or until equilibrium. Specimens are removed, patted dry with a lint free cloth, and weighed.

Specimen size:
Two inch diameter disks, 0.125" or 0.250" thick.

Data:
Water absorption is expressed as increase in weight percent.
Percent Water Absorption = [(Wet weight - Dry weight)/ Dry weight] x 100

Equipment Used:
Mettler balance



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**Please note that this test description is intentionally generic in nature and aimed at providing a descriptive summary to enhance test understanding. For more information please contact a Intertek PTL Technical Representative at . Due to copyright restrictions, we are not able to provide copies of standards. Standards can be obtained from appropriate standards authorities.

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