Water Absorption 24 Hour/Equilibrium
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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 23°C 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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