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Water Absorption - ASTM D570
The percent increase in weight of a material after exposure to water under specified conditions. Water absorption can influence mechanical and electrical properties. Factors such as the type of material, additives, temperature, and length of exposure can affect the amount of water absorbed.
For testing, the specimens are dried and cooled. Three testing procedures are commonly employed. Only data from the same testing procedures are readily comparable.
| Procedure | Test Description |
|---|---|
| Water Absorption @ 24 hrs | Test specimens are immersed in distilled water at a specified temperature for 24 hours. Testing is most commonly done at 23°C (73.4°F) |
| Water Absorption @ Saturation | Test specimens are immersed in distilled water at a specified temperature until the water absorption essentially ceases. |
| Water Absorption @ Equilibrium. | Test specimens are exposed to a humid environment at a specified temperature for 24 hours. Testing is most commonly performed at 50% relative humidity (RH) and 23°C (73.4°F). |