Water Absorption of Core Materials (ASTM C272)
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ASTM C272
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Scope:
The test method is for structural core materials such as honeycomb or foam and covers the determination of water absorption when immersed or in high relative humidity environments. ASTM C272 outlines three methods: Method A for 24 hour immersion; Test Method B for Elevated Temperature Humidity; and Test Method C for Maximum Percent Weight Gain.
Test Procedure:
At least five 3.0 inch x 3.0 inch test specimens are machined from customer supplied product. The specimens are then dried, removed from the drying oven, and allowed to cool in a desiccator. The specimens are then weighed on an analytical balance to the nearest 0.1mg. The specimens are then immersed in deionized water or placed in the appropriate conditioning environment. The specimens are removed from the conditioning environment after 24 hours, 48 hours, or after thirty days, depending on the conditioning required.
Specimen size:
Three inch by three inch by 0.5 inch thickness.
Data:
The increase in mass is calculated as follows:
Increase in Weight, % = (W – D) / D * 100
W = wet weight
D = dry weight
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