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GSA-331A 3.970in (100.8mm) Porous Stone, 0.5in Thick (12.7mm) is placed at the top or bottom of soil specimens during consolidation testing to allow free flow of fluids through the sample under load. The sturdy stone is made of porous aluminum oxide. GSA-331A porous stones are also used with the HM-562 Expansion Index Consolidometer to provide support at the top and bottom of the soil specimen in testing.
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