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after drying shirink gypsum

Aug 02, 2014· Most thingsshrinkwhen theydry, simply because the material shrinks to fill in the space where the water was. The reason plaster expands is that it forms crystals as it dries, and the crystal structure takes up more space. It is similar to the reason water expands when it freezes, since the water also crystallizes as it turns into ice

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