Because of their noncombustibility, silicate and magnesium oxycements are desirable for sealing shale in underground coal mines. In this Bureau of Mines investigation, cement samples were cured and tested (nonstandard tests) for submersion to note resistance to dissolution (breaking into parts), which is an important property for a coating. Nonappreciable dissolution during 1 week of submersion was set for passing the test. Over half of the coatings passed the test.
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