High purity calcite is essential in the manufacture of glass, be it flat glass panels for window lights or glass bottles for liquid packaging.  Columbia River Carbonates manufactures Micronatex GS at Woodland, WA for the local glass industry from our high purity limestone sources in the Pacific Northwest.  Our quality is backed up by our laboratory, which is equipped with state-of-the art test instruments that are used to certify, among other things, the level of iron and other chemicals that can be undesirable in the production of certain types of glass.

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Quality Testing PDF

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