Chalk mark MTD-2 TS 5743-020-05346453-2008.
Mass fraction of calcium carbonate and magnesium carbonate in terms of the equivalent amount of calcium carbonate is not less than 96 %. 
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Hydrophobic chalk, mark MT-90T, TS -08.11.30-009-02131099-2018, is packed in 30-kg paper or propylene bags. Hydrophobicity of chalk is at least 95%. Mass fraction of calcium carbonate and magnesium carbonate in terms of the equivalent amount of calcium carbonate is not less than 98.5 %.  
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Hydrophobic Chalk mark MPGM TS 5743-020-05346453-2008.
Hydrophobic chalk is packed in 30-kg paper or propylene bags.
Mass fraction of calcium carbonate and magnesium carbonate in terms of the equivalent amount of calcium carbonate is not less than 94.5 %.  
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Hydrophobic Chalk mark MPGS TS 5743-020-05346453-2008.
Hydrophobic chalk is packed in 30-kg paper or propylene bags. 
Mass fraction of calcium carbonate and magnesium carbonate in terms of the equivalent amount of calcium carbonate is not less than 96.3 %.
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Microcalcite (ground marble) of different fractions is one of the most popular materials in the sector of industry and building construction.
Microcalcite has a calcium carbonate content of at least 98.5 %, microcalcite whiteness is of at least 96%.
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