The Micro Calcite (Micromramor, Marble Ground)

The micro-calcite — is a powdery substance. Different from the sand finer grinding. Usually has a white, gray or yellow. It is mined in marble quarries by grinding marble to a fraction of 1 to 500 micrometers. it is divided into fractions by grain size classification.

The physical and chemical characteristics of micro-calcite

CaCO3 — 95-98%

MgO — no more than 0.3%

SiO2 — not more than 0.2%

FeO3 — not more than 0.1%

Volatile substances — not more than 0.2%

Substances insoluble in hydrochloric acid — no more than 0.3%

Substances soluble in water — 0,3%

pH in aqueous suspension — 6,5-7

Hardness on the Mohs scale — 3

Density — 2.6 g/cm3

White — 95-98%

The refractive index is 1.5

Oil absorption between 22 and 30 g/100g

Bulk weight — 0.6-1.3 g/cm3

Humidity — 0,2-0,3%