Speciality Minerals


STURCAL L® & CALOPAKE Extra Light®

(Precipitated) Calcium Carbonate USP/NF, EP, JP


Precipitated Calcium Carbonate (PCC), alternatively known as purified, refined or synthetic calcium carbonate is produced by direct carbonation of hydrated lime by a simple process called “Milk of lime” process. The process involves combining lime (CaO) with water to form slaked lime, addition of carbon dioxide and precipitation of calcium carbonate in a very fine, white form. The precipitated calcium carbonate is then washed, purified, dried and packaged.

Specialty Minerals Inc. uses high quality limestone sources for its PCC products, including some from the 150 year old SMI limestone mine in Adams, Massachusetts. Although a number of different calcite crystal forms are possible, Sturcal L & Calopake Extra Light consist of agglomerates of scalenohedral calcite crystals. The two grades differ in particle size and apparent densities and are compliant as per USP/NF, EP & JP.


Grade Description Median Particle size (μm)
 Application

Sturcal L

 Heavy grade, apparent density: 0.78 – 0.96

75 μ

Used mainly in antacid tablets and liquids, in dentifrices &
therapeutically as calcium supplement in pharmaceuticals & fortified foods.
Calopake Extra Light Extra light grade, apparent density: 0.42 – 0.50 45 μ Used as abrasive in dentifrice products, for calcium
supplementation in nutritional and pharma products, also as antacid, pH modulator and flocculent.