Calcite Aggregate is an industrial raw material with a calcium carbonate (CaCO3) content of 98% and above, supplied from chips obtained during the cutting and processing of Marmara marble and from screened raw blocks. Once seen merely as waste years ago, today this material has become one of the essential filler materials of the glass, plastic, paper, paint, and construction chemicals industries. The high calcite purity of Marmara marble directly explains why this aggregate is preferred in these applications.
The size spectrum is the first technical parameter that determines which sector the Calcite Aggregate will serve. Micronized powder in the 0-1 mm range is used as a filler material in the plastics and paint sectors, and within this range there are also ultra-fine powders reduced to 40 microns or below. The 1-5 mm class is generally used in PVC profiles and composite materials, the 5-15 mm class in construction chemicals and decorative plaster additives, the 15-25 mm class in landscape and specialty concrete applications, and the 25-40 mm class as decorative gravel and for drainage. Custom sieve ranges can also be prepared according to the client's application.
Chemical purity directly determines the value of Calcite Aggregate. The Calcite Aggregate we source from Marmara marble has a CaCO3 ratio of 98% and above. The magnesium oxide (MgO) ratio in the structure is kept low and the presence of iron oxide (Fe2O3) is categorized by class. Iron oxide directly affects the whiteness of the aggregate, which is why lots reserved for the glass and premium paint sectors are sourced specifically from blocks with low Fe2O3 values. SiO2, Al2O3, and other trace elements are also kept within specific tolerances.
Whiteness is a defining quality parameter, especially in sectors where Calcite Aggregate is used as a filler. CIE Y or R457 (ISO brightness) values are measured through laboratory tests. A high whiteness value means that the aggregate does not compromise the color fidelity of the plastic, paper, or paint it is added to, and that it can capture premium white tones. The natural purity of Marmara marble calcite keeps its whiteness ratio notably high compared to competing sources.
The use areas are very wide. In the glass sector it enters the formulation as calcium carbonate alongside the SiO2 source and balances the melting temperature of glass. In the plastics composite sector, it acts as a filler in PVC profiles, polypropylene, and polyethylene products, both lowering cost and improving mechanical properties. PVC window profiles, cable insulation, and home appliance parts are leading applications. In the paper sector, it is used in coated and filler paper production for surface coating and brightness. In the paint sector, it functions as a filler pigment, increasing hiding power and reducing cost. In construction chemicals, it appears in joint fillers, decorative plaster, and specialty concretes as filler. In the animal feed sector, it is used as a calcium supplement, particularly in poultry feed. In addition, landscape and drainage applications, aquarium gravel, and decorative garden uses are also common.
