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High Purity Heavy Calcium Carbonate Powder (CAS: 471-34-1) is a naturally occurring mineral filler produced by crushing and grinding high-grade limestone, resulting in a calcium carbonate content ≥97% and a median particle size ranging from 10–100μm. This off-white powder offers a cost-effective reinforcement solution for industries requiring high filler loading, with excellent chemical stability and compatibility with both polar and non-polar polymers. Derived from sedimentary rocks with low iron and manganese content, it is ideal for applications demanding consistent quality and natural whiteness (CIELAB L* ≥90).
Natural Origin and High Purity:
97% Minimum Purity: Sourced from premium limestone deposits (CaCO₃ ≥97%, MgCO₃ ≤2%, SiO₂ ≤0.5%), ensuring minimal interference in chemical reactions and product discoloration.
High Whiteness: L* value ≥90 (ISO 2470), making it suitable for white and light-colored products like paper, coatings, and plastics.
Diverse Particle Size Grades:
Controlled Grind Sizes: Available in coarse (50–100μm, D90 ≤150μm), medium (20–50μm, D90 ≤80μm), and fine (10–20μm, D90 ≤30μm) grades to optimize flowability and packing density in different matrices.
Low Dust Generation: Surface-treated grades (stearic acid, 0.5%) reduce dust emission by 30%, improving workplace safety and process efficiency.
Wide Compatibility and Performance:
Polymer Neutrality: Chemically inert in most polymers, preventing adverse reactions with stabilizers, plasticizers, or colorants in PVC, PE, PP, and rubber compounds.
Mechanical Reinforcement: Increases tensile strength (10–15%) and flexural modulus (15–20%) in thermoplastics at 15–30% loading, with minimal impact on melt flow index (MFI reduction ≤10%).
Coatings and Paints:
Architectural Paints: Fills latex and alkyd coatings (20–40% PVC), improving hiding power (ISO 6504) and scrub resistance (≥500 cycles) while reducing titanium dioxide usage by 10–15%.
Industrial Coatings: Enhances corrosion resistance in epoxy primers by filling microvoids, reducing water permeability (water absorption -18%) and improving adhesion to metal substrates
Paper Manufacturing:
Paper Filler: Used in wood-free paper (15–25% loading), increasing bulk (1.2–1.4 cm³/g) and opacity (ISO 2471 ≥90%) without compromising printability (IGT ink absorption ≤25%).
Corrugated Board: Improves stiffness (ECT +10%) and moisture resistance (Cobb value -12%) in linerboard, critical for heavy-duty packaging.
Rubber and Plastics:
Tire Tread Rubber: Fills natural rubber (NR) compounds (10–20% loading), enhancing grip (SBR friction coefficient +5%) and reducing rolling resistance (energy loss -8%).
PVC Cable Insulation: Increases electrical resistivity (≥10¹⁴ Ω·cm) and flame retardancy (UL94 V-0 at 30% loading), suitable for low-voltage power cables.
Construction Materials:
Adhesives and Sealants: Fills silicone and acrylic formulations, improving thixotropy (anti-sedimentation) and reducing shrinkage (cure shrinkage ≤0.5%).
Cementitious Composites: Used in fiber-reinforced cement (5–10% replacement for sand), enhancing flexural strength (3–5 MPa) and reducing drying shrinkage (0.03–0.05%).
Physical properties: It is a white powder that is odorless and tasteless. It has a relatively high density, usually between 2.7 and 2.9 g/cm3. It is insoluble in water and ethanol and is stable in the air. Its particle shape is diverse, depending on the processing method. Generally, there are spherical, cubic, flake - like shapes, etc. The particle size can be processed according to different application requirements, ranging from a few microns to tens of microns.
Chemical properties: It is chemically stable under normal temperature and pressure, but it will decompose into calcium oxide and carbon dioxide at high temperatures. It can react with acids to form corresponding calcium salts and carbon dioxide. For example, it reacts with hydrochloric acid to form calcium chloride, water, and carbon dioxide.
Dry process: Natural calcium carbonate ores (such as calcite, marble, etc.) are made into heavy calcium carbonate products of different fineness through crushing and grinding processes. First, the raw ore is initially crushed by coarse - crushing equipment such as jaw crushers, and then it enters grinding equipment such as Raymond mills for grinding. Finally, products of different particle sizes are obtained through classification equipment. The dry process is simple and has a low cost, but the fineness and surface properties of the products are relatively poor.
Wet process: After the ore is crushed, water and dispersants are added for wet grinding to obtain a calcium carbonate slurry, and then the product is made through filtration, drying, and other processes. The wet process can obtain finer products with better surface properties, but the production process is more complex and the cost is higher.
