Jan . 20, 2026 13:59 Back to list

China Calcium Carbonate Powder(CAS 471-34-1): Physicochemical Parameters & Industrial Compounding Efficiency

Calcium Carbonate (CaCO₃) is a fundamental inorganic compound sourced from high-grade limestone, aragonite, and calcite deposits. In industrial manufacturing, it functions as a critical functional filler, rheology modifier, and cost-optimization agent. This technical document outlines the physical parameters, chemical stability, and cross-industry application benchmarks for procurement and materials engineering.

1. Physical & Chemical Characterization

Core Chemical Profile: High-purity precipitated and ground calcium carbonate (GCC/PCC) exhibits neutral pH (9.91) and is insoluble in water, ensuring matrix stability in aqueous and non-aqueous systems.

Property	Standard Value / Limit	Testing Method / Note
Molecular Formula / Mass	CaCO₃ / 100.09 g/mol	CAS No: 471-34-1
Purity (CaCO₃ Content)	96% - 99.5%	Determines filler effectiveness & brightness
Density	2.71 - 2.93 g/mL	At 25 °C (lit.)
Refractive Index	1.6583	Critical for gloss/opacity control
Melting Point	825 °C	High thermal stability for polymer processing
Solubility	14 mg/L (25℃)	Soluble in HCl (Reaction releases CO₂)
Moisture Content	< 0.5%	Prevents clumping and curing interference

2. Industrial Application Matrix & Functional Benefits

2.1 Polymers, Plastics & Rubber (SMC, BMC, Vinyl)

Formability & Rheology: Enhances the flow properties of polyethylene resin during blow molding and extrusion.
Mechanical Reinforcement: Maintains impact strength and tensile properties even at high filling volumes.
Vinyl Flooring: Functions as a weighting agent and stiffener to ensure dimensional stability and flatness.
Rubber Compounding: Acts as both an extender and detacktifying agent; provides abrasion resistance in heavy-duty applications.

2.2 Coatings, Paints & Adhesives

TiO₂ Extension: Acts as a spacer for Titanium Dioxide, reducing raw material costs while maintaining opacity and whiteness (90% - 98%).
Viscosity Control: Minimizes compound shrinkage and cracking in joint compounds and sealants.
Gloss Management: Fine-tuned particle sizes (1-5μm) allow for precise enhancement or reduction of surface gloss.

2.3 Environmental & Specialized Applications

Water Treatment: Used for pH adjustment, corrosion control, and remineralization in Reverse Osmosis (RO) systems.
Thermoset Systems: Essential extender in fiberglass-reinforced polyesters (SMC/BMC) with zero adverse effects on physical curing properties.
Paper & Ceramics: Utilized for bulk density control (0.8 - 1.2 g/cm³) and surface brightness.

3. Comparative Performance Analysis: Chinese Supply Chain

The following data represents typical output from vertically integrated Chinese mining operations, utilizing advanced milling and classification technology.

Supplier Grade	Purity (%)	Particle Size (D50 μm)	Oil Absorption (g/100g)	Industry Focus
High-Purity Technical Grade	≥ 99.0	1.0 - 2.5	低 (Low)	Pharmaceutical, Coatings, Adhesives
Standard Industrial Grade	97.5 - 98.5	3.0 - 8.0	中 (Medium)	Plastics, Rubber, Vinyl Flooring
Cost-Effective Extender	95.0 - 97.0	8.0 - 15.0	高 (High)	Cement, Agriculture, Environmental

4. Stability, Storage & Safety Compliance

Chemical Stability: Stable under recommended storage conditions (+5°C to +30°C).
Incompatibility: Avoid contact with strong acids, fluorine, ammonium salts, and alum.
Additives: Premium grades may contain antioxidants and anti-aging agents to extend the service life of final polymer products.
Logistics: Available in moisture-proof industrial bags with global ISO certification for traceability.

Audit Checklist for Procurement:

1. Verify CAS 471-34-1 purity via COA (Certificate of Analysis).
2. Confirm particle size distribution (D50/D97) matches specific equipment tolerances.
3. Evaluate oil absorption values for ink and coating applications to minimize resin waste.

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