Ground Calcium Carbonate (GCC)
Ground Calcium Carbonate (GCC), sourced from natural minerals like limestone, is processed by mechanical grinding. It features high purity and uniform particle distribution. Classified by size and surface treatment, GCC is used in rubber, plastics, paper, etc., offering cost - effective and performance - enhancing benefits.
Product Details
What is Ground Calcium Carbonate (GCC)?
Ground Calcium Carbonate (GCC), also known as limestone powder or heavy calcium carbonate, is a white inorganic powder derived from natural minerals like calcite, limestone, marble, chalk, and shells. Through mechanical grinding, these raw materials are processed into fine particles with high purity (>98% CaCO₃), chemical stability, and uniform particle distribution.
Key Characteristics:
Natural Origins: Sourced from premium limestone deposits in Egypt, Pakistan, Vietnam, and China.
Appearance: Gray-white or brown granular solid with slight acidity.
Versatility: A cost-effective, eco-friendly filler for industries ranging from plastics to construction.
Classification of GCC Powder
By Particle Size
| Category | Particle Size (D50) | Applications |
|---|---|---|
| Coarse GCC | >5μm | Rubber compounding, construction materials |
| Fine GCC | 0.1–1μm | Paper filling, general-purpose plastics |
| Ultra-Fine GCC | 0.02–0.1μm | High-gloss coatings, adhesives |
| Nano GCC | <0.02μm | Transparent films, advanced composites |
By Surface Treatment
| Type | Coating Agent | Benefits |
|---|---|---|
| Unmodified GCC | None | Budget-friendly filler for basic uses |
| Stearic Acid-Coated | Stearic acid (1–2%) | Reduces oil absorption (≤25g/100g), enhances polymer compatibility |
| Functionalized GCC | Silane/Titanium Dioxide | Improves UV resistance, antibacterial properties |
For more details on the performance and manufacturing of coated calcium carbonate, please visit our Coated Calcium Carbonate Powder page.
GCC Production Process
Dry Processing
Steps: Crushing → Raymond mill grinding → Classification → Packaging
Advantages:
- Low energy consumption (≤50kWh/ton)
- High output (10+ tons/hour)
- Ideal for coarse/fine powder production
Wet Processing
Steps: Dry powder + water → Wet ball milling → Spray drying → Ultra-fine GCC
Advantages:
- Precise particle control (D50 tolerance ≤0.2μm)
- Superior dispersion (Hegman fineness ≥7)
Surface Modification
- Stearic Acid Treatment: 90%+ coverage, reduces oil absorption by 30%
- Nano GCC: 50–100nm particles for high-strength engineering plastics
Technical Specifications
| Parameter | Standard Value | Testing Method |
|---|---|---|
| Brightness | ≥93% | ISO 2470 |
| CaCO₃ Purity | ≥98% | XRF Spectroscopy |
| Oil Absorption | ≤25g/100g | ISO 787-5 |
| Moisture Content | ≤0.5% | Oven-drying at 105°C |
Customization Options: Adjustable particle size (0.5–15μm), surface treatment, packaging (25kg bags/1-ton pallets).
Core Advantages of GCC
Premium Raw Materials
- Sourced from high-grade limestone deposits (Fe₂O₃ <0.1%, SiO₂ <0.2%)
- Rigorous XRF pre-screening to eliminate impurities
Advanced Manufacturing
- Dual Processing: Dry method for bulk orders, wet method for ultra-fine powder
- Smart Quality Control: Real-time laser particle monitoring (CV <5%)
Unmatched Performance
- Plastics: Boosts heat resistance (HDT +8°C) and flexural strength (+15%)
- Rubber: Enhances tensile strength (+12%) and abrasion resistance (-20% wear)
- Coatings: Achieves 0.95+ contrast ratio and 5,000+ scrub cycles
Quality Certifications
- Global Compliance: ISO 9001, FDA (food-grade), REACH, Halal
- Safety Assurance: SGS-tested heavy metals (Pb/Cd/As <10ppm), non-toxic
- Quality Control: 3-stage inspection (raw material → production → final product)
Applications of Ground Calcium Carbonate (GCC)
Rubber Industry
- Cost Savings: Replace 30–50% of natural rubber, reducing material costs by 15–25%
- Performance Boost: +10% tensile strength (ASTM D412), +8% tear resistance (ASTM D624)
Plastics Manufacturing
- Thermal Stability: Raise HDT by 5–10°C in PP/PE
- Aesthetic Appeal: 93%+ brightness for replacing titanium dioxide
Paper Production
- Filler Alternative: Substitute 15–30% wood pulp, maintaining 88%+ brightness
- Eco-Friendly: Reduces fiber consumption in recycled paper
Paints & Coatings
- Low Oil Absorption: Cuts emulsion usage by 15–20%
- Durability: 5,000+ scrub cycles (GB/T 9266), anti-settling properties
Construction Materials
- Concrete Reinforcement: 5–8% GCC increases compressive strength to ≥45MPa
- 3D Printing: Enhances mortar flowability and crack resistance
Other Uses
- Fireproof Ceilings: 30% GCC improves flame resistance (1+ hour)
- Animal Feed: FDA-approved calcium supplement (38%+ Ca content)
- Wastewater Treatment: Neutralizes acidity, removes 85%+ heavy metals
FAQs of GCC
Ordering & Support
Why Choose Our Ground Calcium Carbonate?
Jintai, a leading calcium carbonate supplier, Our GCC stands out with industry-leading purity, precision manufacturing, and globally certified quality. Whether you’re producing plastics, coatings, or construction materials, our limestone-based filler delivers unmatched performance while slashing costs.
Request free samples and technical data sheets to experience how Jintai’s GCC optimizes your material costs and performance.
