Introduction to Heavy Calcium Carbonate in Brake Linings Formulas
Heavy Calcium Carbonate (HCC) is a cost-effective and versatile filler widely used in brake linings mixtures, enhancing the performance and manufacturability of Brake Linings Friction Materials. Its high purity, thermal stability, and compatibility with other Brake Linings Ingredients make it a critical component in optimizing Brake Linings Mixes for durability and noise reduction. Below is a detailed technical overview, including specifications, advantages, and storage guidelines.
Technical Parameters of Heavy Calcium Carbonate in Brake Linings Formula
| Property | Specification | Test Method |
|---|---|---|
| Purity (CaCO₃ content) | ≥98% | ASTM C25 |
| Particle Size (μm) | 5-20 (adjustable for formulation) | Laser Diffraction |
| Bulk Density (g/cm³) | 0.8-1.2 | ASTM B212 |
| Thermal Stability | Stable up to 500°C | ISO 11358 |
| Mohs Hardness | 3.0 | ASTM E384 |
| Moisture Content | ≤0.5% | ASTM D2216 |
Advantages of Heavy Calcium Carbonate in Brake Linings Ingredients
- Cost-Effective Filler:
HCC reduces production costs in brake linings formula while maintaining mechanical integrity, making it ideal for high-volume manufacturing. - Improved Processability:
Its fine particle size ensures uniform dispersion in brake linings mixes, enhancing mold flow and reducing voids during compression molding. - Thermal Stability:
Withstands high braking temperatures (up to 500°C), preventing degradation and maintaining structural stability in brake linings friction materials. - Noise Dampening:
Acts as a vibration dampener, reducing brake squeal by absorbing high-frequency oscillations in the Brake Linings Mixture. - Synergy with Other Components:
Compatible with resins, steel fibers, and graphite in brake linings formula, ensuring balanced friction coefficients and wear resistance.
Storage and Packaging Guidelines
To preserve the quality of HCC in brake linings ingredients:
- Packaging: Moisture-resistant, sealed paper bags with polyethylene liners or bulk containers .
- Storage Conditions:
- Temperature: <30°C
- Humidity: <60% RH
- Avoid exposure to acidic/alkaline environments and direct sunlight.
- Shelf Life: 12-18 months in unopened, dry packaging .
Key Applications in Brake Linings Mixtures
HCC is typically blended with:
- Binders: Phenolic resins or polyurethane.
- Reinforcements: Aramid fibers, steel wool.
- Friction Modifiers: Graphite, cashew dust.
This combination ensures a robust brake linings formula that meets OEM standards for thermal performance, noise control, and environmental compliance (e.g., low copper content) .