Introduction to Heavy Magnesium Oxide in Brake Linings Formulas
Heavy Magnesium Oxide (MgO) is a versatile inorganic additive widely used in brake linings mixtures, serving as a cost-effective filler and friction modifier in Brake Linings Friction Materials. Its high thermal stability, alkaline nature, and compatibility with other Brake Linings Ingredients make it indispensable for optimizing performance, durability, and environmental compliance. Below is a detailed technical overview, including specifications, advantages, and storage guidelines.
Technical Parameters of Heavy Magnesium Oxide in Brake Linings Formula
| Property | Specification | Test Method |
|---|---|---|
| Purity (MgO Content) | ≥95% | ASTM E815 |
| Particle Size (μm) | 10-50 (adjustable for formulation) | Laser Diffraction |
| Bulk Density (g/cm³) | 1.8-2.2 | ASTM B212 |
| Melting Point | ~2850°C | ASTM E29 |
| Thermal Conductivity | 30-45 W/m·K | ASTM E1461 |
| pH Value (10% slurry) | 10-12 | ISO 787-9 |
| Content in Formula | 5-15% (by weight) | Custom formulation |
Advantages of Heavy Magnesium Oxide in Brake Linings Mixes
- Thermal Stability and Heat Dissipation:
Heavy MgO’s high melting point and thermal conductivity efficiently absorb and dissipate heat generated during braking, reducing thermal degradation of brake linings friction materials and preventing brake fade under extreme conditions. - Friction Coefficient Modulation:
Acts as a mild abrasive in the brake linings formula, stabilizing friction performance across temperature ranges while minimizing noise and vibration. - Corrosion and Wear Resistance:
Its alkaline properties neutralize acidic byproducts (e.g., from resin decomposition), protecting metal components in the Brake Linings Mixture and extending service life. - Eco-Friendly Formulations:
Replaces hazardous materials like asbestos in brake linings ingredients, aligning with global regulations (e.g., EU REACH). - Cost-Effective Filler:
Reduces production costs by diluting high-price components (e.g., aramid fibers) while maintaining structural integrity in brake linings mixes.
Storage and Packaging Guidelines
To preserve the quality of Heavy MgO in brake linings formula:
- Packaging: Use moisture-resistant, multi-layer kraft paper bags or polypropylene woven sacks with inner polyethylene liners.
- Storage Conditions:
- Temperature: <35°C
- Humidity: <50% RH
- Avoid contact with acidic substances or prolonged exposure to CO₂ (to prevent carbonation).
- Shelf Life: 12-18 months in unopened, dry packaging.
Key Applications in Brake Linings Mixtures
Heavy MgO is typically blended with:
- Binders: Phenolic resins or rubber-based adhesives.
- Reinforcements: Steel fibers, glass fibers.
- Friction Modifiers: Graphite, barite.
This synergy ensures a balanced brake linings formula that meets OEM requirements for high friction efficiency, low wear rates, and minimal environmental impact.