Introduction to Nitrile Butadiene Rubber (NBR) in Brake Linings Formulas
Nitrile Butadiene Rubber (NBR) is a synthetic elastomer widely utilized in brake linings mixtures due to its exceptional oil resistance, thermal stability, and elasticity. As a key component in Brake Linings Friction Materials, NBR enhances durability and performance under high-stress conditions. This article outlines its technical specifications, advantages, and storage protocols in Brake Linings Mixes.
Technical Parameters of NBR in Brake Linings Formula
| Property | Specification | Test Method |
|---|---|---|
| Acrylonitrile Content | 18-50% (adjustable for formulation) | ASTM D5670 |
| Hardness (Shore A) | 50-90 | ASTM D2240 |
| Tensile Strength | 10-30 MPa | ASTM D412 |
| Density | 0.98-1.20 g/cm³ | ISO 2781 |
| Operating Temperature | -40°C to 120°C | ASTM D1329 |
| Compression Set | ≤25% (22 hrs at 70°C) | ASTM D395 |
| Content in Formula | 5-15% (by weight) | Custom formulation |
Advantages of NBR in Brake Linings Ingredients
- Superior Oil and Fuel Resistance:
NBR’s high acrylonitrile content ensures compatibility with lubricants and hydraulic fluids, preventing degradation in brake linings friction materials exposed to oily environments. - Enhanced Wear Resistance:
Its robust molecular structure reduces abrasive wear, prolonging the lifespan of brake linings mixes under repetitive shear forces. - Thermal Stability:
Withstands temperatures up to 120°C, maintaining elasticity and friction consistency in brake linings formula during prolonged braking. - Noise and Vibration Damping:
Acts as a viscoelastic buffer in Brake Linings Mixture, minimizing squeal and vibrations during dynamic braking. - Compatibility with Hybrid Systems:
Blends seamlessly with phenolic resins, graphite, and metallic fibers in brake linings ingredients, enabling tailored formulations for diverse friction requirements.
Storage and Packaging Guidelines
To preserve NBR’s properties in brake linings formula:
- Packaging: Use UV-resistant, airtight polyethylene bags or drums with desiccants to prevent moisture absorption.
- Storage Conditions:
- Temperature: 10°C–25°C
- Humidity: <50% RH
- Avoid direct sunlight and contact with ozone-generating equipment.
- Shelf Life: 12–18 months in unopened packaging.
Applications in Brake Linings Mixtures
NBR is commonly integrated into brake linings formula alongside:
- Binders: Phenolic or epoxy resins.
- Reinforcements: Aramid fibers, steel wool.
- Fillers: Baryte, calcium carbonate.
This combination ensures a balanced brake linings mixture that meets OEM standards for friction efficiency, heat resistance, and environmental compliance (e.g., low copper content).
For detailed technical data, consult material safety datasheets (MSDS) or suppliers specializing in elastomers for friction applications.