Introduction to Truck Brake Shoes NAO (Non-Asbestos Organic) Mixture
Truck brake shoes NAO (Non-Asbestos Organic) mixtures are eco-friendly brake shoes friction materials designed to replace traditional asbestos-based formulations. This brake shoes formula combines organic fibers (aramid, cellulose), resin binders, ceramic particles, and friction modifiers to achieve balanced braking performance, low noise, and minimal environmental impact. Below is a detailed analysis of its composition, technical specifications, advantages, and storage protocols.
Technical Parameters
The table below summarizes the critical properties of NAO-based brake shoes mixes:
| Parameter | Specification | Remarks |
|---|---|---|
| Organic Fiber Content | 20-35% (Aramid, Cellulose) | Ensures flexibility and noise reduction |
| Density | 2.0-2.5 g/cm³ | Lightweight design for reduced axle load |
| Friction Coefficient (μ) | 0.35-0.45 (Dry) | Stable across urban and highway driving |
| Operating Temperature | 0°C to 600°C | Resists thermal degradation |
| Compressive Strength | ≥250 MPa | Maintains integrity under heavy loads |
| Wear Rate | ≤0.3 cm³/MJ | Extended lifespan (80,000–200,000 km) |
| Shore Hardness | 50-65 Shore D | Optimized for smooth drum contact |
Key Advantages
- Eco-Friendly Composition
Free from asbestos and heavy metals, NAO brake shoes mixtures comply with global environmental regulations (e.g., REACH, RoHS) . - Low Noise and Vibration
Organic fibers and ceramic additives dampen vibrations, reducing brake squeal by up to 40% compared to semi-metallic formulations . - Thermal Stability
Ceramic-enhanced brake shoes friction materials maintain consistent friction performance even at high temperatures (up to 600°C) . - Compatibility with Diverse Drums
Suitable for cast iron, steel, and composite brake drums, ensuring broad applicability in commercial vehicles . - Reduced Dust Generation
Low-abrasive formulations minimize brake dust, preserving wheel cleanliness and reducing maintenance frequency.
Storage and Packaging
- Moisture Protection: Packaged in vacuum-sealed, anti-humidity bags to prevent resin degradation .
- Temperature Limits: Store in environments between -10°C and 40°C to avoid binder crystallization.
- Stacking Guidelines: Maximum 5 layers to prevent deformation of friction linings .
- Shelf Life: 24 months in unopened, original packaging.
Application of Brake Shoes Mixes
NAO brake shoes mixes are compression-molded at 150–200°C under 10–20 MPa pressure, ensuring strong adhesion to shoe plates. Post-production, they undergo quality tests for shear strength (≥3.8 MPa) and thermal cycling resistance . Manufacturers often customize the brake shoes formula by adjusting fiber-to-ceramic ratios to meet OEM specifications for noise, wear, or regional climate demands.
By integrating sustainable materials with advanced engineering, NAO-based brake shoes deliver reliable braking performance while addressing modern environmental and operational challenges.