ECONAMID® FL 66G25H1
PA66 · 25% Glass Fiber Reinforced · Heat Stabilized · Lightweight Cooling System Solution
The automotive cooling fan is a critical component of the engine cooling system, responsible for dissipating heat from the radiator to maintain optimal engine operating temperature. Fan blades operate under high temperature, high-speed rotation, and continuous vibration, demanding exceptional stiffness, heat resistance, fatigue resistance, and dimensional stability. ECONAMID® FL 66G25H1, a 25% glass fiber reinforced, heat-stabilized polyamide 66 (PA66) compound, is the ideal choice for automotive cooling fan blades.
The cooling fan is located behind the radiator, expelling heat absorbed by the coolant
1. Application & Component Requirements
Automotive cooling fan blades are mounted behind the radiator in the engine compartment, operating under demanding conditions:
Engine compartment temperatures reach 120-140°C; fan blades must withstand prolonged heat exposure.
Fan speeds reach 2000-4000 rpm; blades endure continuous centrifugal and fatigue loads.
High humidity near radiator with potential coolant and moisture exposure.
Dynamic balancing demands precise dimensional stability.
2. Material Selection Rationale
Why choose ECONAMID FL 66G25H1 for cooling fan blades?
Tensile modulus of 8000 MPa and flexural modulus of 6900 MPa ensure fan blades maintain shape at high speeds for optimal aerodynamic performance.
HDT of 250°C @ 1.8MPa and melting point of 262°C meet demanding engine compartment requirements.
H1 heat stabilization rating ensures excellent mechanical property retention after long-term thermal aging.
Good flowability enables one-piece molding of complex thin-wall structures, improving production efficiency.
40-50% weight reduction vs. metal fans, reducing rotational inertia and energy consumption.
Long-term market validation across mainstream vehicle cooling systems.
3. Key Performance Data
| Property | Standard | Value | Unit |
|---|---|---|---|
| Density | ISO 1183 | 1.32 | g/cm³ |
| Tensile Modulus | ISO 527 | 8000 | MPa |
| Tensile Strength at Break | ISO 527 | 135 | MPa |
| Strain at Break | ISO 527 | 3 | % |
| Flexural Modulus | ISO 178 | 6900 | MPa |
| Flexural Strength | ISO 178 | 170 | MPa |
| Charpy Notched Impact | ISO 179/1eA | 5 | kJ/m² |
| Melting Point | ISO 11357-1 | 262 | °C |
| HDT (1.8MPa) | ISO 75 | 250 | °C |
| HDT (0.45MPa) | ISO 75 | 255 | °C |
| Volume Resistivity | IEC 62631-3-1 | 10¹⁵ | Ω·cm |
4. Competitive Advantages
| Comparison | ECONAMID FL 66G25H1 | Metal Fan | Standard PA6/PA66 |
|---|---|---|---|
| Density | 1.32 g/cm³ | ~2.7-7.8 g/cm³ | ~1.14-1.36 g/cm³ |
| Tensile Modulus | 8000 MPa | ~70000 MPa (Steel) | ~3000-5000 MPa |
| Weight Reduction | Baseline | ↓ 40-50% | Similar |
| Corrosion Resistance | ✅ Excellent | ⚠️ Rust treatment needed | ✅ Good |
| Design Freedom | ✅ High | ❌ Low | ✅ High |
| HDT | 250°C | N/A | ~200-240°C |
| Cost | Medium | High | Low-Medium |