Modified Nylon for Automotive Headlight Rear Covers & Housing Covers

2026-03-22　

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Modified Nylon for Automotive Headlight Rear Covers & Housing Covers.

1. Why Modified Nylon?
Headlight interiors operate under harsh conditions, requiring materials to meet these demands:
High temperature resistance (lamp cavity temperatures up to 120–150℃ for LED/xenon lamps)
Dimensional stability (no warping, air leakage or water leakage)
Thermal shock resistance (no cracking under thermal cycles from -40℃ to 150℃)
High strength, good toughness and vibration resistance
Good injection moldability and cost efficiency
PC/ABS has insufficient heat resistance, while PBT offers mediocre toughness. Glass fiber reinforced nylon provides the best overall performance.

2. Most Common Modified Nylon Systems

2.1 Glass Fiber Reinforced PA6 (Cost-effective Standard Grade)
Typical: PA6+GF20 / GF30
Advantages: Good flowability, easy molding, low cost
Application: Rear covers of standard headlights, peripheral housings, non-high-temperature brackets
Long-term heat resistance: approx. 110–120℃

2.2 Glass Fiber Reinforced PA66 (High-strength Heat-resistant Grade)
Typical: PA66+GF25 / GF30
Advantages: Significantly better rigidity, heat resistance and creep resistance than PA6
Application: Main headlight housings, rear covers, adjusting mechanism bases
Long-term heat resistance: approx. 125–130℃
Industry standard material

2.3 PA66/PA6 + Glass Fiber + Mineral Filler (Low-warpage Special Grade)
Typical: approx. GF15+Mineral20
Advantages: Minimal warpage, smooth surface, ideal for large rear covers
Application: Large-size lamp housings, rear covers, exterior covers

2.4 High-temperature Nylon (PPA / PA6T / PA9T) for High-end LED Headlights
Advantages: Ultra-high heat resistance, low moisture absorption, excellent dimensional stability
Application: Module bases and reflector brackets near LED light sources (highest temperature zones)
Long-term heat resistance: above 150℃

2.5 Toughened Cold-resistant Nylon (Essential for Frigid Regions)
Modified with grafted POE / EPDM
Ensures no brittle fracture at -30℃ to -40℃

2.6 UV-stabilized Weather-resistant Nylon (For Exposed Parts)
Added UV stabilizers and antioxidants
Prevents yellowing and embrittlement from long-term sun exposure.

3. Key Performance Requirements (General Automotive Lighting Standards)
Heat Deflection Temperature (HDT): ≥220℃ (1.82MPa)
Long-term heat aging: No cracking or deformation after 1000h at 130℃
Low-temperature toughness: No brittle fracture under impact at -30℃
Dimensional stability: Low moisture-induced deformation, leak-proof assembly
Thermal shock resistance: No cracking after 200 cycles between -40℃ and 120℃
Environmental compliance: Meets ELV, halogen-free and low-VOC requirements.

4. Material Selection by Component

Component	Recommended Material	Reasons
Headlight rear cover	PA66+GF30 / PA6+GF30	Good heat resistance, sufficient strength, moderate cost
Main headlight housing	Low-warpage PA66+GF30	Minimizes deformation for large surfaces
Base near light source	PPA/PA6T+GF30	High heat resistance and dimensional stability
Adjusting bracket / clip	Toughened PA66+GF25	High toughness and vibration resistance
Exposed decorative cover	UV-stabilized PA66+GF	Prevents aging from sunlight

* 以上应用案例或许和您计划开发的产品不完全匹配。您可以提出产品工况、性能指标、成本要求等需求，我们将为您针对性推荐合适的改性原料方案。

下一篇：Application of PA6+GF40 in Automotive Components

Modified Nylon for Automotive Headlight Rear Covers &amp; Housing Covers

Modified Nylon for Automotive Headlight Rear Covers & Housing Covers