As a critical component of automotive seat comfort and safety, lumbar support airbags must meet rigorous safety standards covering materials, design, performance, testing, and regulations. These standards ensure reliable operation under normal and extreme conditions while safeguarding passenger safety. Below are key safety requirements:
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I. Material Safety Standards
1. Eco-Friendliness and Low Toxicity
- Materials (e.g., PVC, TPU, PU-coated fabrics) must comply with environmental regulations:
- EU REACH, GB/T 26572 (China): Restrict hazardous substances (Pb, Cd, Cr⁶⁺, PBBs, etc.).
- GB 8410 (China) or FMVSS 302 (US): Regulate flammability, limiting burn rates (e.g., ≤100 mm/min).
2. Aging Resistance
- Pass xenon lamp aging tests and high-temperature/humidity cycling to prevent brittleness, discoloration, or performance degradation over time.
- Resist damage from exposure to cleaning agents, sweat, etc., via chemical corrosion resistance testing.
II. Structural and Manufacturing Safety Standards
1. Welding Strength and Sealing
- Welds must exceed base material strength by ≥80% (verified via GB/T 1040 tensile tests and peel tests).
- Leakage test: After inflating to 5–10 kPa, pressure drop must remain ≤5% over 24 hours.
2. Air Chamber Design
- Chambers must distribute stress evenly to avoid localized rupture.
- Edges must be rounded to prevent abrasion against passengers or seat fabric.
3. Overpressure Protection
- Include pressure relief valves or design safety margins to prevent bursting (max design pressure ≤15 kPa).
III. Performance Safety Standards
1. Inflation/Deflation Reliability
- Pass fatigue testing (100,000 inflation cycles) with no leaks, deformations, or damage.
- Achieve inflation within ≤5 seconds to ensure rapid response.
2. Dynamic Safety
- Remain stable during crash tests (C-NCAP, Euro NCAP) without interfering with seatbelts or airbags.
- Vibration testing: No loosening or noise under simulated driving conditions.
3. Ergonomics and User Safety
- Provide adjustable support force to avoid discomfort or muscle fatigue.
- Use soft surface materials to prevent pressure marks or skin irritation during prolonged use.
