QC/T 950-2019 in English

4.2.7 Temperature rise rate requirements

Under 0℃ ambient conditions, after 5 minutes of heating at the highest level, the seat surface temperature should be ≥30℃. A real person of 175cm±5cm/75kg±5kg should be used for the test, and the temperature measurement points should be arranged away from the stitching area.

4.2.8 Saturation temperature control

Differences between the two control methods:

• Automatic temperature controller: Steady-state temperature control within the set value ±5℃
• Temperature control unit: Steady-state temperature control within the set value ±3℃

5.14 Human entry and exit simulation test

Adopting SAE J826 standard 50% dummy model, 44.5kg load:

1. 25,000 cycles for front seats
2. 10,000 cycles for rear seats
3. Test frequency 4.5 times/minute

5.18 Adhesion test

Applicable only to adhesive-fixed products: After continuous pressure application of 42kg load (300mm×400mm area) for 24 hours, peel off at a speed of <50mm/min. The foam must be peeled off simultaneously with the heating pad.

Material selection

The heating unit substrate must meet the following requirements:

• Bending resistance 50,000 times (0.5-1Hz frequency)
• Burning rate ≤100mm/min (passenger car ≤70mm/min)
• Meet the requirements of GB/T 30512 banned substances

Production process control

Key monitoring points:

1. Resistance value deviation is controlled within ±10%
2. Wire harness connection strength: forward ≥50N, reverse ≥25N
3. Temperature sensor installed to avoid seat belt reminder device