Silicone Coating for Automotive Airbags
topic
Airbag fabrics require silicone coating (20–35 g/m²) on woven nylon 6.6 (420–630 denier, plain weave at 17–22 threads/cm) to control gas permeability below 0.5 L/dm²/min (ISO 9237) and withstand deployment temperatures of 200–300°C for 30–50 milliseconds. One-component addition-cure silicone is applied via knife-over-roll, cured at 160–180°C. Tensile retention after heat aging at 120°C/500 hours exceeds 80% (ISO 188). Coating must maintain flexibility at -35°C. Global airbag fabric market consumes 500 million m² annually at $3–6/m². Driver and passenger airbags, side curtains, and knee airbags are primary applications in modern vehicle safety systems.
Role
Safety-critical coating enabling reliable airbag deployment within 20–30 milliseconds of impact detection, directly protecting vehicle occupants by maintaining gas containment during the microseconds of cushion inflation and occupant interaction.