Airbag Inflator Filter in 304 Stainless Steel (AISI 304 (1.4301)) is used for cooling the hot gas from a pyrotechnic airbag inflator and trapping burning slag particles so the cushion fills with clean, cooler gas. The alloy gives good general corrosion resistance in atmosphere and fresh water and is essentially non-magnetic (annealed), with a practical service limit of approx. +450 °C continuous.
Alloy Properties
| Grade designation | AISI 304 (1.4301) |
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| Magnetic response | Essentially non-magnetic (annealed) |
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| Service temperature | approx. +450 °C continuous |
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| Corrosion characteristic | Good general corrosion resistance in atmosphere and fresh water |
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Specifications of Airbag Inflator Filter Available in 304 Stainless Steel
| Size | Outer diameter (mm) | Length (mm) | Wire diameter (mm) | Construction | Density (%) |
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| Driver 55 | 55 | 22 | 0.30 | Knitted + pressed | 28 |
| Driver 62 | 62 | 25 | 0.30 | Knitted + pressed | 30 |
| Passenger 38 | 38 | 120 | 0.40 | Layered woven + knitted | 32 |
| Side 26 | 26 | 60 | 0.25 | Knitted + pressed | 26 |
Where 304 Stainless Steel Airbag Inflator Filter Is Used
- Airbag module OEMs: driver, passenger, side and curtain inflator filters.
- Tier-1 inflator assemblers: filters supplied on PPAP-approved drawings.
- Seat-belt pretensioner makers: small gas-generator filters.
- Other pyrotechnic actuators: hood lifters and battery disconnects.
Ordering Airbag Inflator Filter in 304 Stainless Steel
- Density & mass: Pressed density and part weight set the cooling capacity and pressure drop; both are controlled per lot.
- Wire: Knitted carbon or stainless wire of 0.25–0.40 mm, sometimes layered with woven screen.
- Dimensions: Outer and inner diameter and length to the inflator drawing, typically ±0.1 mm.
Mistakes to Avoid with Airbag Inflator Filter
- Allowing density to drift between lots, which alters inflation time and gas temperature.
- Substituting wire grade or diameter without revalidating to USCAR-24.
