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SCHOTT North America
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Housings for Airbag Ignitors and Seatbelt Pretensioners
Airbags and seatbelt pretensioners are the most well-known among safety devices. Both of these types of equipment are based on similar operating principles: in the event of a collision, the crash sensors transmit an electrical signal to the inflator, which then ignites the initiator charge.
In airbags, this initiator charge ensures that the gas generator rapidly delivers large quantities of gas into the airbag; in seatbelt pretensioners, this charge activates the retractor mechanism, which continues tightening the belt until the passenger has settled in a specific seating position and the risk of injury has been minimized.
In both cases, it is extremely important that the initiator charge is protected long-term to ensure that these vital components will continue to be able to function at all times irrespective of the age of the vehicle.
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Product Description
The electrical signal to the dry and safely encapsulated initiator charge is transmitted through a hermetic glass-to-metal sealed feedthrough. It is manufactured in pressure glazing technology whereby the different expansion coefficients of the outer metal, the glass and power pins are used to achieve a robust component during the cooling down phase in the sealing process.
Product Advantages
The combination of glass and metal ensures that the electronic feedthroughs are totally isolated from their surroundings and permanently sealed. The materials used for the feedthroughs are highly resistant to temperature fluctuations, vibrations and other physical and chemical influences.
We are familiar with the construction techniques used worldwide in this field and are therefore able to specifically and optimally adapt housing components to customer requirements.
Applications
Glass-to-metal sealed feedthroughs are suitable for all applications that require reliable, long-term transmission of an electrical signal for the ignition of hermetically sealed explosive loads. Other areas of application include battery cut-offs.
Technology
To ensure the reliable hermeticity of these housing components, glass-to-metal sealing technology is used. Please click on this page for more information.
The type of glass and metal used differs, depending on the customer’s requirements and the type of feedthrough required. Very often, these feedthroughs are produced using steel and stainless steel, due to their high resistance to corrosion. Other options include nickel and/or gold plating in compliance with the latest automotive industry standards.
Features / Specifications
Glass-metal feedthroughs can be extremely resistant to pressure (up to 4,000 bar). The fused-in pins can have torques of up to 400 Newtons.
Forms of Supply and Product Packaging
All products can be packaged individually and supplied on trays.
Quality Assurance
All our Automotive Division production facilities are TS 16949 certified. Our fully automated quality control implements the ‘zero ppm philosophy’.
For more information, please refer to our quality assurance processes.
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