Initiator Components

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Fusite's initiator assemblies are the primary component in a variety of electrically stimulated initiation devices. They consist of a metal outer ring and a center pole, which are completely separated by glass insulation. Connecting the inner and outer conductive parts is a very fine 1 Ohm bridge wire, which heats up as an electrical current is passed through it, and upon direct contact, a suitable pyrotechnic compound is initiated. Our initiator seals and components come with the highest levels of stable insulation and corrosion- and pressure-resistance, as well as a long storage life of up to ten years and hermetic protection against moisture. Fusite adds value by welding the bridge wire onto the GTM seal to achieve a customized electrical resistance rating. Fully automatic processes guarantee tight tolerances, with 100% automatic testing included.

Fusite's initiator technology is used when highly reliable and precise pyrotechnic ignition is needed. Our initiator components are used in the squib explosive devices found in the infrared (IR) flare housings that are used as countermeasures for decoying heat-seeking incoming missiles as well as for propulsion in chaff cartridge case assemblies that release radar reflecting materials for the protection of aircraft from ground radars.

Typical Specifications

  • Glass-to-metal seal lapping flatness < 0.001 mm
  • Surface finishes < Ra 0.8 µm.

Press fitting or welding into customized housings
Fusite provides in-house resistance welding and press-fit processes to assemble the GTM seals into customized cartridge cases. Housings are made of aluminum, stainless steel, or nickel-plated cold-rolled steel.

Surface coatings for high-end corrosion protection
In accordance with MIL standards, Fusite offers high-end coating or plating of components, including aluminum chromate plating per Def. St. 03-18 and high corrosion-resistant nickel plating.

Initiator Components