​​EBW Pressure Initiator​

  • EB​​W = Exploding Bridge Wire
  • 100% BKNO3
  • Dimensions and output performance are the same as mil-spec hotwire initiators.
  • Inherently safer compared to hotwire devices.
  • Can replace TBIs (Thru-Bulkhead Initiators)
  • Designed to meet requirements of MIL-DTL-23659, Class B device.
  • Meets energetic materials requirements of MIL-STD-1901 for in-line high voltage devices, using only listed/approved propellant and containing no primary or secondary HIGH explosives. There is no ZPP, lead azide/styphnate or PETN in these devices.
  • Applications include:
    • Pressure initiator for in-line/high voltage systems for flight and other critical applications
    • Substitute for EFIs in systems where the igniters cannot be close enough to the FireSet or distributed systems with one FireSet/electronic sequencer and multiple initiators & detonators. EFIs & EBWs may be mixed in such a system.
    • Tested to greater than 22,000 PSI post shot pressure
    • Safer test substitute for hot wire initiators
  • DOT Shipping Classification: UN0255, 1.4B in approved packaging.  ​

Thread sizes.375-24 x .300” long, (also 7/16-28, ½-20, 9/16-18, 5/8-18 thread & others)
Connection optionsTwo bare pins; high voltage parallel wire or coax; bayonet or triple start 38999 type connectors
ConstructionHermetic: 304L stainless housing, glass to metal compression seals, welded stainless closure
Temperature-65°F to +180°F
Output closureWelded stainless, petaling (FOD free) or plain closure
Leakage1.0 x 10-6 std. cc/sec Helium at 1 atm. pressure
Peak Pressure500-1500 psi in 10cc volume (other pressures available)
Post fire pressure capability>22,000 psi. after passing 10-8 std. cc/sec He
ESD25kV, 500pf, 500 ohm
FireSet RequirementsHigh Voltage Capacitive Discharge Firing Unit- Various


Caution: While EBW and EFI Initiators are inherently less susceptible to accidental detonation during handling and set-up than devices containing primary explosives, electrical and electronic firing systems are sensitive to transient electrical energies which could cause premature triggering or firing. The blasting area must be clear of personnel and equipment before the detonator leads are connected to any RISI Firing System. Only approved RISI Firing Systems should ever be used to initiate or detonate any explosive product manufactured and authorized for sale by RISI.


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