When Milliseconds Matter™

Hydrogen Burn Off Igniters.

ROFI | Liquid Fuel Engine | HBOI | LOX Engine


Hydrogen Burn Off Igniters

How Hydrogen Burn Off Igniters Work

Hydrogen Burn Off (HBO) Igniter utilizes an electrical input stimulus that ignites an Electro-Explosive Device (EED) which in turn ignites a propellant grain. The propellant grain is designed to sustain a controlled burn for a specified amount of time (minimum of 22 seconds), As the propellant grain burns, it produces hot pyrotechnic particles which are propelled and exited through a nozzle in a cone pattern over a required distance (minimum of 15 feet). Propellant burn time duration and throw distance can be customized to meet specific customer application needs.


HBO Igniters provide output of hot pyrotechnic particles used to prevent the accumulation of hydrogen gas on the launch pad during the starting process of Liquid Hydrogen/Liquid Oxygen (LOX) rocket engines. HBO igniters can be used where ejection of hot pyrotechnic particles will provide a means to solve other applications.


PacSci EMC HBO Igniters are qualified and currently used to support the safe launching of various U.S. and International space vehicles.

  • NASA’s Space Shuttle
  • United Launch Alliance (ULA) Delta IV Rocket
  • Mitsubishi Heavy Industries (MHI) H2 Rocket


  • Output

    Provide pyrotechnic sparks of at least +1,500°F

  • Throw

    Eject hot particles a minimum distance of 15 feet, and a cone angle of approximately 20°

  • Duration (Burn Time)

    Minimum 22 seconds

  • Operational Temperature

    -20°F to +160°F

  • Hermetic Sealing

    1 x 10-5 cc/sec of helium with one atmosphere differential pressure

  • All-fire Stimulus

    4.0 amperes with a 20 millisecond pulse

  • No-fire

    1.0 ampere / 1.0 watt for 5.0 minute

  • Insulation Resistance

    Greater than 2.0 megaohms at 500 volts direct current

  • Applicable Specifications

    Motor Igniter qualified to MIL-STD-1576
    Initiator qualified to MIL-I-23659


Hydrogen Burn Off Igniters Technical Envelope


Need more information or have a specific requirement you would like us to meet?
Please submit your information here or for immediate assistance call (888) 995-5659.

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