Critical Environment Technologies
    Combustible Gases

    Propane

    C₃H₈

    Propane (C₃H₈) is a three-carbon alkane commonly used as a fuel for heating, cooking, vehicles, and as a refrigerant (R-290). As LPG (liquefied petroleum gas), propane is stored and transported as a liquid under moderate pressure. Propane is colorless and naturally odorless—ethyl mercaptan is added as an odorant for leak detection. With a GWP of only 3, propane (R-290) is increasingly used in commercial refrigeration as an environmentally responsible alternative to HFC refrigerants. However, propane is highly flammable (Class A3 refrigerant) with LEL of 2.1% and UEL 9.5%, requiring appropriate safety measures, charge limits, and leak detection for refrigeration applications.

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    Key Information

    Essential safety and exposure information for Propane

    Health Effects

    • Highly flammable and forms explosive mixtures with air at concentrations between approximately 2.1% and 9.5% by volume
    • Not toxic, it poses an asphyxiant risk by pushing oxygen out of the air when it accumulates in enclosed spaces
    • Signs of exposure include headaches and dizziness, nausea and fatigue, difficulty breathing, skin numbness or frostbite from liquid contact

    Common Sources

    • Propane heating systems
    • Commercial kitchens
    • Forklifts
    • Vehicles
    • Cylinder storage rooms
    • Refrigeration (R-290)
    • Industrial processes

    Exposure Limits

    OSHA PEL
    1,000 ppm TWA
    NIOSH REL
    1,000 ppm TWA
    ACGIH
    Simple Asphyxiant, Explosion Hazard

    Regulatory Status

    Propane (R‑290) is classified by the EPA as a non‑toxic, highly flammable gas and SNAP‑approved low‑GWP refrigerant, and by ASHRAE Standard 34 as an A3 (lower toxicity, high flammability) refrigerant.

    Detection Requirements

    Sensor Technology
    Catalytic Bead or Infrared (NDIR)
    Sensor Range
    0-100% LEL
    Alarm Setpoints
    Low 10% LEL, Mid 15% LEL, High 25% LEL
    Mounting
    Near floor level (heavier than air)

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