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  2. Lower flammability limit - Wikipedia

    en.wikipedia.org/wiki/Lower_flammability_limit

    The lower flammability limit (LFL), [1] usually expressed in volume per cent, is the lower end of the concentration range over which a flammable mixture of gas or vapour in air can be ignited at a given temperature and pressure. The flammability range is delineated by the upper and lower flammability limits. Outside this range of air/vapor ...

  3. Flammability limit - Wikipedia

    en.wikipedia.org/wiki/Flammability_limit

    Dusts also have upper and lower explosion limits, though the upper limits are hard to measure and of little practical importance. Lower flammability limits for many organic materials are in the range of 10–50 g/m 3, which is much higher than the limits set for health reasons, as is the case for the LEL of many gases and vapours. Dust clouds ...

  4. Combustibility and flammability - Wikipedia

    en.wikipedia.org/.../Combustibility_and_flammability

    The lower flammability limit or lower explosive limit (LFL/LEL) represents the lowest air to fuel vapor concentration required for combustion to take place when ignited by an external source, for any particular chemical. [29] Any concentration lower than this could not produce a flame or result in combustion.

  5. Limiting oxygen concentration - Wikipedia

    en.wikipedia.org/wiki/Limiting_oxygen_concentration

    Flammability diagram, green dotted line shows safe purging of an air-filled vessel, first with nitrogen, then with methane, to avoid the flammable region.The limiting oxygen concentration is shown in the lower right of the diagram.

  6. Flash point - Wikipedia

    en.wikipedia.org/wiki/Flash_point

    A certain concentration of a flammable or combustible vapor is necessary to sustain combustion in air, the lower flammable limit, and that concentration is specific to each flammable or combustible liquid. The flash point is the lowest temperature at which there will be enough flammable vapor to support combustion when an ignition source is ...

  7. UL 94 - Wikipedia

    en.wikipedia.org/wiki/UL_94

    UL 94, the Standard for Safety of Flammability of Plastic Materials for Parts in Devices and Appliances testing, is a plastics flammability standard released by Underwriters Laboratories of the United States. [1] The standard determines the material's tendency to either extinguish or spread the flame once the specimen has been ignited.

  8. Flammability diagram - Wikipedia

    en.wikipedia.org/wiki/Flammability_diagram

    The upper and lower flammability limits of methane in oxygen are located on the methane axis, as shown. The actual envelope defining the flammability zone can only be determined based on experiments. The envelope will pass through the upper and lower flammability limits of methane in oxygen and in air, as shown

  9. Hydrogen safety - Wikipedia

    en.wikipedia.org/wiki/Hydrogen_safety

    Hydrogen possesses the NFPA 704's highest rating of four on the flammability scale because it is flammable when mixed even in small amounts with ordinary air. Ignition can occur at a volumetric ratio of hydrogen to air as low as 4% due to the oxygen in the air and the simplicity and chemical properties of the reaction.