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  2. NFPA 704 - Wikipedia

    en.wikipedia.org/wiki/NFPA_704

    "NFPA 704: Standard System for the Identification of the Hazards of Materials for Emergency Response" is a standard maintained by the U.S.-based National Fire Protection Association. First "tentatively adopted as a guide" in 1960, [ 1 ] and revised several times since then, it defines the " Safety Square " or " Fire Diamond " which is used to ...

  3. Hazardous Materials Identification System - Wikipedia

    en.wikipedia.org/wiki/Hazardous_Materials...

    A sign that uses a yellow 'Instability' bar, which was never part of HMIS. ("Instability" is a NFPA 704 term.) Prior to 2002, with HMIS' third edition (HMIS III), both systems used the same colors, blue, red, yellow and white, and used the same criteria for 'flammability'/'Fire Hazard' and 'reactivity'.

  4. Template:NFPA 704 diamond/codes-overview - Wikipedia

    en.wikipedia.org/wiki/Template:NFPA_704_diamond/...

    Instability 2: Undergoes violent chemical change at elevated temperatures and pressures, reacts violently with water, or may form explosive mixtures with water. E.g. white phosphorus code

  5. List of highly toxic gases - Wikipedia

    en.wikipedia.org/wiki/List_of_highly_toxic_gases

    Many gases have toxic properties, which are often assessed using the LC 50 (median lethal concentration) measure. In the United States, many of these gases have been assigned an NFPA 704 health rating of 4 (may be fatal) or 3 (may cause serious or permanent injury), and/or exposure limits (TLV, TWA/PEL, STEL, or REL) determined by the ACGIH professional association.

  6. Placard - Wikipedia

    en.wikipedia.org/wiki/Placard

    A NFPA 704 symbol for Acetone. NFPA 704 is a standard developed by the National Fire Protection Association for warning first responders to hazards posed by hazardous materials stored in a building or facility. The signs are intended to be mounted on the exteriors of buildings, storage tanks and storage areas.

  7. Hazard symbol - Wikipedia

    en.wikipedia.org/wiki/Hazard_symbol

    The sign is commonly referred to as a radioactivity warning sign, but it is actually a warning sign of ionizing radiation. Ionizing radiation is a much broader category than radioactivity alone, as many non-radioactive sources also emit potentially dangerous levels of ionizing radiation.

  8. Template:NFPA 704/doc - Wikipedia

    en.wikipedia.org/wiki/Template:NFPA_704/doc

    This template produces a NFPA 704 safety square with optionally four hazard codes. It is designed to be used in a table. It is designed to be used in a table. Primary use is through {{ Chembox }} , the {{ NFPA 704 }} box and {{ OrganicBox complete }} (chemical data pages).

  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.

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