Chemical Inventory
Hazard Class DefinitionsCombustible Liquid- A liquid having a flash point at or above 100ºF (38º).
Compressed Gas: Any material or mixture that, when enclosed in a container, has an absolute pressure exceeding 40 psi at 21.1°C, or has an absolute pressure greater than 104 psi at 54.4°C, or any flammable material having a vapor pressure greater than 40 psi at 37.7°C. Compressed gases include liquefied petroleum gas.
Corrosives: Acids and bases or mixtures having a pH less than or equal to 2 or greater than or equal to 12.5, and materials that burn the skin or dissolve metals. Examples are strong mineral acids (chromic, sulfuric, hydrochloric, or nitric) strong alkalis (potassium hydroxide, sodium hydroxide), rust removers, and acid or alkaline cleaning fluids.
Cryogenics: Study of the behavior of matter at temperatures below –200 ºC. The use of the liquefied gases, oxygen, nitrogen, and hydrogen at approximately –260 ºC is standard industrial practice. Cryogens pose numerous hazards. For example, cryogenic vapors from liquid oxygen or liquid hydrogen may cause a fire or explosion if ignited. Materials that are normally noncombustible (e.g., carbon steel) may ignite if coated with an oxygen-rich condensate.
Explosives: Any substance, article, or device which is designed to function by explosion or which, by chemical reaction within itself, is able to function in a similar manner even if not designed to function by explosion.
Flammable Liquids: Liquids that have a flashpoint less than 100°F (38°C), e.g. acetaldehyde, acetone, glacial acetic acid, diethylamine, hexane, toluene, xylene.
Flammable Gas: Any material which is a gas at 20 ºC or less and 14.7 psi of pressure which is ignitable at 14.7 psi when in mixture of 13% or less by volume with air or has a flammable range at 14.7 psi with air of at least 12% regardless of the lower limit. Butane and acetylene are examples of flammable gases.
Flammable Solids: May cause a fire through friction; show a burning rate faster than 2.2 mm (0.087 inches) per second; or any metal powders that can be ignited and react over the whole length of a sample in 10 minutes or less. Naphthalene, matches, aluminum powder, and magnesium are examples of flammable solids.
Highly Toxic: A substance having an Oral LD50 (Lethal Dose, 50%) rats of <50 mg/kg; Skin contact LD50 rabbits of <200 mg/kg; Inhalation LC50 (Lethal Concentration, 50%) rats of <200 ppm for 1 hour; Inhalation LC50 rats of <2,000 mg/m3 for 1 hour.
Liquefied Petroleum Gas (LPG): Propane is a liquid stored under pressure in tanks and cylinders. Propane is flammable.
Organic Peroxides: Any organic compound containing oxygen in the bivalent structure and which may be considered derivative of hydrogen peroxide, which one or more of the hydrogen atoms have been replaced by organic radicals.
Oxidizing Gases: A gas which may, generally by providing oxygen, cause or contribute to the combustion of other material more than air does.
Oxidizers: Any compound that spontaneously evolves oxygen at room temperature or under slight heating. The term includes such chemicals as peroxides, chlorates, perchlorates, nitrates, and permanganates
Pyrophorics: Any liquid or solid that will ignite spontaneously in air at about 54.4 ºC. Titanium dichloride and phosphorous are examples of pyrophoric solids, tributylaluminum and related compounds are pyrophoric liquids.
Toxic: A substance having an oral LD50 rats of 50-500 mg/kg; Skin contact LD50 of 200 mg/kg – 1 g/kg; Inhalation LC50 rats 200 ppm – 2 ppb for 1 hour; Inhalation LC50 rats of 2,000 g/m3 – 20 g/m3 for 1 hour.
Unstable Reactive: A material, other than an explosive, which in the pure state or as commercially produced, will vigorously polymerize, decompose, condense, or become self-reactive and undergo other violent chemical changes, including explosion, when exposed to heat, friction or shock, or in the absence of an inhibitor, or in the presence of contaminants or in contact with incompatible material.
Water Reactive: A material that explodes; violently reacts; produces flammable, toxic or other hazardous gases; or evolves enough heat to cause self-ignition or ignition of nearby combustibles upon exposure to water or moisture.