1) Flash point <28 ℃ liquid. For example: acetone flash point -20 ℃, ethanol flash point 12 ℃.
(2) the lower limit of explosion & lt; 10% of the gas, as well as by water or water vapor in the air, can produce the lower limit of explosion & lt; 10% of the gas solid material. Such as: the lower explosive limit & lt; 10% of the gas butane explosive limit is 1.9%, methane explosive limit is 5.0%,; solid substances calcium carbide (calcium carbide) encountered in the reaction of water to produce an explosive limit & lt; 10% of the gas acetylene (calcium carbide gas), acetylene's explosive limit is 2.8-81%.
(3) at room temperature can decompose or oxidize in the air that can lead to rapid spontaneous combustion or explosion of the material.
such as: nitrocellulose, yellow phosphorus.
(4) room temperature by the role of water or water vapor in the air can produce flammable gases and cause combustion or explosion of the material. Sodium metal, potassium metal,
(5) acid, heat, impact, friction, as well as organic substances or sulfur and other flammable inorganic substances, is very easy to cause combustion or explosion of strong oxidizing agents. Such as: potassium chlorate, sodium chlorate,
(6) by impact, friction or with oxidizers, organic substances can cause combustion or explosion. Such as phosphorus pentasulfide, phosphorus trisulfide, etc. .
Category B: The fire hazard of this category is characterized by six points:
(1) flash point ≥ 28 ℃ to <60 ℃ liquid. Turpentine flash point 35 ℃, isobutanol flash point 28 ℃
(2) the lower limit of explosion ≥ 10% of the gas. Such as: ammonia, liquid ammonia, etc.
(3) does not belong to category A oxidizers. Such as: sodium dichromate, potassium chromate
(4) does not belong to category A chemical flammable hazardous solids. E.g., sulfur, industrial naphthalene
(5) Flammable gases. Such as: oxygen.
(6) at room temperature in contact with air can slowly oxidize, accumulate heat does not dissipate to cause spontaneous combustion.