Generally, chemical reagents with a flash point below 25 ° C are listed as flammable chemical reagents. Most of them are highly volatile liquids, which can be burned in case of open flame. The lower the flash point, the easier it is to burn. Common flash points below -4 ℃ are petroleum opened, chloroethane, condensed ethane, ether, gasoline, carbon dioxide, propylene, benzene, ethyl acetate, acetic acid methyl alcohol. When using Yiene chemical reagents, open flame power must not be used. The heat can not be directly heated by the heater. Generally, it is not heated by a water bath. Such chemical reagents should be stored in a cool and ventilated place. When placed in the refrigerator, you must use an explosion-proof refrigerator. Ether has been stored in a general refrigerator and caused a fire. The accident of burning the whole laboratory, in places where such chemical reagents are used in large quantities, keep good ventilation at once, and the electrical appliances used must use explosion-proof electrical appliances. There must be no open flames on site. Flammable reagents can also cause an explosion when they burn violently. Some solid chemical reagents such as: nitrocellulose, picric acid, trinitrotoluene, trinitrobenzene, azide or overlapping compounds, cholate, etc. are themselves explosive. In case of heat or open flame, they can easily burn or decompose and explode. When using these chemical reagents, they must not be directly heated. When using these chemical reagents, be careful not to have an open flame around. There is also a class of solid chemical reagents, which can react violently with water and emit a lot of heat, which can also cause an explosion. Such chemical reagents include metal potassium, sodium, lithium, calcium, aluminum hydride, calcium carbide, etc. When using these chemical reagents, it is necessary to avoid direct contact with water. Some solid chemical reagents can undergo strong oxidation upon contact. Such as yellow phosphorus; some contact with oxidants or heat, shock or friction in the air can cause rapid combustion or even explosion. Such as phosphorus sulfide, red phosphorus magnesium powder, zinc powder, aluminum powder, hibiscus, brain drop, etc., when using these chemical reagents, you must pay attention to the ambient temperature not too high (generally not exceeding 30 ℃, preferably at 20 ℃ (Below) Do not contact with strong oxidants. Experimenters using flammable chemical reagents should wear the necessary protective equipment, preferably wearing protective glasses.
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Safe use of flammable and explosive chemical reagents