What are the hazardous substances in the laboratory and what can be divided into several levels

It is divided into five categories according to the nature of combustion and **

1. Class A is flammable and explosive dangerous goods, and the fire hazard is very great, such as explosives, strong oxidants, liquids with a flash point (closed cup method) of less than 28, and gases with a lower limit of less than 10% of the gas content caused in the air.

2. Class B is flammable with greater fire hazard, such as oxidants, items that are slowly oxidized in the air and spontaneously combusted, liquids with a flash point (closed cup method) of 28 60, and combustible gases with a lower limit of more than 10%.

3. Class C is an organic combustible with a certain fire hazard, such as bamboo, wood, paper, and combustible liquids with a flash point (closed cup method) greater than 60.

4. Class D is a refractory material with less fire risk.

5. Class E is non-combustible materials without fire hazard. It is used to determine the fire resistance level and fire protection measures of the building in the fire protection design of the building.

Fire Precautions:

1. Don't panic: When a fire occurs, you must stay calm, don't panic, make a mess, blindly get up and run away or jump off the building.

2. Avoid shouting blindly: Because a large number of flammable and combustible materials such as wood, plastic, and chemical fibers are used in the interior decoration of modern buildings, and the surface of the decoration materials is often painted with paint, a large amount of smoke and toxic gases will be emitted when burning, which is easy to cause suffocation and death of toxic gas.

3. Don't be greedy for property: Don't waste time trying to get dressed or looking for valuables when escaping, and don't be under pressure to take away your belongings. Don't be greedy for money, you have already fled the fire and returned to the fire.

There are four categories, namely: light hazard level, medium hazard level, severe hazard level and warehouse hazard level.

Light hazard level: senior buildings, toddler buildings, building heights.

It is a hotel and office building of 24m or less. Buildings with closed systems only in the corridors, etc.

Medium hazard level: high-rise buildings for Minxun Bridge: hotels, office buildings, comprehensive buildings, postal buildings, financial and telecommunications buildings, command and dispatch buildings, radio and television buildings (towers), etc.

Serious hazard level: material preparation and workshop of printing plants, alcohol products, combustible liquid products, etc. Flammable liquids.

Spray operation area, solid flammable materials.

Combustible aerosols.

Products, solvents, paints, asphalt products and other factories and production workshops, studios, stage "grape trellises" lower.

Warehouse hazard level: Slow Chang sells food, tobacco and alcohol, wooden boxes, non-combustible and incombustible items packaged in cartons, and shelves in warehouse-type shopping malls. Wood, paper, leather, grains and products, cotton, wool, linen, silk and chemical fiber and products, household appliances, cables, Group B plastics and rubber and their products, steel-plastic mixed material products, non-combustible materials packaged in various plastic bottles and boxes, and warehouses where all kinds of items are mixed and stored.

The highest fire hazard in laboratories is Class A. At room temperature, it is affected by water or water vapor in the air to produce combustible gas.

and substances that cause combustion or **; In case of acid, heat, impact, friction, catalysis, and flammable inorganic substances such as organic matter or sulfur.

It is a strong oxidant that can easily cause combustion or **.

Substances that can cause combustion or ** when they are impacted, rubbed or in contact with oxidants and organic sedan materials; Production in a closed plant with an operating temperature greater than or equal to the spontaneous ignition point of the substance itself.

What you need to know about the degree of initiation.

The dust, fibers, and fog droplets of combustible substances in the production are suspended in the air and mixed with the air, and when they reach a certain concentration next to a hole, they are immediately caused by the fire source. These tiny substances surface adsorb and surround oxygen.

When the temperature increases, it accelerates its oxidation reaction.

The heat emitted in the reaction causes it to burn. These fine combustible substances have a lower spontaneous ignition point than the original lumpy solids or larger liquids, and under the right conditions, burn at the highest rate after ignition.