How are fireproof material standards divided?

How are fireproof material standards divided?

Fireproof material composition:

1. Inorganic binders: mainly water glass, gypsum, phosphate, cement, etc.;

2. Refractory mineral fillers: alumina, asbestos powder, calcium carbonate, perlite, Taibai powder, etc.;

3. Flame retardant organic resins: mainly polyvinyl chloride, perchloroethylene, chlorinated rubber, neoprene latex, epoxy resin, phenolic resin, etc.

4. Fire retardant additives: mainly include organic compounds containing phosphorus, halogen and nitrogen (chlorinated paraffin, tributyl phosphate, decabromodiphenyl ether), and boron series (boric acid, zinc borate, aluminum borate), antimony series , aluminum, zirconium and other inorganic compounds.

Classification of fire protection materials:

my country's national standard GB8624-97 divides the combustion performance of building materials into the following grades:

Class A: Non-combustible Building Materials: Materials that hardly burn.

Grade B1: Flame retardant building materials: flame retardant materials have a good flame retardant effect. It is difficult to catch fire in the air or under the action of high temperature, and it is not easy to spread quickly, and the combustion stops immediately when the fire source is removed.

Class B2: Combustible building materials: Combustible materials have a certain flame retardant effect. When exposed to open fire in the air or under the action of high temperature, it will immediately catch fire, which may easily lead to the spread of fire, such as wooden pillars, wooden roof trusses, wooden beams, wooden stairs, etc.

Grade B3: Flammable building materials: without any flame retardant effect, it is extremely flammable and has a great fire hazard.