Refractory materials refer to materials that can prevent or block the spread of flames, and are often used in engineering construction. Common refractory materials include inorganic binders, refractory mineral materials, flame-retardant organic resins, flame-retardant fire-resistant additives, etc.
Inorganic adhesives: mainly include water glass, gypsum, phosphate, cement, etc;
Refractory mineral fillers: alumina, asbestos powder, calcium carbonate, perlite, talcum powder, etc;
Refractory organic resin: mainly including PVC, perchloroethylene, chlorinated rubber, chloroprene rubber lotion, epoxy resin, phenolic resin, etc.
Refractory and fire-resistant additives: mainly include organic compounds containing phosphorus, halogens, and nitrogen (chlorinated paraffin, tributyl phosphate, decabromodiphenyl ether), as well as inorganic compounds such as boron (boric acid, zinc borate, aluminum borate), antimony, aluminum, zirconium, etc.
1, Classification of Combustion Performance Grades for Building Materials and Building Decoration Materials
The combustion performance of building materials refers to all physical and chemical changes that occur during combustion or exposure to fire. This performance is measured by the characteristics of the material surface, such as ignition and flame propagation, heat generation, smoke emission, carbonization, weight loss, and the production of toxic products. The national standard GB8624-97 in China classifies the combustion performance of building materials into the following levels.
Grade A: Non combustible building materials: materials that almost do not ignite.
B1 level: Flame retardant building materials: Flame retardant materials have good flame retardant properties. It is difficult to catch fire when exposed to open flames in the air or under high temperature, and it is not easy to spread quickly. When the fire source is moved away, the combustion immediately stops.
B2 level: Combustible building materials: Combustible materials have a certain flame retardant effect. When exposed to open flames or high temperatures in the air, it will immediately ignite and burn, which can easily lead to the spread of fire, such as wooden columns, wooden frames, wooden beams, wooden stairs, etc.
B3 level: Flammable building materials: have no flame retardant effect, are highly flammable, and pose a great fire hazard.
