1. The combustion function grades of stainless steel fireproof glass doors, building materials and building decoration materials are distinguished. The combustion function of building materials refers to all physical and chemical changes that occur when they burn or encounter fire. This function is determined by the ignitability and flame transmission, heat generation, smoke generation, carbonization and weight loss of the material surface, And the onset of toxic products. The combustion function of building materials is divided into the following grades in China's national standard gb8624-97

Class A: incombustible building materials: materials that hardly burn. Class B1: incombustible building materials: incombustible materials have good flame retardant effect. They are difficult to catch fire in the air in case of open fire or under the action of high temperature, are not easy to expand quickly, and the combustion stops immediately after the fire source is removed

Class B2: Combustible building materials: combustible materials have a certain flame retardant effect. They will catch fire immediately in case of open fire in the air or under the action of high temperature, which is easy to lead to the extension of fire, such as wooden columns, wooden roof frames, wooden beams, wooden stairs, etc

Class B3: flammable building materials: without any flame retardant effect, it is very easy to burn and has a great fire risk

2. Correct application of materials with different combustion function grades. Building materials used in buildings shall meet the requirements of national mandatory standards, which is the requirements of gb50222-95 fire prevention standard for building interior decoration planning "The interior decoration planning of the building shall properly deal with the opposition between the decoration function and the use of safety, actively use non combustible materials and non combustible materials, try to prevent the use of materials with a large amount of smoke or toxic gases during combustion, so as to be safe, applicable, technologically advanced, economical and reasonable."

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