According to GB8624-2012 "Classification of Combustion Performance of Building Materials and Products", the fire rating can be divided into the following categories:
Class A: Non-combustible building materials.
A material that hardly burns.
For example: granite, marble, terrazzo, cement products, gypsum board, ceramic tiles, mosaics, etc.
Class B1: Flame retardant building materials.
Flame retardant materials have good flame retardant effects. When it encounters an open flame in the air or it is difficult to catch fire under the action of high temperature, it is not easy to spread quickly, and the combustion stops immediately after the fire source is removed.
For example: gypsum board, cement particle board, flame retardant plywood, flame retardant medium density fiberboard, fireproof plastic decorative board, flame retardant molded wood composite board, color fire retardant wood board.
Class B2: Combustible building materials.
Combustible materials have a certain flame retardant effect. In the air, when exposed to fire or under high temperature, it will immediately ignite and burn, which may lead to the spread of fire, such as wooden columns, wooden trusses, wooden beams, wooden stairs, etc.
For example: all kinds of natural wood, wooden wood-based panels, bamboo, paper decorative panels, decorative micro-thick wood panels, printed wood-grain panels, plywood, plastic wallpaper, composite wallpaper, natural materials wallpaper.
The grade and grade of the burnt material can be subdivided as follows:
Class A can be divided into A1 and A2 levels.
B1 level can be divided into B level and C level.
The B2 level can be divided into D level and E level.