Sound insulation cotton grade standard.
Update:Apr 22,2024
Summary:Sound insulation cotton grade standard Class A, incombustible building materials, materials that hardly burn. A1 level, non-combustible, no open flame......
Sound insulation cotton grade standard Class A, incombustible building materials, materials that hardly burn.
A1 level, non-combustible, no open flame
A2 level: non-combustible, smoke should be measured and qualified.
B1 grade, flame retardant building materials: flame retardant materials have 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 after the fire source is removed.
1. 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 will easily lead to the spread of fire, such as wooden columns, wooden frames, wooden beams, wooden stairs, etc.
2. Class B3: Flammable building materials, which have no flame retardant effect, are extremely flammable and have great fire risk.
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