A Grade External Wall Insulation Material
China's national standard GB8624-97 divides the combustion performance of building materials into the following grades
A Grade: nonflammable building materials: Almost no burning material occurs.
B1 Grade: Refractory Material: combustible materials have good flame retardant effect. It is difficult to catch fire in the air or under high temperature, and it is not easy to spread quickly, and the ignition stops immediately after the fire source is removed.
B2 Grade: flammable building materials: combustible materials have a certain flame retardancy. In case of fire or air will immediately burst into flames at high temperature, easily lead to the spread of fire, such as wood, wooden frame, wooden beams, wooden stairs etc..
B3 Grade: flammable building materials: no flame retardant effect, very easy to burn, fire danger is great.
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