Gypsum board belongs to B1 level of combustible materials, belongs to the refractory level of building materials. According to the classification of combustible grade of building materials in China, it includes:
1. Class A, non combustible.
2. Class B1, flame retardant.
3. Class B2, flammability.
4. Class B3, flammable.
Gypsum board has the characteristics of sound insulation, fire prevention and heat insulation, which is widely used in decoration.
