How is the grade of sound insulation cotton distinguished?

Did you know that sound insulation cotton is graded? How to distinguish the grade of sound insulation cotton? Let’s find out together:

Class A: non-combustible building materials, materials that hardly burn;

A1 level: no combustion, no open flame;

A2 grade: non-combustible, to measure smoke, to be qualified;

Grade B1: Flame-retardant building materials, flame-retardant materials have a good flame retardant effect, they are difficult to catch fire in the air or under the action of high temperature, are not easy to spread quickly, and burn when the fire source is removed stop now.

Class B2: Combustible building materials, flammable materials have a certain flame retardant effect, they will immediately catch fire and burn when exposed to open fire in the air or under the action of high temperature, which is easy to cause the spread of fire, such as wooden pillars, wooden roof trusses, wooden beams, Wooden stairs etc.

Class B3: Flammable building materials, without any flame retardant effect, are extremely flammable and have a great fire hazard.