1. Class A1: Non-combustible building materials, materials that hardly burn, no open flames, and smoke and dust.
2. Class A2: non-combustible building materials, materials that hardly burn, and will produce a lot of smoke and dust.
3. Class B1: flame retardant building materials, flame retardant materials have good flame retardant effect. It is difficult to catch fire when exposed to open flame or high temperature in the air, and it is not easy to spread quickly, and it will stop burning immediately when the fire source is removed.
4. Class B2: Combustible building materials, combustible materials have a certain flame retardant effect. When it encounters an open flame in the air or under the action of high temperature, it will immediately catch fire and cause the fire to spread, such as wooden pillars, wooden beams, wooden stairs, etc.
5. Class B3: flammable building materials, without any flame retardant effect, extremely flammable, and a great fire hazard.
Second, in fact, the grade B1 of the flame-retardant board lies in GB8624-1997 "Classification of Combustion Performance of Building Materials", and the current flame-retardant grade standard is mentioned in GB8624-2006 "Classification of Combustion Performance of Building Materials and Their Products" .
The classification of building materials in "Classification of Combustion Performance of Building Materials" includes: Class A is non-combustible materials, Class B1 is flammable materials, Class 2 is combustible materials, and Class B3 is flammable materials. According to the standard in "Classification of Combustion Performance of Building Materials and Their Products" in 2006, building materials can be divided into seven levels: A1, A2, B, C, D, E, and F.
According to the B and C grades in the 2006 standard, it can correspond to the B1 grade in the 1997 standard. It means that B1 grade can be B grade and C grade, but B grade is B1. From this point of view, B-grade panels are better than B1-grade panels to some extent.
6. Acrylic sheet or acrylic mirror sheet without special treatment, the fire rating is B3, the material itself is not flame retardant, the fire rating of acrylic sheet is very low, if special treatment with flame retardant is added, higher flame retardant can be achieved The level can reach B1 level. Flame-retardant acrylic refers to the acrylic plate that does not burn or burns slowly when it meets the flame and extinguishes itself when it leaves the flame. Compared with other ordinary plates, its flame-retardant effect will be better. Once a fire breaks out, even if it burns, it will not be so fast, it will burn out, and it can be extinguished quickly after burning. If it is an ordinary material, it will not self-extinguish, it will only burn out quickly, so the Acrylic panels are not fireproof at all.