Introduction to the fire rating of gypsum board

What is the fire rating of gypsum board? Gypsum board is a common material for decoration, usually used in partition walls and ceilings, so the fire rating is very important, which is related to the safety of life. In the previous class, we have learned about Dachen gypsum board fire protection system, So what is the fire rating of gypsum board? Let's take a look at the introduction of the fire rating of gypsum board.

One: CaSO4·2H2O, calcium sulfate dihydrate, do not underestimate these two crystal waters, the crystal water of gypsum board is an important reason for its fire prevention. When the gypsum board is exposed to fire, the free water in the core of the board first evaporates, absorbing a small amount of heat and reducing the temperature around the board. When the temperature continues to rise, the crystallization water of dihydrate gypsum begins to separate and decompose into gypsum and water. This process needs to absorb a lot of heat, which can affect the heating around the board surface for a long time.

Second: Additives. The main reason for the fire failure of the gypsum board is that the dihydrate gypsum shrinks in volume and loses its integrity to become powder after removing the crystal water. In order to improve the fire resistance of the gypsum board, some additives must be added to the gypsum board core.

Dachen refractory gypsum board has added refractory materials that expand in case of fire and a large number of refractory glass fibers, so that the overall volume can remain unchanged while the gypsum shrinks, and the gypsum core materials can be tied together so as not to lose wholeness.

Fire rating of gypsum board

The flammability grades of building decoration materials should be divided into four grades: grade A, non-combustibility; grade B1, flame retardant; grade B2, flammability; grade B3, flammability. Select the material to choose the B1 level or above.

1. Gypsum board is a flame-retardant B1 grade product, and there is also a text in the national standard "Code for Fire Protection of Internal Design of Buildings": the gypsum board installed on the light steel keel can be used as a grade A.

2. For the fire resistance limit requirements of the wall and other components in the national fire protection code, it is not simply to say whether the gypsum board can meet a certain fire resistance limit requirement. This is a systematic concept. It is clearly stipulated in the national standard GB/T 9775-2008 "Paper Surface Gypsum Board" that the fire stability of refractory gypsum board should be greater than 20 minutes. Among them, Dachen refractory gypsum board has a fire stability of more than 40 minutes.

3. The gypsum board fire protection system is composed of refractory gypsum board, light steel keel and various auxiliary materials. The type of gypsum board used, the quality of the gypsum board, the number of layers of the gypsum board, the quality and installation method of the keel, whether it is filled with rock wool and the bulk density of rock wool, the method of joint treatment, and the treatment of some details will greatly affect the system. fire performance. Therefore, the Dachen gypsum board fire protection system must use the light steel keel matched with the gypsum board, and cooperate with the decoration suggestions and installation methods of Dachen New Materials. Such a complete set of firewall system can relieve your worries.

The above introduction is about the fire rating of refractory gypsum board. I hope it will help you. When choosing materials, you must pay attention to the fire rating, so as to add a layer of protection to the life safety of you and your family.