Factors for the Service Life of Ceramic Fiber Board

Ceramic fiber board has good properties and performance and is widely used in many industries. The followings are some factors for the service life of ceramic fiber board. 

1. The initial pressure

Ceramic fiber board is difficult to maintain the vacuum. The initial pressure of most boards is 10Pa. This vacuum degree is the typical target value. Maintain the vacuum degree in the board is the key factor determining the performance of VIP. 

 

2. Gas permeability of barrier films

The barrier film can effectively prevent air and vapor penetrating into the board, maintain the vacuum degree in the board and maintain the thermal conductivity of the VIP. Therefore, the selection of the barrier films is important for the performance and service life of VIP. 

 

3. Gas release of the core material and barrier films

Most materials will release gas in a vacuum environment, which will increase the pressure in the board. In some cases, the amount of released gas even exceeds the amount of gases in the board. Therefore, the selection of core material and barrier films affects or even determines the service life of VIP. 

 

4. Edge permeability of barrier films

All ceramic fiber boards are composed of core gas barrier layers formed by edge sealing with barrier films. However, since the edges are sealed by hot pressing, the edge sealing cannot barrier gases and vapor as well as the barrier film itself. 

 

5. The influence of the pressure increase on the core materials

The high heat resistance of ceramic fiber board relies on the vacuum degree. Its heat resistance decreases with the vacuum degree in the board. However, the increasing or decreasing of heat resistance is up to the type of core materials. The thermal conductivity of the core materials varies with the pressure. Therefore, the insulation performance of ceramic fiber board is quite different.