How to buy high -quality refractory materials for refractory fire brick users is important. Nowadays, there are hundreds of refractory quality on the market, but the quality of the material is indeed uneven. How do users buy genuine good goods. Users can first allow manufacturers to provide a certain sample before buying refractory bricks. Customers can determine the advantages and disadvantages of the product based on the following indicators.
Detection project for fire -resistant pouring materials
The main chemical composition content, pressure resistance, folding strength, folding strength, burning back line change rate, volume density.
Refractory fire brick appearance inspection
1. Why the error of large and small heads allows 1mm, the length error allows 2mm, and the height error allows 1%. Because the large and small head error can be adjusted by mash, the length error 2mm can be adjusted through the expansion cardboard and mash on the side of the brick. The height allows 1%, which is a form of representation. There are three different heights used in the group kiln: 200mm, 220mm, and 250mm. The error limit of different height bricks is different, but it cannot exceed 2-2.5mm. In general, we should control 1-1.5mm. This error is also adjusted by fire mud.
2. Flatness: Control at 0.5mm. Explanation: The degree of flatness of the large surface of the brick is used to detect the large surface of the brick. The commonly used ruler specifications are 0.1, 0.2, 0.25, 0.3, 0.4, and 0.5. The flatness of the refractory fire brick cannot exceed 0.5mm. In terms of operation, we should control it at 0.2-0.3mm. It can be explained that the brick's flatness is not good through a 0.5mm pluggical ruler. A few boxes should be opened and a few more pieces (this is because the standard value of more than 0.5mm is crushed when sealing; the bricks are easily crushed; Due to the rotation of the kiln in the kiln, the large surface of the bricks is squeezed with each other, and it is prone to cracking.) If this is the case, it should be contacted with the supplier. plan. And the supplier promises the quality of the use of these bricks.
3. Weight: The theoretical single weight of refractory fire brick can be calculated or provided by manufacturers. The actual weight of the brick is compared with the theoretical weight to estimate the density of refractory bricks. Explanation: The weight deviation of bricks is appropriate. If the size of the fire -resistant brick may be large or moisture; it lightly indicates that the pores are large, the texture is loose, and the standard density cannot be achieved.
