Many people habitually look at the color first when buying fire brick. In fact, the appearance color of fire brick does not represent and determine the quality of the brick or its composition value.
When purchasing fire brick, many users often judge bricks by their appearance, and they are considered to be good bricks when they look at the uniform and smooth color. If the color distribution is uneven, and there are too many black spots, they are considered to be defective fire brick. There must be a problem in quality.
Now there are more and more fire brick on the market, it is dazzling to choose, and unprofessional buyers may also buy products of poor quality. Here I will teach you three secrets to help you quickly distinguish good from bad when choosing fire brick.
First, look at the impurity ratio of fire brick.
Generally speaking, impurities will be generated during the sintering process of fire brick in strict accordance with the proportion of ingredients. There is no perfect product, which does not affect the quality of the product. However, some manufacturers often do not produce according to the proportion of materials used, so that the sintered fire brick do not have a hard structure, so that the quality of the sintered bricks is not good enough, and finally deceive consumers with shoddy products and high prices. Then when you buy fire brick, you can check them by their surface. Generally, the surface of fire brick with high impurity content will be very rough, while the overall color of those fire brick with good quality is uniform and the surface is smooth and flat, which we can intuitively distinguish from the surface.
The second is the refractory brick sintering experiment, which is the most effective method.
Generally, when we buy fire brick, we will take samples for testing in advance. Especially before we decide to buy, we must let the manufacturer carry out a high temperature test to check whether the sintering index of the refractory brick is the same as the standard index. As long as the deviation of the experimental results is not large, the quality of the brick body still passes the test, which is also a good method.
Third, use the weighing method.
fire brick have their own specifications and bulk density, and the weight of a single block can be calculated. Because of the difference in aluminum content and production process, the unit weight of fire brick is different. After receiving the goods, the buyer can randomly select a few pieces for weighing, measure the weight and record it, and then bake the samples in a high temperature environment for a period of time to check the weight to see if there is any change in the weight. There is no change to prove that the supplier of the product is a trustworthy manufacturer. If the weight of the product changes, then you should be vigilant.
Therefore, when we choose fire brick, we cannot simply judge the quality of bricks by a certain standard. Instead, it is necessary to integrate various aspects, such as index content, load softening degree, bulk density, compressive strength and so on.
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