How To Select Castables When Purchasing

Castables are currently the most widely used amorphous refractory materials in the refractory industry. There are many different products on the market. How do we judge their quality? Let me introduce to you the issues that you should pay attention to in the selection of castables: users using unshaped refractory materials, such as castables, plastics, etc., must first check their useful life. After unpacking the product, be sure to carefully check the factory date on the package. For products that exceed the prescribed period, the performance of the castable will decline.

The particle size, strength and composition of refractory castables have a very important influence on the quality of masonry. Check the particle size and shape, generally by visual method. For example, the size of the knotted induction furnace is preferably diamond-shaped and has sharp corners. The particle size strength can be determined by tapping with a wooden hammer and looking at the crushing situation. Check the size and composition of the particle size and use the screening method. The sieving method is carried out in the laboratory, and it can measure the composition of various particle sizes.

After confirming the raw materials used, this series of castables will go through a series of manufacturing processes to produce suitable castables, and then be cured according to appropriate methods. Finally, the structures will be put into use after proper baking. Because the construction process of the castable is also very important, extra attention should be paid to the amount of water added during the construction of the castable. The castables should contain a certain amount of water, and the specific amount of water added should be analyzed according to the actual situation. For example, calcium aluminate cement can be pre-mixed with a binder to make an aqueous solution and added to it. For those who need to hydrolyze in advance, this method is better.

The hardening speed of cement in refractory castables is closely related to the amount of water added. The most appropriate water-cement ratio should be selected at the peak of the water-cement ratio curve. Not only the type of cement, but also the shape and nature of the particles. During construction, in order to ensure the strength of the castable, the general water-cement ratio is controlled at about 0.4 to 0.6, and the moisture in the mixture is about 5% to 6%.

Of course, it is more important to choose high-quality castables according to the user's specific use. Rongsheng Kiln specializes in producing all kinds of high-temperature, wear-resistant casting materials, plastics, refractory bricks, etc., with preferential prices, independent production, and provides construction services, quality can be used with confidence. You are welcome to visit the company, our company has nearly two decades of technical experience and will recommend suitable products for you according to your needs!

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