Castable is a kind of granular and powdery material made of refractory, which is composed of a certain amount of binder and water. Today I will explain to you how to solve the expansion of refractory castable.
The addition amount of aluminum dihydrogen phosphate should be controlled at 13% ~ 15%, but the liquid aluminum dihydrogen phosphate will react with the metal iron in the refractory to generate hydrogen at room temperature, which will expand the poured lining and form a porous loose body. Then it is because the cement contains a certain amount of metal iron. Therefore, anti bulging inhibitor (Concealer) must be added, or liquid potassium dihydrogen phosphate must be added twice when the castable is mixed. The specific method is to add 6% ~ 7% potassium dihydrogen phosphate to the castable mixture at one time and store it in a semi wet state for 24 hours. Before the secondary addition of potassium dihydrogen phosphate, add 2 ~ 3% coagulant, mix the materials evenly, then add the remaining 6 ~ 7% potassium dihydrogen phosphate solution, mix evenly and pour. Generally, it can prevent expansion.


For more details or questions, please call the company’s hotline + 0531 85800088 or through the online customer service website, or leave your contact information. We have technicians to solve the problems related to high temperature materials for you at any time.

Shandong redon high temperature materials Co., Ltd. has domestic high-end production equipment and reliable production technology, with an annual output of 1050 ceramic fiber series products, 1260 ceramic fiber series products, 1400 ceramic fiber series products and 1600 polycrystalline series products of more than 10000 tons. There are more than 30 kinds of products in different forms, such as cotton, blanket, felt, board, paper, various textiles, profiled products, modules, folding blocks, castables, spraying and so on, which can meet the heat insulation requirements of different situations in the high temperature field. Welcome to click the online service at the bottom right of the website or submit an online inquiry. We will contact you as soon as possible.