Mullite sand powder for casting

      Mullite sand powder for casting are manufactured from high-quality aluminosilicate raw materials, typically derived from kaolin and converted into mullite through high-temperature calcination. The final product consists predominantly of mullite (3Al₂O₃·2SiO₂) and exhibits excellent chemical stability, making it ideal for precision casting applications.
      In the precision casting process, the surface sand material directly determines the surface roughness and forming accuracy of the casting. Mullite powder, due to its excellent high-temperature resistance and thermal stability, has become one of the most widely used surface layer materials in precision casting shell-making systems.
      Compared to ordinary silica sand, mullite powder is less prone to phase transformation and drastic volume changes at high temperatures, effectively preventing shell cracking, delamination, and surface defects in castings. Simultaneously, its excellent chemical inertness reduces the erosion of the mold shell by molten metal, improving the casting yield.

      This product can be used as a surface sand, or as a transition layer or fine powder filler layer according to process requirements, adapting to different casting structures and alloy systems.
      Mullite sand powder for casting is a surface refractory material specifically designed for use in precision casting processes. It is made from high-quality synthetic or sintered mullite through crushing, grading, sieving, or ultrafine grinding. This product is mainly used as a surface or transition layer in shell-making processes, playing a decisive role in the surface quality of castings.