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泥型用的涂料必須有好的耐火性,遇到高温铁水后不会产生很多的气体,同时它必須能紧紧的复盖在鑄型的表面,结成一层硬皮。这样才能阻止金属液的渗透,从而可以使鑄件表面光洁无疵。涂料的颗粒应很细,成粉末状。涂料中的胶附剂不能过多,否则在鑄型烘干时就要开裂,并且会从鑄型上剝落下来。同时在浇注时产生气体过多,鑄件会产生气孔。涂料中粘土含量也不能过多,不然会降低涂料的耐热性,总的說来涂料应該具备下列条件:
Mud coating must have good fire resistance, in the face of high temperature hot metal does not produce a lot of gas, at the same time it must be tightly covered in the mold surface, forming a layer of crust. In order to prevent the infiltration of liquid metal, which can make the casting surface clean and unblemished. Paint particles should be very fine, into a powder. Coatings in the adhesive agent can not be too much, otherwise it will crack in the mold drying, and will peel off from the mold. At the same time when casting too much gas, castings will produce pores. Coating clay content can not be too much, otherwise it will reduce the heat resistance of paint, paint in general should have the following conditions: