Descriptions: Resin coated sand is a method in foundry practices and produces a casting of high precise dimensions, smooth surface, free of blow holes and devoid of casting defects.The surface of the sand is covered with a layer of solid resin film or sand. Cold and hot method of two kinds of coating process: cold method to dissolve the resin with ethanol, and in the process of mixing the mixture of urotropine, so that the two covered in the sand surface, the evaporation of ethanol, Method to preheat the sand to a certain temperature, add resin to melt, stir the resin coated on the sand surface, plus Urotropine aqueous solution and lubricant, cooling, crushing, screening coated sand. It is one of the best moulding sands for cars, tractors and hydraulic parts.
