Resin Coated Ceramic Foundry Sand is a commonly used foundry material and a method in foundry practices, it produces castings of high precise dimensions, smooth surface, free of blow holes and devoid of casting defects. It is one of the best moulding sands for cars, tractors and hydraulic parts. This method is now popularly used in core-making and moulding processes in foundry, especially as the well-known “shell method”.
Resin Coated Ceramic Foundry Sand is a dry, pre-coated sand mix that is cured by heat. Sand is coated with a phenolic novolac resin along with a hexamethylene tetramine (hexa) cross-linker and other additives specific to the core or mold making process.
The Shell Method or “Croning process” was invented by Dr. Johannes Croning in Hamburg, Germany in 1944. This process is the oldest core and mold making technology that utilizes synthetic resins. Although many additional sand core and molding making technologies have since been introduced, the Shell Sand process using resin coated sand is still a very effective core and molding process today.
Ceramic Foundry Sand was firstly introduced into foundry industry in 1999. Ceramic Foundry sand, technically as fused ceramic sand for foundry, is made from calcined bauxite which main content is aluminum oxide, processed by melting, blowing, sieving and blending. Ceramic Foundry Sand has excellent properties, including spherical shape, high refractoriness, good crush resistance, inert chemical characteristics, high reclamation yields, etc. Ceramic Foundry Sand has distinguished performance in foundry in compare with silica sand and other popularly used special sands.