Coated Sand Casting VS Resin Sand Casting

Coated sand mould casting and resin sand mould casting are two casting methods that are more and more widely used. In actual casting production, they are increasingly used to replace clay green sand casting.

Although there are some similarities between resin sand and coated sand, for example, chemical components are added to the molding sand. Both of them could be divided into sand casting process. However, their difference is also very obvious. Resin sand is self-hardening sand, cold hardened, and hardened with a curing agent or catalyst; while coated sand is thermal hardened and hardened by heating.

Coated Sand Casting
The coated sand casting is also called shell mould casting in some Chinese foundries. The surface of the sand particles of the coated sand is covered with a layer of solid resin film molding sand or core sand before making mould. Preheat the sand to a certain temperature, add resin to melt, stir to coat the surface of the sand particles, add urotropine aqueous solution and lubricant, cool, crush, and siev to obtain coated sand with enough hardness to withstand the molten metals.

Resin Sand Casting
Resin sand casting is to mix raw sand, resin and curing agent evenly and put them into the sandbox and pattern to make the core. It uses furan resin and curing agent to make the sand compact and hard enough. Then close the box for casting.