Resin Coated 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 blowholes and devoid of casting defects. It is one of the best molding sands for cars, tractors and hydraulic parts. This method is now popularly used in core-making and molding processes in the 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 hexamethylenetetramine (hexa) cross-linker and other additives specific to the core or mold-making process.
- The advantages of ceramic sand for Resin Coated:
Higher refractoriness—-to cast metals with high pouring temperature (cast steel, alloyed cast steel, stainless steel, etc.) - High strength and toughness—–to produce more complicated cores with thin sections.
- Lower thermal expansion—–to avoid expansion defects
- Higher reclamation yields—-to reduce waste sand disposal, to decline costs.
- Excellent flowability —–to make complicated cores.
- Lower binder consumption—–lower gas evolution，lower manufacturing costs
- Inert chemical characteristics—–can be applied in any popular alloys，includes Manganese steel.
- Longer storage period.
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