Silicates are used as binders to form molds and cores from sand, into which molten metal is poured. Sugars, carbohydrates and/or surfactants are usually added to the silicate to improve shakeout (removal of metal part from mold) and to obtain better sand reclamation. Silicates are mixed with sands and reacted with either CO2 gas or esters to set (acid-set systems). Silicates have these advantages:
- Quick, strong set with easy-to-handle materials
- Low VOCs during setting and pouring of metal
- Work with a variety of sand types and metals
- Easy storage and cleanup of materials
- Environmentally friendly system