Sodium silicate is a generic name for chemical compounds with the formula Na2SiO3. This material is generally colorless transparent solids, or in white powder, non toxic and non-inflammable. It is suluble in water in various amount. A more common name for sodium silicate is water glass, which is used in the iron or steel sand casting. The water glass works as a binder of the sand. It allows the rapid production a strong sodium silicate sand casting mold, by CO2 through the mixture of sand and sodium silicate in the mold, which hardens it almost instantly.
Basic Property of Sodium Silicate Casting Product
dimension tolerance ±0.5mm, CT7~8.
surface finish Ra3.2.
wall thickness up to 7mm.
unit weight extent 1~20000kg.
unit size limitation 0.03~3.5 meter.
degree of complexity- complex.
machining required- normal
production lead time- short.
production cost- low.
Notice of Sodium Silicate Sand Casting
Though in most conditions, sodium silicate sand casting is considered to be investment casting, but actually it also could be applied in the sand casting. Besides, sodium silicate sand casting is more suitable to make the large and complex structures and with even better surface finish and less defects.
Principle of Sodium Silicate Casting
The principle of sodium silicate casting industry and the detailed steps: melt the glass and mold it through the mold. Generally realize that after the mold is made, the glass melt is injected into the mold or realize that the pre-made mold is stacked with glass scrap in the mold, and put into the furnace together with the mold for melting, and anneal the mold with the glass domain anastomosis after molding.
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