MOLDING SAND
The general sources of receiving molding sands
are the beds of sea, rivers, lakes, granulular elements of rocks, and deserts.
The common sources of molding sands available in India are as follows:
1. Batala
sand ( Punjab)
2. Ganges
sand (Uttar Pradesh)
3. Oyaria sand (Bihar)
4. Damodar and Barakar sands (Bengal- Jharkhand Border)
5. Londha sand (Bombay)
6. Gigatamannu
sand (Andhra Pradesh) and
7. Avadi and Veeriyambakam sand (Madras)
Molding sands may be of two
types namely natural or synthetic. Natural molding sands contain sufficient
binder. Whereas synthetic molding sands are prepared artificially using basic
sand molding constituents (silica sand in 88-92%, binder 6-12%, water or
moisture content 3-6%) and other additives in proper proportion by weight with
perfect mixing and mulling in suitable equipments.
