Definition and meaning of sand casting

Sand Casting:

•Sand casting uses natural or synthetic sand (lake sand) which is mostly refractory material calsilica (SiO2)

•The sand grains must be small enough so that it can be packed densely; however, the grains must be large enough to allow gasses formed during the metal pouring to escape through the pores

•Larger sized moulds use green sand (mixture of sand, clay and some water). Sand can be re-used, and excess metal poured is cut-off and re-used also.

STEPS FOR SAND CASTING: