One of the most important physical properties of chirook foundry sand is perfect spherical grain. Due to this matter , it has high permeability , high ability for passing gas , excellent flow ability , ability to fill all corners of mold , and at last but not least excellent collapsibility.
As a result of sintering point more than 1650 centigrade , chirook foundry sand has some abilities like ti endure high temperature , high refractory degree , good for casting heavy parts , and capability of recycling.
Another physical properties of chirook silica sand are the angularity coef-ficient( 1.3) and suitable grain size. So , it cause smoothness and uniformity in products surface and abdldty to pass away gas.

Furthermore , one of the most important chemical properties is never chemical