Learn about the basics of Casting Sand, Green Sand, and the uses of Casting Sand
Friday, October 3rd, 2008Green Sand: Green sand is also called as foundry sand or molding sand. This is utilized for sand Metal Casting . When this sand is oiled or moistened, it has a tendency to pack well and retain the shape. Green Sand is made up of three things: Pulverized Coal, Water, and Bentonite Clay and Sand. Out of these four components, the biggest part is that of the sand. There are several proportions of these four components. The different ratios are used to adjust the surface finish, moldability and capacity of the hot molten metal to degas. The prime use of this sand is in the Casting . The coal is usually called as sea coal in foundries. The Amount of Sea Coal is just about less than five percent. It undergoes partial combustion when there is molten metal present and this causes offgassing of organic vapors.
Green sand is stored in flasks (as the casters call the container). Boxes without the bottoms or lids are these types of boxes. This box is divided into two half parts and these are connected together. These halves are called as the top or cope and bottom or drag flask.
As per its name, green sand is not green in color. The word “green” is used as it is used in the wet state.
