The main chemical element of chromite sand AFS45-55 is chromium oxide. For the iron & steel castings, the Cr2O2 should be at least 46% and SiO2 content less than 1%.  It has high specific gravity and is one of the best high-temperature resistant materials in natural minerals. It has strong thermal conductivity and can be used in various casting processes. Meanwhile, it can eliminate the casting of sand-stick defects substantially.

Chromite sand AFS45-55 is a superior molding sand for water glass casting. The water glass process is usually suitable for the production of precision steel castings. Traditional water glass casting mainly uses silica sand as molding sand and surface sand. However, it can easily cause volume expansion or contraction of castings. It greatly affects the dimensional accuracy of castings. Replacing silica sand with Chromite sand can reduce the defect rate caused by size errors. AFS45-55 is a mostly used specification.

The turbidity of chromium ore sand is an important indicator for determining its cleanliness, mud content, and dust. It directly affects the performance of various indicators of chromium ore sand during the casting process.

Chromite foundry sand is a natural sand that consists of minimum 46% chromium oxide from chrome ore. It has the following features:

Chromite ore is a mineral formed by the condensed crystallization of chromite slurry. It generally presents a massive or granular aggregate. Chromite with low Cr2O3 content (30-45%) is suitable in the metallurgical industry to produce ferrochrome alloy and metal chromium. 46% Cr2O3 and above chromite ore can work as molding sand material in the foundry industry. Crushed and sieved Chromite sand with the fineness of AFS30-35, AFS35-40, AFS40-45, AFS45-50, and AFS45-55 are specifications of molding sand. Chromium ore sand has excellent thermodynamic properties such as high refractory temperature, low specific heat, and high thermal conductivity.

Low turbidity chrome sand for foundry works well for thick-wall castings. The casting wrinkle and heavy leather defects of large thick-walled castings have always been a problem that plagued foundry enterprises. Even the use of chromite sand with superior performance is prone to defects that are difficult to clean. However, through a series of material and technical control methods, the quality of large thick-walled castings can be effectively improved.