Performance of Casting Sand

As the core material in casting technology, the performance of casting sand directly affects the quality of castings and the stability of the production process. From the perspective of official language, the main properties of casting sand are explained as follows.

1、 Chemical Properties of Casting Sand  

1. Purity and Cleanliness

Casting sand needs to have high purity and cleanliness to reduce the impact of impurities on the quality of castings. Taking silicon sand as an example, the sand used for cast iron requires a SiO ₂ content of over 90%, while large cast steel parts have higher requirements for SiO ₂ content, usually reaching over 97%. In addition, the content of impurities such as soil and organic matter in casting sand should be strictly controlled within a certain range.

2、 Physical Properties of Casting Sand   

1. Particle size and distribution

The particle size distribution of casting sand should be uniform to ensure good filling performance and breathability. The particle size range is usually selected based on the size and shape of the casting, typically ranging from 0.1mm to 3.0mm. By using screening analysis and other methods, the particle size distribution of casting sand can be accurately determined to meet the needs of different casting processes.

2. Particle shape

The particle shape of casting sand has a significant impact on the quality of castings. The ideal particle shape should be spherical or nearly spherical, with a smooth surface and no protruding edges. This particle shape helps improve the flowability and compactness of sand molds, while reducing friction between sand particles and improving the surface smoothness of castings.

3. Loose density and flowability of casting sand

Loose density reflects the density state of casting sand  before vibration treatment, while flowability refers to the ability of casting sand to flow freely in the mold. High quality casting sand should have moderate loose density and good flowability to ensure that the sand mold can accurately and quickly fill the mold, reducing casting defects.

4. Fire resistance and thermal stability ofcasting sand

Fire resistance refers to the stability of casting sand under high temperature conditions, while thermal stability refers to its ability to maintain stable performance during temperature changes. Casting sand needs to have sufficient fire resistance and thermal stability to withstand the high temperature during the casting process, prevent sand melting or deformation, and ensure the dimensional accuracy and surface quality of castings.

3、 Other Properties of Casting Sand  

1. Breathability

Breathability refers to the ability of gas to pass through the casting sand layer. Good breathability helps to eliminate gases and moisture in the mold, preventing defects such as porosity and shrinkage inside the casting. Breathability testing is one of the important indicators for evaluating the performance of casting sand.

2. Fragmentation

Collapsibility refers to the ability of casting sand to be easily removed from the casting after cooling and solidification. High quality casting sand should have good collapsibility for subsequent cleaning and processing work.

In summary, the performance of casting sand is a key indicator for evaluating its quality. In practical applications, suitable casting sand should be selected according to specific casting processes and casting requirements, and strict performance testing and quality control should be carried out to ensure the quality of castings and the stability of the production process.

As a largest leader and manufacturer of sintered ceramic sand for foundry in China, our business scope is very broad . We have casting sand, spherical sand , ceramic foundry sand, sanding 3d prints , lost foam sand casting, golden sand, resin coated sand, sintered sand , bauxite sand , sintering sand , ceramsite foundry sand and supersand . The casting sand price in our company are reasonable . If you are interesting in our product welcome to contact us!