Investment Casting Sand | The Refractory

Investment Casting Sand (16/30 30/50 50/80)

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Investment casting sand is a specialized material used in the investment casting process, which is known for producing high-precision and complex metal parts. The sand acts as a refractory material, forming the mold into which molten metal is poured. The different grades of investment casting sand, such as 16/30, 30/50, and 50/80, refer to the particle size distribution and are selected based on the specific requirements of the casting process.

Specifications - 16/30

Particle Size: 0.595 mm - 1.19 mm
Bulk Density: Approximately 80-100 lb/ft³ (1280-1600 kg/m³)
Shape: Typically round or angular, promoting good mold stability and surface finish.
Color: Generally light brown to tan, depending on the silica content.

Specifications - 30/50

Particle Size: 0.297 mm - 0.595 mm
Bulk Density: Approximately 80-100 lb/ft³ (1280-1600 kg/m³)
Shape: Usually round or angular particles, ensuring detailed and smooth mold surfaces.
Color: Generally light brown to tan, depending on the silica content.

Specifications - 50/80

Particle Size: 0.177 mm - 0.297 mm
Bulk Density: Approximately 80-100 lb/ft³ (1280-1600 kg/m³)
Shape: Typically round or angular, providing excellent detail and surface quality in castings.
Color: Generally light brown to tan, depending on the silica content.

Chemical Properties

Silicon Dioxide (SiO2): 99% minimum, providing high refractoriness and thermal stability.
Aluminum Oxide (Al2O3): <0.5%, to maintain purity and thermal resistance.
Iron Oxide (Fe2O3): <0.1%, minimizing impurities that could affect the casting.
Calcium Oxide (CaO): <0.1%, ensuring minimal fluxing effects.
Magnesium Oxide (MgO): <0.1%, ensuring stability and reducing impurity levels.

Applications

Investment Casting
Refractory Coatings
Foundry Industry

Conclusion

Investment casting sand grades 16/30, 30/50, and 50/80 are essential materials in the precision casting industry. Their specific particle size distributions, high purity, and thermal stability make them ideal for creating detailed and accurate molds. Proper handling and storage are critical to maintaining the quality and performance of the sand, ensuring successful casting operations and high-quality final products.