Fused Silica AB Grade – Technical Data for Investment Casting
In investment casting, the quality of the primary shell layer directly determines the surface finish and dimensional accuracy of the final casting. Fused Silica AB Grade is specially engineered for this critical application, offering high purity, controlled particle size distribution, and excellent chemical stability.
Why Choose Fused Silica AB Grade?
AB Grade fused silica is widely preferred for primary shell layers, where smooth surface quality, low reactivity, and consistent performance are essential. Its low impurity content minimizes the risk of metal contamination, while its optimized particle size distribution ensures uniform coating and strong shell integrity.
Key advantages include:
- Excellent surface finish for precision castings
- High dimensional stability during firing and pouring
- Low alkali and iron content for reduced chemical interaction
- Reliable performance in demanding investment casting processes
Technical Specifications
Purity
- SiO₂ (Grains): ≥ 99.85%
- SiO₂ (Powders): ≥ 99.7%
High silica purity ensures superior thermal stability and low expansion behavior, which are critical for crack-free shell formation.
Chemical Composition (Typical)
The extremely low alkali and iron levels help maintain shell strength and prevent reactions with molten alloys.
Particle Size Distribution (PSD)
Grains
- Size range: 0.2 – 0.5 mm
- 0.5 – 0.212 mm: ≥ 80%
Powder (325F)
- +0.045 mm: ≤ 5%
The carefully controlled PSD ensures excellent slurry rheology, smooth coating, and consistent shell thickness.
Application in Investment Casting
AB Grade fused silica is primarily used for:
- Primary shell layers
- Precision investment castings
- Components requiring high surface quality and tight dimensional tolerances
Typical applications include aerospace components, industrial parts, and high-precision metal castings where surface integrity is critical.
Conclusion
Fused Silica AB Grade is a proven solution for investment casting foundries seeking reliable primary shell materials. With high SiO₂ purity, low impurity levels, and optimized particle size distribution, it delivers consistent performance, excellent surface finish, and dimensional precision in demanding casting environments.
If you are looking for a stable and high-quality fused silica material for primary shell applications, AB Grade is an ideal choice.