Brown Fused Alumina for Investment Casting
High-purity alumina media for ceramic shell building in precision casting applications.
Why Use BFA in Investment Casting?
Investment casting, also known as precision casting or lost-wax casting, demands extremely clean, high-performance shell building materials. Brown fused alumina (BFA) is used in stucco and flour stages of shell mold formation due to its thermal shock resistance, chemical stability, and angular morphology that promotes good slurry bonding.
- Excellent shell strength and dimensional precision
- Low thermal expansion and high refractoriness
- Minimizes inclusion and surface defects in castings
Common Applications
- Shell building in aerospace and turbine blade casting
- Medical implant molds (orthopedic/biocompatible alloys)
- Precision parts for pumps, valves, and instrumentation
Compatible with primary and backup coat stages in multilayer shell systems.
Recommended Grain Sizes
- Stucco coating: 16–30 mesh, 36–54 mesh
- Flour application: F90–F180 micro-powder
- Backup layers: 30–60 mesh aggregates
Grains are available in both angular and semi-rounded profiles for different binder systems.
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