200Mesh
SEPPE BAUXITE
25083000
Fine 325 mesh calcined bauxite powder for precision investment casting shell systems.
▸ Bauxite powder for casting is a finely ground refractory material produced by calcining high-grade raw bauxite and milling it to a controlled 325 mesh particle size. With high alumina content and low impurity levels, this powder is specially designed for use in investment casting slurries, mold coatings, and refractory filler applications where fine particle size and consistent chemistry are critical for achieving smooth surface finishes on cast parts.
▸ From bauxite ore to finished sand, every stage is controlled to ensure consistent quality:
01 — Raw Material & Supply · Own mines, Al₂O₃ ≥ 65%
02 — Calcination Process · Rotary kiln at 1450–1550°C
03 — Processing & Grading · Crushing, screening & magnetic separation
04 — Testing & Delivery · Full lab testing & global packaging
▸ Our fully calcined bauxite powder delivers consistent performance in precision casting applications:
• Fine Uniform Particle Size — 325 mesh ensures excellent suspension in slurries and smooth mold coatings.
• High Refractoriness — withstands pouring temperatures of up to 1770°C without breaking down.
• Low Impurity Content — minimal iron and alkali content prevents unwanted reactions with molten alloys.
• Consistent Chemistry — batch-to-batch uniformity ensures repeatable slurry viscosity and mold performance.
▸ XRF Chemical Analysis — every batch tested for Al₂O₃, Fe₂O₃, TiO₂, CaO, MgO content
▸ Particle Size Analysis — laser diffraction to verify 325 mesh specification
▸ Bulk Density Measurement — pycnometer method to verify specified density range
▸ Magnetic Separation Inspection — removal of iron contamination
▸ Batch Traceability — full documentation from raw ore source to shipping container
▸ 325 Mesh Fine Powder — optimised particle size for smooth slurry rheology and uniform mold coating.
▸ High Refractoriness — maintains integrity at pouring temperatures up to 1770°C.
▸ Chemical Stability — low iron and alkali content minimizes metal-mold reactions.
▸ Excellent Suspension — fine particles remain uniformly dispersed in colloidal silica and ethyl silicate binders.
▸ Consistent Quality — batch-to-batch uniformity ensures repeatable casting results.
▸ Investment casting primary slurry formulations
▸ Mold coating and facing layers
▸ Precision casting of stainless steel and superalloys
▸ Refractory filler for high-temperature applications
| Chemical Composition | |
| Al₂O₃ | 75 - 90% |
| TiO₂ | 2 - 3% |
| SiO₂ | 6 - 18% |
| Fe₂O₃ | 0.5 - 2.5% |
| P₂O₅ | 0 - 0.3% |
| MgO | 0 - 0.2% |
| CaO | 0 - 0.4% |
| K₂O + Na₂O | 0 - 0.4% |
| Physical Properties | |
| Appearance | Fine Grey Powder |
| Target Mesh Size | 325 Mesh |
| Specific Gravity | ≥ 3.70 g/cm³ |
| Bulk Density | 2.80 - 3.25 g/cm³ |
| Hardness | 7.5 - 9.0 Mohs |
| Refractoriness | ≥ 1770℃ |
| LOI | 0.1 - 0.5% |
| Grade | Al₂O₃ Content | Main Application |
| Standard Casting Powder | 80% Min | General purpose investment casting slurries |
| Premium Casting Powder | 85% Min | Precision casting of stainless steel and superalloys |
| High-Purity Casting Powder | 87-88% Min | Aerospace and critical application castings |
▸ SEPPE controls the entire production chain — from high-grade bauxite ore selection to fully integrated calcination, fine grinding, and global logistics. Our advanced laboratory monitors every batch for particle size distribution and chemical consistency, ensuring your casting powder performs reliably in every slurry formulation.
▸ With established supply to over 40 countries and dedicated technical support, SEPPE helps investment casting foundries achieve superior surface finishes, reduce shell cracking, and maintain stable production. Flexible packaging and OEM services are available.
▸ 25 kg bags, 50 kg bags, 1 MT jumbo bags
▸ 20' FCL: approx 25-27 MT
▸ Private labeling and custom packaging available
▸ It is used as a refractory filler in investment casting slurries to create smooth, precise mold shells for stainless steel, superalloys, and other high-temperature castings.
▸ The fine particle size ensures excellent suspension in slurries, smooth coating application, and good packing density in mold layers, resulting in superior surface finishes on cast parts.
▸ Yes. Every batch undergoes laser particle size analysis to verify 325 mesh specification before shipment.
▸ Yes. Free samples for lab evaluation, along with TDS, SDS, and SGS test reports are available upon request.
▸ Contact SEPPE for: • Free Samples • TDS / SDS Documents • OEM Packaging Options • Bulk Container Pricing
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