87% Al2O3 Calcined Bauxite Powder

87% Al₂O₃ Calcined Bauxite Powder

Premium 200 mesh calcined bauxite powder with 87% Al₂O₃ for demanding refractory, ceramic, and precision casting applications.

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★ High Purity 87% Al₂O₃

★ Fine 200 Mesh Powder

★ Low Impurities

★ Excellent Refractoriness 1770℃+

ISO 9001:2015 Certified · Exported to 40+ Countries

           Download Technical Data Sheet

What Is 87% Al₂O₃ Calcined Bauxite Powder?

▸ 87% Al₂O₃ calcined bauxite powder is a premium refractory material produced by calcining selected high-grade raw bauxite at over 1600°C in a rotary kiln, followed by fine grinding to 200 mesh. With an alumina content of 87%, it delivers outstanding refractoriness, high density, and low impurity levels. It is widely used as a high-performance aggregate and filler in refractory castables, precision investment casting shell systems, ceramic bodies, and specialty kiln furniture where both thermal stability and mechanical strength are critical.

Production Process

▸ From bauxite ore to finished sand, every stage is controlled to ensure consistent quality:

Why Rotary Kiln Calcination Matters for 87% Al₂O₃ Powder

▸ The rotary kiln process ensures the superior properties needed for high-alumina, 200 mesh powder:

▸ High Alumina Content — 87% Al₂O₃ provides excellent refractoriness and resistance to chemical attack in severe environments.

▸ Uniform Calcination — every particle is fully sintered, resulting in dense, low-porosity grains that resist thermal shock.

▸ Consistent 200 Mesh Sizing — precise milling and screening guarantee tight particle size distribution for reliable slurry rheology and packing density.

▸ Low Variability — batch-to-batch consistency that shaft kiln products cannot match, critical for industrial refractory formulations.

Quality Control & Laboratory Testing

▸ XRF Chemical Analysis — every batch tested for Al₂O₃, Fe₂O₃, TiO₂, CaO, MgO, K₂O, Na₂O content

▸ Bulk Density Measurement — pycnometer method to verify ≥ 3.10 g/cm³

▸ Particle Size Distribution — laser diffraction to confirm 200 mesh specification

▸ Magnetic Separation Inspection — removal of iron contamination

▸ Batch Traceability — full documentation from raw ore source to shipping container

Key Benefits

▸ Premium Alumina Content — 87% Al₂O₃ ensures exceptional refractory performance and chemical inertness.

▸ Fine 200 Mesh — ideal particle size for smooth slurries, dense packing, and uniform mold coatings.

▸ Excellent Refractoriness — withstands service temperatures up to 1770°C without deformation.

▸ Low Impurity Levels — minimal iron and alkali content ensures clean reactions in sensitive casting and ceramic processes.

▸ Consistent Quality — tight batch control guarantees repeatable performance in your formulations.

Typical Applications

▸ High-performance refractory castables and gunning mixes
   ▸ Precision investment casting slurries and mold coatings
   ▸ Kiln furniture and ceramic shapes
   ▸ Specialty high-temperature ceramic formulations

Chemical Composition & Physical Properties

Available Grades

Why Choose SEPPE 87% Al₂O₃ Calcined Bauxite Powder?

▸ SEPPE controls the entire production chain — from high-grade bauxite ore selection to fully integrated rotary calcination, fine grinding, and global logistics. Our advanced laboratory monitors every batch for alumina content, particle size distribution, and impurity levels, ensuring that 87% Al₂O₃ powder performs reliably in your most demanding applications.

▸ With customers in over 40 countries and dedicated technical support, SEPPE helps refractory and casting manufacturers achieve superior results, reduce defects, and maintain stable production. Flexible packaging, private labeling, and OEM services are available.

Packaging & Delivery

▸ 25 kg bags, 50 kg bags, 1 MT jumbo bags

▸ 20' FCL: approx 25-27 MT

▸ Private labeling and custom packaging available

FAQ

❓ What is 87% Al₂O₃ calcined bauxite powder used for?

▸ It is used in premium refractory castables, investment casting shell systems, ceramic bodies, and kiln furniture where high alumina content and low impurities are essential.

❓ Is 200 mesh fine enough for investment casting slurries?

▸ Yes. 200 mesh provides an excellent balance of suspension stability, coating smoothness, and packing density for both primary and backup slurry layers.

❓ What makes 87% alumina different from standard 85%?

▸ The higher alumina content delivers improved refractoriness, lower porosity, and greater chemical resistance, making it suitable for more demanding high-temperature applications.

❓ Do you provide samples and technical documents?

▸ Yes. Free samples for lab evaluation, along with TDS, SDS, and SGS test reports are available upon request.