Alumina Polishing Powder – High-Purity Grades for Metal, Glass & Ceramic Finishing

Date: November-21-2025 Categories: News、Alumina Views: 28

Alumina polishing powder is one of the most reliable fine abrasives for precision surface finishing. It provides stable cutting action, controlled particle size and high purity. BanlanChem supplies high-purity alumina polishing grades with consistent PSD for customers in metal finishing, optics, ceramics and semiconductor processing. As a professional Manufacturer, Supplier and Factory, we offer global Wholesale supply, OEM packaging and fast delivery.

Before selecting a specific polishing grade, many engineers prefer to compare different alumina types—α-phase, calcined alumina, tabular alumina and fused alumina. If you need a structured comparison, you can find a clear explanation in our material overview here: Types of Alumina – Grades & Applications.

Table of Contents

What Is Alumina Polishing Powder?

Alumina polishing powder is refined α-Al2O3 with controlled particle size distribution. It provides reliable hardness, excellent whiteness, stable chemistry and predictable cutting performance.

high purity alumina polishing powder for metal and glass finishing

If this is your first time working with alumina products, and you want a simple explanation of how calcined alumina is produced and used, here is a clear introduction: What Is Calcined Alumina Powder?

Why Alumina Is Used for Polishing

  • High hardness (≈9 Mohs): Reliable cutting action.
  • Chemical stability: Safe for metals and optical substrates.
  • Consistent PSD: Smooth, uniform finishes.
  • High purity: No staining or contamination.
  • Wide application range: Metals, glass, ceramics and semiconductor surfaces.
alumina polishing particle shape and controlled PSD

Polishing Grades & Particle Sizes

Common polishing alumina grades include:

  • Microfine: 0.2–0.5 μm – optical & semiconductor finishing
  • Fine: 0.5–1.0 μm – metal and ceramic finishing
  • Medium: 1–3 μm – general polishing and pre-polishing
alumina polishing grades and particle size distribution

Applications of Alumina Polishing Powder

1. Metal Finishing

Used for stainless steel, brass, copper, titanium, aluminum and jewelry finishing. Produces uniform gloss and minimal residue.

2. Optical Glass Polishing

Due to its purity and controlled PSD, alumina delivers smooth polishing results without haze. Used for camera lenses, prisms, smartphone glass and optical components.

3. Ceramics Polishing

Ideal for alumina ceramics, zirconia ceramics, dielectric ceramics and cutting tools.

4. Semiconductor Polishing

Microfine grades help remove micro scratches on wafers and substrates.

If you work specifically with calcined alumina in polishing processes, we prepared a deeper technical guide here: Calcined Alumina Polishing Guide.

Polishing Process Guide

Key factors affecting polishing performance include:

  • Abrasive concentration
  • Pressure & speed
  • Polishing pad compatibility
  • pH adjustment and additives
  • Water flow & cooling

Alumina Polishing vs Other Abrasives

Compared with cerium oxide, diamond powder and silicon carbide:

  • Alumina: Best balance of cost, durability and cleanliness.
  • Cerium oxide: Faster for special glass, but costly.
  • Diamond: Ideal for hard ceramics, but expensive.

How to Choose the Right Alumina Polishing Grade

  • Optics → 0.2–0.5 μm
  • Metal finishing → 0.4–0.8 μm
  • Ceramics → 0.5–1.2 μm
  • Semiconductor finishing → microfine high-purity grade

For customers working with resin systems or halogen-free flame-retardant materials, many combine polishing alumina with ATH fillers. Our high-whiteness ATH is commonly selected for its purity and low impurity content: High-Whiteness Aluminum Hydroxide (ATH).

Typical Specifications

1. Suitable for vibratory polishing (machine polishing, tumbling), manual polishing (abrasive polishing) and so on of artificial stones, zircon, glass, natural stones, bowlder, jade, agate, etc.
2. Widely used in the grinding and polishing of aluminum, copper, stainless steel, stone, glass, tile, etc.
3. Can also be used in surface finish of burnishing stick, polishing slurry, paint surface, acrylic, stainless steel mirror, non-ferrous metal, jade, marble, granite rock, crystal, and optical glass.
4. Used in the manufacturing of artificial abrasive materials and artificial abrasives.

Crystal phaseAl2O3SiO2Fe2O3Na2O+K2O
r>99.8<0.02<0.03<0.04
a>99.8<0.02<0.03<0.05

Packaging & OEM Options

  • 25 kg paper bags with PE liner
  • 500–1000 kg FIBCs
  • OEM labels, barcodes, pallets
  • Stable bulk supply for global distributors

FAQ

What is alumina polishing powder used for?

Metal finishing, optical glass polishing, ceramic surface treatment and semiconductor wafer finishing.

Do you offer OEM packaging?

Yes. OEM/ODM options are available for distributors and wholesalers.

Do you offer microfine grades?

Yes—down to D50 0.2–0.3 μm.

If you want to understand the broader material family behind alumina polishing, this article gives a clear summary: Types of Alumina.

For polishing with calcined alumina: Calcined Alumina Polishing Guide.

For beginners: What Is Calcined Alumina Powder?.

Contact the Manufacturer

Looking for a reliable Alumina Polishing Powder Manufacturer & Wholesale Supplier? BanlanChem offers stable grades, consistent PSD, samples, OEM labeling and fast global shipping. Contact us for pricing and technical recommendations.

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