Aluminum Oxide Powder for Metallographic Polishing

Aluminum Oxide (Alumina) Powder – High-Purity, Tightly Graded for Metallographic Sample Preparation

OnPoint Abrasives’ Aluminum Oxide (Alumina) Powder is engineered specifically for metallographic grinding and polishing, delivering the consistency, purity, and performance required in high level materials analysis laboratories. Our powders are precision-graded for tight particle size distribution, ensuring predictable, repeatable performance across a wide range of materials.

These alumina powders deliver high material removal rates on soft metals such as lead and magnesium, while producing flat, scratch-free surfaces ideal for optical, SEM, and microhardness testing. Available in 0.30µm (99.91%), 1µm (99.9%), 3µm (99.57%), and 5µm (99.69%), each grade supports a consistent, high-quality polishing workflow.

Key Features

• High-purity aluminum oxide designed specifically for metallography
• Tightly graded particle sizes for uniform and repeatable results
• High removal rates on soft metals such as lead and magnesium
• Excellent stability in both aqueous and glycol-based suspensions
• Produces flat, scratch-free surfaces suitable for optical and SEM examination
• Consistent lot-to-lot quality ensures reliable QA/QC workflows

Applications

• Intermediate and final metallographic polishing (manual or automated)
• Formulation of alumina suspensions and slurries
• Surface preparation for optical microscopy, SEM, and hardness testing
• Polishing of steels, cast irons, superalloys, carbides, ceramics, and coatings
• High-removal polishing of soft alloys (lead, magnesium, etc.)
• Post-diamond finishing steps requiring improved surface finish

Particle Size & Purity

Packaging, Part Numbers & Pricing

1 lb (0.45 kg) Packages

5 lbs (2.27 kg) Packages