Alumina Suspension

Formulated for the same final polishing step as these brand products:

•
Buehler — MicroPolish / MicroPolish II

•
Struers — alumina suspension

•
Allied High Tech — alumina suspension

Runs on Buehler, Struers, LECO, Allied, and PACE systems with no change to your process. It is a comparable product for the same step — not a branded or drop-in item.

Same grading and micron sizing, typically 20–40% less.

Request a free sample and test it on your own bench.

Alumina Suspension

What This Product Is

Alumina suspension is a water-based suspension of deagglomerated aluminum oxide (Al₂O₃) particles used for intermediate and final polishing in metallographic preparation. Unlike colloidal silica, which polishes chemo-mechanically, alumina is a purely mechanical abrasive: the hard oxide particles cut the surface directly, making it a predictable, general-purpose oxide polish.

It is supplied in graded particle sizes — commonly 1.0 µm and 0.3 µm alpha alumina for polishing, and 0.05 µm gamma alumina for the finest final step. Deagglomeration keeps the particles dispersed so they polish cleanly rather than dragging as clumps.

Intended Use in Metallography

Alumina suspension is used for the final and near-final polishing steps , after diamond polishing. It is commonly selected when:

• A durable, purely mechanical oxide polish is wanted rather than a chemo-mechanical one

• Good edge retention is important