Final Polishing Suspensions and Powders


Final Polishing Suspensions and Powders

Final Polishing

Buehler’s premium final polishing suspensions and powders are formulated to deliver superior finish to your samples.

Final polishing products are designed to remove the final layer of surface deformation and prepare your sample for analysis. Deformities may not be visible to the naked eye, but must be removed for some specimen analysis techniques.

Application Specific Solutions

The material type dictates which final polishing powder or suspension is ideal. Choose from Buehler’s large portfolio of alumina and silica products that meet your fine polishing needs.

Final Polishing Suspensions

Buehler oxide suspensions are intended to be applied directly to polishing cloths with no mixing. No additions of extenders are required.

MasterPrep® Alumina


MasterPrep Alumina is a finely dispersed aluminum oxide of 0.05µm nominal abrasive size in a basic (pH ~ 10.5) suspension. It contains seeded gel alumina, and it’s particle size distribution is more tightly controlled than any other type of alumina suspension available in the market.

MasterPrep is capable of producing optically scratch-free surface finish on ferrous metals, copper alloys, low-melting point alloys, polymers and minerals.

Pair MasterPrep with soft, napped cloth such as MicroCloth® polishing cloth for the best performance.

MasterMet® Colloidal Silica

MasterMet Colloidal Silica Suspension

Colloidal silica of 0.06µm nominal abrasive size in a basic (pH ~ 10.5) suspension, MasterMet provides a combination of mechanical and chemical polishing.

This type of suspension is essential for fine polishing materials that form stable, passive films. These materials include aluminum alloys, refractory metals, silicon and ceramic.

Pair MasterMet is ChemoMet® for the best performance except when manually polishing in which case MicroCloth® is most suitable.

MasterMet® 2 Colloidal Silica

MasterMet 2

A non-crystallizing, basic (pH ~ 11) silica suspension of nominal 0.06µm abrasive size, MasterMet 2 is applied for the same material types as MasterMet. MasterMet 2 is ideal anytime crystallization of silica due to extended air exposure is a concern.

Similar to MasterMet, pair MasterMet 2 with ChemoMet® for the best performance except when manually polishing in which case MicroCloth® is most suitable.

MasterPolish® Final Polish


A blend of high purity alumina and colloidal silica (0.050µm, pH ~ 9), MasterMet Polish contains minimal water and is ideal for water sensitive materials.

MicroPolish® Alumina Suspension

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Agglomerated alumina suspensions of 0.05µm, 0.3µm and 1µm sizes offer high removal rates and suitable for use on pure and alloyed lead and magnesium.

MiroMet® Polish

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MiroMet is a 1µm cerium oxide water based suspension. It is generally used for glass, but it also suitable for soft materials with very low melting points.

Final Polishing Powders

Buehler’s alumina powders offer high removal rates on various materials and excellent surface finish for your sample.

MicroPolish® Alumina Powder

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MicroPolish agglomerated alumina powders of 0.05µm, 0.3µm and 1µm sizes deliver high removal rates and ideal for use on pure and alloyed lead and magnesium.

MicroPolish® II Alumina Powder

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MicroPolish II deagglomerated alumina powders of 1µm size delivers high removal rates on most minerals and metals.

Related Consumables
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Frequently Asked Questions
Why is Final Polishing important?

A high quality polish will make the specimen surface smooth and shiny through mechanical and/or chemo-mechanical abrasion, while retaining the true microstructure and flatness.

MasterPrep Alumina contains seeded gel alumina, which provides efficient material removal combined with superior surface finish via a purely mechanical, abrasive process. MasterMet 2, on the other hand, contains colloidal silica, which has a soft reaction layer to chemically attack the specimen surface. The spherical shape of the colloidal silica enables it to wipe away the top surface layer without scratches.

Dr. Mike Keeble

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