Brown Fused Alumina - Duralum Properties and Applications

Washington Mills manufactures fused aluminum oxide (Al2O3), otherwise known as fused alumina, through an electric arc furnace process. Our brown fused alumina is made into many shapes and grit sizes ranging from macrogrits to microgrits and powders. Aluminum oxide is a tough, hard material (Mohs hardness 9) with high strength, excellent wear and corrosion resistance and good thermal conductivity. Fused alumina is widely used as a raw material in refractories, ceramics shapes, grinding wheels, sandpaper, blasting media, metal preparation, laminates, coatings, lapping, polishing, grinding and hundreds of other applications. Washington Mills’ brown fused alumina grains and powders are available in standard grit and powder sizes and they can also be made to individual specifications.

Description of DURALUM®

DURALUM® is a tough, medium density, virgin, fused brown aluminum oxide (alumina) abrasive for use in products and applications where a tough, strong, aluminum oxide is required.

Applications of DURALUM®

DURALUM® is the most versatile and widely used, medium density fused aluminum oxide available. It is produced in a complete range of grit sizes for grinding wheel manufacturing, coated abrasive products, grit blasting and other general abrasive applications. DURALUM®  is also available with a ceramic iron oxide coating (DURALUM® REDKOTE) or a silane surface treatment (DURALUM® SILKOTE).

Typical Chemical Analysis of DURALUM®

Typical chemical analysis of DURALUM® is given in the table below.

Chemical Composition
Al2O3 (by difference) 96.12%
TiO2 2.70%
SiO2 0.67%
Fe2O3 0.11%
Other Oxides 0.40%

Grain Sizes Available

DURALUM® can be supplied in the following grit sizes:

8, 10, 12, 14, 16, 20, 24, 30, 36, 46, 54, 60, 70, 80, 90, 100, 120, 150, 180, and 220

Powder Sizes Available

DURALUM® powders are available in the following sizes:

240, 280, 320, 400, 500, 600, 800, 1000, 1200, F, FF, FFF
Specialty sizes available upon request

Typical Physical Properties of DURALUM®

Typical physical properties of DURALUM® are described in the following table.

Physical Property Specification
Crystallography Alpha alumina, in the hexagonal crystal system
Color Brown
Specific Gravity 3.92
Knoop100 Hardness 2090
Shape Blocky, with sharp edges
Grading (Grain) ANSI B74.12-2001, Table 2 OR FEPA 42-1:2006
Grading (Powder) ANSI B74.10-2001 OR FEPA 42-2:2006
Magnetics ANSI B74.19-2002 (R2007)
Bulk Density (Grain) ANSI B74.4-1992 (R2007)

This information has been sourced, reviewed and adapted from materials provided by Washington Mills.

For more information on this source, please visit Washington Mills.


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