Alumina Zirconia (25%) - ZF/ZS Alundum

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Aluminum Zirconia-25% (ZF or ZS Alundum) is a hard, very tough, sharp abrasive. It is produced by fusing zircon sand and alumina at about 1900°C.


Alumina Zirconia is used primarily for producing large grinding wheels for foundry snagging and track grinding. It is also an excellent blasting material for granite and other materials where long life is required.

Typical Chemical Analysis:

Aluminum Oxide (Al2O3)75.0%
Zirconium Oxide (ZrO2)23.0%
Titanium Dioxide (TiO2)0.40%
Silicon Dioxide (SiO2)0.30%
Iron Oxide (Fe2O3)0.30%
Sodium Oxide (Na2O)0.08%
Calcium Oxide (CaO)0.10%
Magnesium Oxide (MgO)0.03%
Sulfur (S)0.06%

Physical Characteristics:

Crystal Size:17 Microns
True Density:4.60 g/cm3
Hardness:Knoop 1600, Mohs 9.0
Melting Point:1900°C
Loose Pack Density:1.985 – 2.380 g/cm3
Bulk Density Range:132 – 159 lbs/ft3

ANSI Test Methods:

Bulk Density:B74.4

Packaging & Shipping:

Warehousing in Bluffton, SC and Niagara Falls, NY
400 lb. fiber drums (grade sizes 8 – 120)
2000 lb. supersacks
Plastic pails, etc. for a surcharge (SC only)

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