25% Alumina Zirconia – Superior Hardness & Precision Abrasive
GNPGraystar’s Alumina Zirconia 25% is a hard, very tough, sharp abrasive. It is produced by fusing zircon sand and alumina at about 1900°C.
Properties
General
| Property | Value | Comment |
|---|---|---|
Bulk density | 2.11 - 2.54 g/cm³ | ANSI B74.4 |
Crystal size | 17.0 μm | |
Density | 1.98 - 2.38 g/cm³ | loose pack density |
True particle density | 4.6 g/cm³ |
Mechanical
| Property | Value | Comment |
|---|---|---|
Hardness, Knoop, HK2 | 1600 [-] | Knoop (100) |
Hardness, Mohs | 9.0 [-] |
Thermal
| Property | Value |
|---|---|
Melting point | 1900.0 °C |
Chemical properties
| Property | Value | Testing Standard | Comment |
|---|---|---|---|
Aluminium | 75 % | ANSI B74.14 | max. Al₂O₃ |
Calcium | 0.1 % | ANSI B74.14 | CaO |
Iron | 0.3 % | ANSI B74.14 | Fe₂O₃ |
Magnesium | 0.03 % | ANSI B74.14 | MgO |
Silicon | 0.3 % | ANSI B74.14 | SiO₂ |
Sodium | 0.08 % | ANSI B74.14 | Na₂O |
Sulfur | 0.06 % | ANSI B74.14 | |
Titanium | 0.4 % | ANSI B74.14 | TiO₂ |
Zirconium | 23 % | ANSI B74.14 | ZrO₂ |
Technological properties
| Property | ||
|---|---|---|
| Application areas | GNPGraystar’s Alumina Zirconia 25% 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, as well as in some refractory applications. | |
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