Properties:
- Complete crystallization, High purity up to 99.5% Al2O3
- Low apparent porosity Less than 5%
- Good resistance to alkalis and mineral acids
- Low water absorption less than 1%
- High hardness and toughness
- High thermal conductivity
- Excellent thermal shock resistance
- Good abrasion resistance.
- High volume stability
- High anti-bending strength
Technical data:
Typical physical properties | ||||||||
Mohs’ Hardness | 9.0 | |||||||
Knoop hardness | 2000kg/cm3 | |||||||
Thermal conductivity | (100℃)0.069 cal/sec cm℃ | |||||||
Heat capacity | (20℃)0.21cal/gm/(100℃) | |||||||
Melting temperature | 2050℃ | |||||||
Max. service temperature | min 1800℃ | |||||||
Refractive Index | 1.76 | |||||||
Appearance | Ball shape | |||||||
Chemical composition(%) | ||||||||
Index | AL2O3 | SiO2 | Fe2O3 | Na2O | ||||
Guarantee Value | min 99.3 | max 0.18 | max 0.1 | max 0.4 | ||||
Typical Value | 99.5 | 0.04 | 0.02 | 0.29 | ||||
Key Physical Index | ||||||||
Index | Bulk Specific Gravity (g/cm3) | Apparent Porosity(%) | Water absorption rate(%) | |||||
Guarantee Value | min 3.5 | max 5.0 | max 1.5 | |||||
Typical Value | 3.65 | 2.35 | 0.72 |
Applications:
1. Heat storage ball
2. Thermal chemical agent
3. Military industry
4. Lapping ball
Available Sizes:
15-23mm,20-28mm,with tolerance±5mm
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