White Ceramic Alumina Grinding Balls: Ultra-Hard Milling Media
Known as the "White Diamonds of Milling," our ultra-hard alumina grinding media delivers exceptional performance in precision milling applications across multiple industries.
Product Overview
Alumina grinding media consists of spherical balls made from high-purity alumina ceramic (Al₂O₃). With a density of 3.6 g/cm³ and hardness exceeding 80 HRA, these grinding balls offer superior durability and efficiency for material processing.
Key Advantages
- High Hardness: Mohs hardness of 9 ensures effective milling without excessive wear
- Abrasion Resistance: Exceptional durability for long-term use with minimal degradation
- Chemical Inertness: Resists pH 1-14, making it safe for acids/alkalis and pharmaceuticals
- Purity: White color signifies high purity for contamination-sensitive applications
Technical Specifications
Chemical Composition
| Composition |
Al₂O₃ |
SiO₂ |
CaO+MgO |
Fe₂O₃ |
| Wt% |
≥92 |
7 max |
≤2 |
<0.1 |
Physical Properties
| Specific Gravity (g/cm³) |
Bulk Density (kg/L) |
Hardness (Moh's) |
Water Absorption (%) |
Self Wearing Loss (24hrs) |
Compression (MPa) |
| ≥3.65 |
≥2.2 |
9 |
<0.01 |
≤0.012 |
≥2000 |
Available Sizes (mm)
| 0.5-1.0 |
6.0 |
20.0 |
70.0 |
| 1.0 |
8.0 |
25.0 |
80.0 |
| 2.0 |
10.0 |
30.0 |
90.0 |
| 3.0 |
13.0 |
40.0 |
100.0 |
| 4.0 |
15.0 |
50.0 |
|
| 5.0 |
18.0 |
60.0 |
|
Performance Comparison
Mechanical & Physical Properties
| Property |
Alumina (92%) |
Alumina (99%) |
Zirconia |
Steel |
Silica Sand |
| Density (g/cm³) |
3.6 |
3.9 |
6.0 |
7.8 |
2.2 |
| Hardness (Mohs/HV) |
9 (~1,500 HV) |
9 (~1,800 HV) |
8.5 |
6-7 |
7 |
| Wear Rate (g/ton) |
10-50 |
5-20 |
1-5 |
100+ |
300+ |
| Compressive Strength |
2,000 MPa |
2,500 MPa |
2,200 MPa |
500 MPa |
Low |
Key Takeaways:
- 99% Alumina offers 30% lower wear than 92% grade
- 2-5x longer lifespan vs. steel in abrasive slurries
- Harder than zirconia but less tough (ideal for fine grinding)
Chemical & Thermal Resistance
| Property |
Alumina (99%) |
Performance Impact |
| Chemical Inertness |
Resists pH 1-14 |
Safe for acids/alkalis, pharmaceuticals |
| Max Temperature |
1,600°C |
Stable in kilns, calcination |
| Thermal Shock |
Moderate |
Avoid rapid quenching (>200°C/min) |
| Contamination Risk |
None |
Zero metal ions (critical for Li-ion batteries) |
Industry Applications
| Industry |
Benefit of Alumina Balls |
| Mining |
50% lower replacement cost vs. steel in ore grinding |
| Pharma |
FDA-compliant, no endotoxin release |
| Batteries |
Prevents Fe/Ni contamination in cathode materials |
| Paints |
Maintains color purity (no metal leaching) |
Product Sets Available
- 1L Alumina Planetary Mill Jar Set: 12×20mm, 239×10mm, 1145×5mm balls
- 500ml Alumina Planetary Mill Jar Set: 14×15mm, 119×10mm, 573×5mm balls
- Small Size Media Set for 1L Jars: 95×10mm, 3728×4mm, 9163×2.5mm balls
Packaging Information
Standard packaging: 25kg woven bags, 1000-1250kg per pallet with shrink wrap.
Handling & Safety Guidelines
- Store in dry, clean environment to prevent contamination
- Avoid sudden thermal shocks (>200°C/min temperature changes)
- Regularly inspect for wear, cracks, or surface damage
- Not recommended for high-impact applications
- Follow all manufacturer guidelines for optimal performance
Quality Assurance
Global Distribution
Our alumina grinding media has been successfully shipped to clients worldwide, including:
Frequently Asked Questions
What are alumina ceramic balls made of?
They are made from aluminium oxide (Al₂O₃), a high-purity ceramic material known for its hardness and wear resistance.
What are the key properties?
High hardness, excellent wear resistance, chemical stability, high-temperature resistance (up to 1600°C), and electrical insulation.
Why choose alumina over steel or other ceramics?
They offer superior wear resistance, chemical stability, and are lighter than steel, making them ideal for specific applications.
Your message must be between 20-3,000 characters!
