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Technical Product Specifications
Precision and Quality Specified
itp uses only the highest precision, highest quality spheres available in the range of Grade 3 to Grade 5
| Ruby spheres | Ceramic spheres | Silicon nitride spheres | Zirconia oxide spheres | |
|---|---|---|---|---|
| Material | Synthetic ruby monocrystal Al₂O₃ |
Aluminum oxide polycrystal >99.9 Al₂O₃ |
Silicon nitride polycrystal Si₃N₄ |
Zirconia oxide ZrO₂ polycrystal |
| Form deviation¹ | 0.08 µm - 0.13 µm | 0.08 µm - 0.13 µm | 0.08 µm - 0.13 µm | 0.08 µm - 0.13 µm |
| Diameter deviation | 0.08 µm - 0.13 µm | 0.08 µm - 0.13 µm | 0.08 µm - 0.13 µm | 0.08 µm - 0.13 µm |
| Roughness Ra | 0.007 µm - 0.008 µm | 0.007 µm - 0.008 µm | 0.004 µm - 0.005 µm | 0.007 µm - 0.008 µm |
| Hardness | 2400 Vickers | 2100 Vickers | 1600 Vickers | 1200 Vickers |
| Density | 3.99 g/cm³ | 3.85 g/cm³ | 3.20 g/cm³ | 6.05 g/cm³ |
| Thermal expansion | 5.4 × 10-6 K-1 | 8.8 × 10-6 K-1 | 2.9 × 10-6 K-1 | 10.5 × 10-6 K-1 |
| Compression strength (MPa) | 2100 | 3800 | 3000 | 2000 |
| Bending strength (MPa) | 400 | 470 | >1000 | 700 - 1100 |
| Fracture toughness (MN/m³⁄²) | 1 | 4 | >6.5 | 10 |
* As per DIN 5401 ISO 3290 & AFBMA 3290, Sphere Standards
¹ From AFBNA Grade 3 to Grade 5
| Material | Hardness | Density | |
|---|---|---|---|
| Titanium | 3.7035 Grade 2 | 150 Brinell | 4.5 g/cm³ |
| Stainless Steel | 1.4305 | 300 Vickers | 7.95 g/cm³ |
| Tungsten Carbide | DK 120 | 1700 Vickers | 15.0 g/cm³ |
| Ceramic | Alsint 99.7 | 9 Mohs | 3.85 g/cm³ |
| Carbon Fiber | Bending strength > 450 GPa | CTE (Coefficient of Thermal Expansion) -0.4 × 10-6 1/K | ||
