Physical Properties
| Al2MO3(99.5% Alumina) | |
|---|---|
| Specific Gravity | 3.9 - 3.939 |
| Flexural Strength(N/mm2) | 360 |
| Volume Resistivity(Ω・m) | ＞1012 |
| Thermal Conductivity(W/(m・K)) | 32(20℃) |
| Linear Expansion Coefficient(K-1) | 7.2×10-6(40 - 400℃) |
| Vickers Hardness(GPa) | 15.5 |
| Maximum Duty Temperature(℃)(GPa) | 1500 |
- Values in chart are for reference only. They are not guaranteed values.
Chemical Resistance of Ceramic Screws
| Chemical Name | Temperature | Hour | Effect |
|---|---|---|---|
| 35% Hydrochloric Acid | Boiling | 30 minutes | ◎ |
| 70% Nitric Acid | Boiling | 30 minutes | ◎ |
| 98% Sulfuric Acid | Boiling | 30 minutes | ◎ |
| 90% Phosphoric Acid | Boiling | 30 minutes | 〇 |
| 60% Hydrofluoric Acid | 20℃ | 24 hours | △ |
| 10% Potassium Hydroxide | 80℃ | 7 Days | ◎ |
| Potassium Hydroxide | 500℃(Boiling) | 24 hours | △ |
| Sodium Hydroxide | 500℃(Boiling) | 24 hours | 〇 |
| Sodium Carbonate | 900℃(Boiling) | 24 hours | 〇 |
| Sodium Sulfate | 1000℃(Boiling) | 24 hours | ◎ |
| Potassium Fluoride | 90℃(Boiling) | 4 hours | × |
- ◎：No Corrosion
- 〇：Slight Corrosion
- △：Moderate Corrosion
- ×：Heavy Corrosion
- When tightening ceramic screws, use a torque driver or torque wrench and do not exceed the torsional torque.The recommended torque is 50% of the torsional torque.
| M | Torsional Torque (N・m) |
|---|---|
| M3 | 0.04 |
| M4 | 0.05 |
| M5 | 0.10 |
| M6 | 0.15 |
| M8 | 0.30 |
| M10 | 0.50 |
