Alumina protective sleeve
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Quality/Safety Certification: 0.00
Alumina protective sleeve
1.Material: 85 - 99.5% alumina ceramic
2.Purpose:used in various furnace
3.Max length:2.5M
Alumina protective sleeve
Gongtao company specilize in producing various alumina ceramic tubes with different shapes.These tubes can be used as furnace tubes,thermocouple tubes or insulating tubes.We have many stocks in our warehouse.And we can
also accept customised items.
Please see the blew information:
| Material | 85 Al2o3 | 90 Al2o3 | 95 Al2o3 | 99 Al2o3 |
| Al2o3 | 85% | 90% | 93% | 99.30% |
| Fe2o3 | ≤ 1.0 | ≤ 0.5 | ≤ 0.5 | ≤ 0.3 |
| Desnsity: g / cm3 | 3.4 | 3.5 | 3.6 | 3.85 |
| Vickers Hardness | ≥ 8.6 | ≥ 8.8 | 9 | 9 |
| Water Absorption:% | ≤ 0.2 | ≤ 0.1 | ≤ 0.085 | ≤ 0.01 |
| Refractoriness:°C | 1580 °C | 1600 °C | 1650 °C | 1800°C |
| Flexural Strength:Mpa | 180 | 200 | 240 | 280 |
| Wear Rate( at room temperature, erosion, 100 grinding)% | ≤ 3 | ≤ 2.5 | ≤ 1 | ≤ 0.5 |
| Dimension | Outer dia. mm | Inner dia.mm | Length mm | Remark | |
| Item | |||||
| Thermocouple protection tube | 7-120 | 1-110 | 10-2000 | If you need others,we can customize for you. | |
| Insulated tube | Single hole | 2-120 | 1-110 | 10-2000 | |
| (inner core) | Double holes | 1-10 | 0.4-2 | 10-2000 | |
| Four holes | 2-10 | 0.5-2 | 10-2000 | ||
| Index for 99% corundum ceramic tube: | |
| Twisting strength | 3160 kg/cm2 |
| Tensile strength | 23300 kg/ cm2 |
| Bending stength | 2520 kg/ cm2 |
| Hardness | 9 |
| Vol.density | >3.8 g/ cm3 |
| Coefficient of linear expansion | (room temperature-800°C) 7.75*10-6 /°C |
| Thermal stability | 1300°C-room temperature no rupture for three times(above 50) |
| 1000°C-room temperature no rupture for three times(abov 50) | |
| Puncture voltage | (room temperature)>10KV/mm |
| Vol.resistance | (room temperature)>>1014 Ω. Cm |
| Longtime applying temperature | 1600°C |
| Short time applying temperature | 1800°C |
| AL2O3 | ≥99% |
| Refractoriness | 2030°C |
