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Gongtao company mainly produce alumina tubes, rods and various industrial ceramic parts, which are mainly used in thermalcouple temperature, liquid steel continous temperature, various industrial furnace(containig vacuum furnace, carburizing furnace, wire furnace, atmosphere furnace etc), especially widely used in petrochemical, spinning, electric, instrumentation, mechanical workout, military project etc industry.
Our items are various and exported to many countries.Welcome to contact us!
They are recommended for use in mass spectrometers and other vacuum systems as feed through lines, thermocouple insulators, and in other applications requiring electrical and thermal insulators. Other types are also available - two hole, four hole insulator tubes, and solid rods.
Single bore ceramic beads:
ID | 0.2 | 0.3 | 1 | 1 | 1 | 1.5 | 1.5 | 1.5 | 2 | 2 | 2 |
OD | 0.6 | 1.5 | 2 | 2 | 2.2 | 3 | 3 | 3 | 4 | 4 | 4 |
Length | 4 | 2.5 | 10 | 10 | 3.5 | 4 | 10 | 30 | 4 | 6 | 10 |
Double rond bore ceramic beads
ID | 2 | 3 | 4 | 6 | 7 | 9 | 1.2 | 1.2 | 1.5 | 2 | 2 |
OD | 5 | 7 | 9 | 11 | 13 | 15 | 5 | 5 | 7 | 8 | 9 |
Length | 5 | 7 | 9 | 11 | 13 | 15 | 10 | 35 | 10 | 25 | 50 |
Oval double bore ceramic beads
Dia of bore | 2.5 | 3.5 | 3.5 | 4 | 4 |
Long dia. | 9 | 10 | 10 | 13 | 13 |
Oval dia. | 7 | 8 | 8 | 10 | 10 |
Length | 25 | 20 | 20 | 25 | 25 |
Property of material:
| 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 |
Other information:
| Feature | Application | Main usage |
| 1.Great mechanical strength | Electric appliance industry Automotive industry | 1.Heat treatment furnace and toughened furnace |
| 2.High softening temperature | ||
| 3.Good resistance to thermal impact | ||
| 4.Small thermal expansion coefficient | Mechanical industry Engineer industry | 2.Inner liner tube and heating tube in electric furnace |
| 5.Good chill and abrupt heat properties | ||
| 6. Resistance to acid and alkali corrosion |
1, 2, 4 Hole Ceramic Insulator Tubes