Impervious high-purity sintered alumina furnace and process tubes for tube furnaces, CVD/annealing, and high-temperature thermal systems.
Recrystallized high-purity alumina (Al2O3) furnace tubes provide gas-tight atmosphere containment, high electrical resistivity, and chemical inertness under oxidizing, inert, vacuum, and dry reducing environments up to 1,750 °C. Slip-cast or isostatically pressed and sintered to near-zero open porosity, 99.5%–99.8% grades minimize alkali and silica volatilization during semiconductor annealing, powder calcination, and crystal growth.
Each lot is sourced to dimensional specification—including open-both-ends (OBE), closed-one-end (COE), ground end faces for O-ring vacuum flanges, and custom wall thicknesses—and ships with the manufacturer batch Certificate of Analysis (chemical assay and bulk density) plus pre-shipment dimensional verification.
| Property / Metric | Nominal Reference Value (Grade Dependent) |
|---|---|
| Max Working Temperature | 1,700–1,750 °C continuous (99.8% Al2O3, unloaded) |
| Bulk Density | 3.88–3.92 g/cm³ (impervious, <0.1% open porosity) |
| Flexural Strength (RT) | 330–380 MPa |
| Thermal Expansion (CTE) | 7.8–8.2 × 10⁻⁶ /K (20–1,000 °C) |
| Dielectric Strength | 14–17 kV/mm |
Reference values reflect typical sintered, fused, or wrought grades. Exact batch test figures are confirmed on your written quotation and accompanying lot Certificate of Analysis.
Specify outside diameter (OD), inside diameter (ID) or wall thickness, overall length, alumina grade (99.5% vs. 99.8%), open-both-ends (OBE) or closed-one-end (COE), straightness/camber tolerance, O-ring flange OD grinding needs, operating temperature, and ramp rate.
Include target quantity, destination country/postal code for express air freight calculation, and any special cleanroom bagging or certification requests.
Prepare Alumina Ceramic Tubes RFQ ↗Complementary furnaceware, substrates, PVD consumables, and refractory hardware frequently ordered together.
TB-AL2O3-TCImpervious C799 closed-end protection sheaths and multi-bore insulator rods safeguarding Type R, S, B, and K thermocouples in harsh thermal environments.
TB-AL2O3-BTHigh-purity open and lidded alumina sample boats sized to slide cleanly inside laboratory quartz and ceramic tube furnaces.
TB-SIO2-TUOptically clear 99.99% (4N) fused quartz process tubes for CVD graphene/2D growth, semiconductor diffusion, photochemistry, and rapid-quench tube furnaces up to 1,150 °C.
TB-ZRO2-CRTransformation-toughened 3Y-TZP structural zirconia parts and ultra-refractory YSZ/Mg-PSZ crucibles, setter plates, and tubes rated up to 2,100 °C.
Submit your purity grade, geometry, quantity, and documentation requirements. Every order includes the producing mill's batch Certificate of Analysis (COA) and pre-shipment dimensional verification.