ADCERAX is a leading alumina ceramic tube supplier in China, offering high-performance alumina tubes for sale at competitive factory prices. Our products deliver excellent high-temperature resistance, electrical insulation, and chemical stability—ideal for thermocouple protection, furnace systems, laboratory equipment, and industrial insulation.
We provide both standard and custom alumina tube sizes with tight tolerances to meet your exact specifications. Buy alumina tubes from ADCERAX for cost-effective, OEM-grade ceramic solutions.
✅500+ Global Customers ✅ISO 9001 Certified
✅ Samples Available ✅ No MOQ for Standard Sizes
1700°C
Max Operating Temp
Alumina tubes (also known as alumina ceramic tubes or alumina corundum tubes) are made primarily from α-phase aluminum oxide (Al₂O₃). Common purity levels include 96% alumina, 99% alumina, and high-purity grades ≥99.7%, depending on the application.
These ceramic pipes are formed through sintering processes, resulting in a dense, stable, and high-strength tubular structure ideal for demanding industrial environments.
| Available Purity Grades | |||
|---|---|---|---|
| Purity | Standard | Description | Grade |
| 96% Alumina | IEC C-786 / ASTM Type II | Cost-effective option for general high-temperature and wear applications | Standard |
| 99% Alumina | IEC C-795 / ASTM Type III | Improved strength and thermal stability for harsher conditions at a moderate price. | General |
| 99.7% Alumina | IEC C-799 / ASTM Type IV | 1730°C-capable alumina with superior insulation and inertness for vacuum, semiconductor, and other high-temp service. | High Purity |
Ceramic alumina tubes (Al₂O₃) are a highly versatile, advanced ceramic material with exceptional properties for high-performance industrial applications.
Our alumina tubes are manufactured in accordance with international standards:
• IEC 60672-3 – Ceramic and glass insulating materials
• ASTM D2442 – Alumina ceramics for electrical/electronic applications
• ASTM C980 – Thermocouple protection tubes
• ASTM C1862 – Joint strength test for ceramic tubes
Available grades: C-786 (96%), C-795 (99%), and C-799 (99.7%)
🔥Exceptional High-Temperature Resistance
Withstand continuous operating temperatures up to 1730°C for 99.7% purity grade
🛡️Superior Hardness & Wear Resistance
Excellent resistance to abrasion and wear, extending component lifespan
⚡Excellent Electrical Insulation
Superb electrical insulator with high dielectric strength
🧪High Chemical Inertness
Remarkable resistance to chemical attack from acids and alkalis
| Property | 96% Al₂O₃ | 99% Al₂O₃ | 99.7% Al₂O₃ |
|---|---|---|---|
| Density (g/cm³) | 3.65–3.8 | 3.8–3.9 | ≥3.93 |
| Flexural Strength (MPa) | 260 | 300 | 330 |
| Hardness (Mohs) | 8.8 | 9 | 9.1 |
| Thermal Conductivity (W/m·K) | 22 | 24 | 29 |
| Max Operating Temp (°C) | 1600 | 1680 | 1730 |
| Volume Resistivity (Ω·cm) | 10¹³–10¹⁵ | 10¹⁴–10¹⁵ | >10¹⁵ |
Material grades per IEC 60672-3: 96% (C-786), 99% (C-795), 99.7% (C-799)
Alumina ceramic tubes are the ideal choice when your application demands high-temperature stability, electrical insulation, and chemical resistance. Here’s when alumina tubes deliver the best performance:
| Your Application Requirement | Why Alumina Tubes Excel | Recommended Grade |
|---|---|---|
| Operating temperature >1100°C | Alumina maintains structural integrity up to 1700°C (99.7% grade), far exceeding most alternatives | 99% for ≤1600°C; 99.7% for >1600°C |
| Thermocouple protection (Type S/R/B) | Industry standard material for precious metal thermocouples; chemically inert, prevents contamination | 99.7% Al₂O₃, 2-bore or 4-bore |
| High-voltage electrical insulation | Volume resistivity >10¹⁵ Ω·cm; dielectric strength >15 kV/mm; maintains insulation at high temps | 99% or 99.7% Al₂O₃ |
| Furnace process tubes | Excellent dimensional stability under thermal cycling; low porosity prevents gas permeation | 99.7% for semiconductor; 99% for general |
| Mechanical strength under load at high temp | Flexural strength 330 MPa (99.7%); maintains >80% strength at 1200°C | 99.7% Al₂O₃ |
| Corrosive chemical environments | Excellent resistance to most acids, alkalis, and molten salts (except HF and hot phosphoric) | 99% or 99.7% Al₂O₃ |
| Vacuum or controlled atmosphere | Gas-tight structure; low outgassing; stable in reducing atmospheres | 99.7% Al₂O₃, verify porosity spec |
| Sample purity is critical | High-purity grades (99.7%+) minimize contamination in analytical and semiconductor applications | 99.7% Al₂O₃ |
| Application | Key Alumina Advantage | Typical Tube Configuration |
|---|---|---|
| Steel mill thermocouple protection | Survives 1500°C+ molten steel splash; 6+ month service life | 99.7%, OD 12-20mm, closed-end |
| Semiconductor diffusion furnace | Ultra-low particle generation; high purity prevents wafer contamination | 99.7%, OD 100-200mm, polished interior |
| Laboratory tube furnace | Chemically inert for accurate experimental results | 99%, OD 30-80mm, open both ends |
| High-voltage feedthrough insulation | Dielectric strength >15 kV/mm; no tracking or breakdown | 99%, OD 10-50mm, tight tolerance |
| Gas burner flame tubes | Withstands direct flame contact; thermal shock resistant with proper design | 96-99%, OD 20-60mm, thick wall |
| Chemical sampling probes | Resists corrosive gases and liquids; maintains sample purity | 99.7%, OD 6-15mm, closed-end |
If any of the cases below match your process, our engineers can recommend a better-fit ceramic option.
Rapid heating/cooling > 300°C/min requires higher shock tolerance.
If the tube must be transparent, alumina may not meet the requirement.
For low-temperature, cost-driven setups, alternative materials may be better.
We provide a comprehensive selection of alumina ceramic pipe types to suit a wide range of industrial, laboratory, and high-temperature applications. Whether you need single-bore, double-bore (2-hole), multi-bore, or closed-end alumina ceramic tubes, ADCERAX can meet your requirements.
Alumina tube open both ends for high-temperature and insulating use.
Ceramic alumina close one end tube use in sensor protection, vacuum systems, or furnace liners.
Square Alumina ceramic pipe for Structural Insulation or custom slot assemblies.
Customized alumina single bore tubes are available upon request, including flanged, stepped, threaded, slotted.
High quality 2-hole alumina tube Ideal for thermocouple protection and dual-channel sampling.
Alumina four bores tube for dual-channel thermocouples and electrical isolation.
High quality industrial alumina ceramic 9-hole tube for multi-sensor or multi-path instrumentation.
Alumina ceramic multiple-bore tubes for complex assemblies requiring multiple internal channels.
Alumina porous tube for Filtration, Gas Diffusion, or Pressure Equalization
Alumina tube furnace for High-Temp Heating and Thermal Processing
Alumina insulator tube for Abrasion and Corrosion Resistance in Fluid Systems
Alumina insulator tube for Electrical Isolation and Thermal Barrier Applications
Looking for a custom alumina tube supplier? We provide OEM solutions with fast delivery, precision machining, and expert support for your demanding application.
In a 1550°C reheat furnace, a Type S thermocouple required reliable protection, but the previous protection tubes were cracking from thermal shock and failing every 3–4 weeks.
ADCERAX supplied a 99.7% Al₂O₃ two-bore tube with a closed end (OD 12 mm × L 800 mm) as a direct replacement solution. After implementation, the tube service life was extended to over 6 months, reducing annual replacement costs by approximately $24,000.
In a 1200°C diffusion furnace operating in an ultra-clean environment, the process tubes began to degrade after about 500 hours, leading to particle contamination concerns.
ADCERAX provided a 99.7% Al₂O₃ furnace tube (OD 150 mm × ID 140 mm × L 1500 mm) with a polished interior to improve cleanliness and stability. After installation, tube life increased to over 2000 hours, and particle count was reduced by approximately 70%.
For a 15 kV electrical feedthrough operating at 300°C, the previous ceramic insulators suffered dielectric breakdown, creating reliability risks in service.
ADCERAX provided a 99% Al₂O₃ insulation tube (OD 25 mm × ID 18 mm × L 200 mm) manufactured to a ±0.02 mm tolerance to ensure stable fit and consistent insulation performance. After deployment, the system recorded zero dielectric failures over 18 months, and the part has since become the standard specification for all new units.
Our alumina furnace tubes are used as thermocouple protection tubes, sensor sleeves, and heating element liners in high-temperature environments up to 1700°C.
Precision alumina ceramic tubes for reaction vessels, sample tubes, and insulation components with chemical inertness and high purity.
Insulating alumina tubes are ideal for high-voltage feedthroughs, electrical isolators, and sensor protection sleeves in power electronics, control systems, and high-frequency devices.
Alumina ceramic components resistant to corrosive media for pump components, valve parts, and chemical system linings.
ADCERAX alumina tubes and ceramic parts are widely used to solve high-temperature insulation, wear resistance, corrosion resistance, and electrical isolation challenges across industrial and laboratory applications.
Extra-large / Extra-small diameters, non-standard thicknesses, and ultra-long / ultra-short lengths.
Provide higher - level dimensional accuracy and concentricity control than the standard.
Flanges, steps, threads, drilling holes, grooves, etc.
Adjust the material according to the application requirements.
Polish and grind the surface to achieve a specific surface roughness.
We specialize in custom alumina ceramic tubes with special sizes, tight tolerances, and complex features. OEM and small-batch support available. ADCERAX manufactures custom alumina tubes from as few as 3 pieces, with precision tolerances to ±0.01mm on critical dimensions.
Send us your drawing, CAD file, or physical sample with material grade, dimensions, tolerances, and quantity. Our engineers will evaluate the design and provide a detailed quotation with lead time and pricing.
Once the quote is approved, we proceed with sample prototyping (1–50 pcs) if needed, for testing and validation.
After sample approval or confirmation, we start batch production with CNC machining, sintering, and polishing. Every part is checked for dimensions, purity, and surface finish.
Finished products are securely packed and shipped via DHL/FedEx/UPS or your preferred method. We support global delivery with full documentation.
Our commitment to quality, flexibility, and customer-centric service sets us apart as your preferred partner for alumina ceramic tube solutions.
Competitive pricing with strict quality control from raw material sourcing to final delivery
Professional team providing comprehensive technical support and collaborative design
Small batch orders to large-scale production with complex geometries and tight tolerances
24-hour dispatch for standard items, 3-5 weeks for custom orders.
ADCERAX is a professional China alumina ceramics tube manufacturer that offers high-performance components with tight tolerances (±0.001mm) and custom geometries. Using advanced forming methods and CNC machining, we deliver precision-engineered solutions for electronics, chemical, and high-temperature applications.
This table highlights our core technical strengths, including material options, tight tolerances, and advanced manufacturing methods. We offer tailored solutions to meet diverse industrial requirements.
| Technical Capabilities Overview | |
|---|---|
| Material Grades | 96%, 99%, 99.5%, 99.7% Al₂O₃ – high purity for demanding applications |
| Tolerances | Up to ±0.001mm – suitable for precision assemblies |
| Forming Methods | Dry pressing, isostatic pressing, extrusion, casting, injection molding |
| Processing | CNC machining, fine grinding, polishing |
| Customization | Drawings, CAD files, or samples accepted for custom parts |
Yes. We have alumina ceramic tubes for sale in standard sizes, available for immediate shipment. We also support bulk orders and custom production for OEM clients.
Alumina tubes are commonly used in:
They are ideal for high-temperature, corrosive, and electrically sensitive environments.
Yes, they are gas-tight and chemically stable, ideal for vacuum and pressure systems.
Vacuum: They handle high vacuums (down to 10⁻⁷ Torr at 1400°C), resist outgassing, and insulate electrically, making them great for vacuum furnaces and feedthroughs.
High Pressure: Strong and corrosion-resistant, they withstand high pressure in reactors, gas systems, or sensor sheaths.
Key Features: High heat resistance (up to 1800°C), excellent insulation, and chemical stability.
Tips: Use high-purity alumina (99.7%–99.8%) for best results. Avoid sudden pressure changes to prevent cracking.
To get a custom alumina tube quote, please provide:
Sample orders: 2-3 weeks, Mass production: 3-5 weeks after sample approval (Detailed lead time depends on the complexity and specifications of the product), Standard products: 24-hour shipping from stock.
We do not recommend cutting alumina tubes yourself. Alumina is extremely hard and brittle. Improper handling may cause cracking or breakage.
Professional machining requires:
We suggest ordering pre-cut or custom-machined alumina tubes from ADCERAX.
Here's a simpler guide to keeping your alumina tubes clean and in good condition:
Safety & Handling:
Simple Cleaning:
Tougher Cleaning (Use Caution):
For baked-on stuff, very gentle scraping with plastic (NO METAL) might work.
For specific chemical residues, consult an Adcerax before using acids (NEVER Hydrofluoric Acid) or heat cleaning.
What NOT To Do:
NEVER use Hydrofluoric Acid (HF).
NO harsh scrubbing (like steel wool or sandpaper).
NO sudden hot/cold changes.
NO dropping or hitting.
Maintenance:
Following these steps helps keep your alumina tubes working well for longer. When in doubt, Please contact us.
Our alumina tubes are manufactured in accordance with:
We offer grades C-786 (96% Al₂O₃), C-795 (99% Al₂O₃), and C-799 (99.7% Al₂O₃) per IEC 60672-3 classification. Material test reports and certificates are available upon request.
Alumina tube pricing depends on several factors:
Contact us with your specifications for an accurate quote. We respond within 24 hours.
For standard sizes in stock: No MOQ — you can order as few as 1-5 pieces for testing.
For custom sizes: Typical MOQ is 10-50 pieces depending on complexity. We also support prototype orders of 1-5 pieces for validation before mass production.
We offer a range of standard alumina tubes in stock for customers who need fast delivery and reliable performance in high-temperature, insulation, laboratory, and industrial applications. The following standard models are currently available:
Standard Alumina Tubes - In Stock & Ready to Ship
| Part No. | OD (mm) | ID (mm) | Wall (mm) | Length (mm) | Purity | End Type |
|---|---|---|---|---|---|---|
| AT-06-04-300 | 6 | 4 | 1 | 300 | 99% | Open both ends |
| AT-08-05-500 | 8 | 5 | 1.5 | 500 | 99% | Open both ends |
| AT-10-06-500-C | 10 | 6 | 2 | 500 | 99% | Closed one end |
| AT-12-08-1000 | 12 | 8 | 2 | 1000 | 99% | Open both ends |
| AT-25-20-1000-HP | 25 | 20 | 2.5 | 1000 | 99.7% | Open both ends |
| AT-50-40-1500 | 50 | 40 | 5 | 1500 | 99% | Open both ends |
This is a partial list. Download full catalog or contact us for complete stock list.
Our engineers are ready to help you select the right tube for your application.
We believe that Adcerax will become your best partner!
Please fill in your contact information in the form or call us.
*Our team will answer your inquiries within 24 hours.
*Your information will be kept strictly confidential.
info@adcerax.com
+(86) 0731-74427743 | WhatsApp: +(86) 19311583352
Within 24 hours
The more details you provide, the faster we can respond.
*We respond within 24 hours. All inquiries are confidential.
The more details you provide, the faster we can quote.
*We respond within 24 hours. All inquiries are confidential.