Custom Alumina Ceramic Tubes for Size, Bore Layout and Application RFQs
ADCERAX reviews and supplies custom alumina ceramic tubes in open-end, closed-end, single-bore and multi-bore forms, with common OD/ID 2-120 mm, length 10-3500 mm and wall 0.5-20 mm drawing-review ranges.
For furnace, thermocouple protection, insulation and process-equipment RFQs, tube type, bore layout, material grade, temperature, atmosphere and application are checked before quotation.
Send a drawing, old tube photo or sample with OD, ID, length, wall thickness, bore layout, material grade, working temperature, atmosphere, application and quantity for review.
Product Fit
Open-end, closed-end, single-bore and multi-bore alumina tubes
Size Range
OD/ID 2-120 mm, length 10-3500 mm, wall 0.5-20 mm review range
Drawing, sample and old-tube photo review before quotation
Alumina ceramic tubes are precision tubes made from high-purity aluminium oxide (Al₂O₃), used where parts must handle high temperature, electrical insulation, wear and chemical exposure. They are supplied as open-end, closed-end, single-bore and multi-bore forms for furnace work tubes, thermocouple protection, sensor and heater insulation, and drawing-based custom parts.
What Are Alumina Ceramic Tubes？
Alumina Tube Types & Functions
Select the tube structure by application first: open-end tubes for furnace or process flow, closed-end tubes for thermocouple and sensor protection, single-bore tubes for insulation or routing, and multi-bore tubes for separating conductors or sensor channels.
Alumina Tube Style
Standard Alumina Single Bore Tubes
For gas passage, furnace work tubes and insulation sleeves.
✏️Send OD, ID, length and working conditions.
Closed-One-End Alumina Ceramic Tube
One end sealed, for thermocouple and sensor protection.
✏️Send insertion length, closed-end geometry and sensor size.
Square Alumina Tube (Al₂O₃ Tube)
For electrode, structural and custom slot assemblies.
✏️Send bore count, bore diameter and pitch.
Custom Single-Bore Alumina Tube
Customizable as flanged, stepped, threaded or slotted.
✏️Send a drawing with OD, ID and length.
Double Bore/2-hole Alumina Tube
For thermocouple protection and dual-channel sampling.
✏️Send bore diameter, pitch and OD.
Four-Bore / 4-Hole Alumina Tube
For dual-channel thermocouples and electrical isolation.
✏️Send bore count, dia and pitch.
Industrial 9-Hole Alumina Tube
For multi-sensor and multi-path instrumentation
✏️Send bore layout, dia and pitch.
Custom Multi-Bore Alumina Tube
For complex sensor and conductor assemblies.
✏️Send bore count and layout.
Alumina Tube Function
Porous Alumina Tube
For filtration, gas diffusion and pressure equalization.
✏️Send medium, flow need and dimensions.
Alumina Furnace Tube
For tube-furnace work zones and thermal processing.
✏️Send OD, ID, length, support span and atmosphere.
Alumina Lined Pipe
For abrasion and corrosion resistance in fluid systems.
✏️Send pipe size, medium and wear condition.
Alumina Insulation Tube
For electrical isolation and thermal-barrier assemblies.
✏️Send voltage/insulation need, bore layout and assembly context.
Alumina Tube Sizes We Can Review
Send your drawing, old-part photo or target dimensions first. ADCERAX reviews alumina tube size feasibility together with bore layout, wall thickness, straightness, material grade and working conditions before quotation.
| Specification / RFQ item | ADCERAX review range or note | What to send for review | Why it matters |
|---|---|---|---|
| Outer / inner diameter | Common custom review range: 2-120 mm | OD, ID, drawing or old-part photo | Confirms tube fit, bore clearance and forming feasibility |
| Length | 10-3500 mm, depending on section, straightness and firing route | Total length, support span, insertion length if used in furnace or sensor assemblies | Long tubes need straightness, handling and firing-route review |
| Wall thickness | 0.5-20 mm, reviewed with OD/ID and length together | Wall thickness, pressure/load condition if relevant | Thin-wall and long-tube combinations need case-by-case review |
| Bore layout | Single-bore, 2-hole, multi-bore and custom bore layouts can be reviewed from drawings | Bore count, bore diameter, pitch, conductor/sensor size and cross-section drawing | Bore geometry controls insulation, fit and manufacturability |
| Tolerance / straightness | Up to ±0.005 mm tolerance review for precision assemblies. Use drawing tolerance first; long tubes and tight straightness requirements require engineering review. | Critical tolerance, straightness requirement and inspection priority | Prevents quoting a tube that cannot meet assembly or furnace alignment needs |
| Material grade | 95%, 99%, 99.5%, 99.7% Al₂O₃ (context-dependent) | Requested alumina grade, working temperature, atmosphere and contact media | Helps match ceramic material to thermal, electrical or chemical conditions |
| End design | Open-end, closed-end and shaped ends can be reviewed by drawing | End type, closed-end geometry, chamfer, slot or special feature | End geometry affects firing, assembly fit and use in thermocouple or protection designs |
| Quantity and project stage | Prototype, replacement, trial batch and repeat order should be marked clearly | Quantity, target delivery stage, replacement urgency and old sample/photo if available | Helps ADCERAX respond with the right review depth and quotation route |
Note:These ranges are used for RFQ screening, not a guarantee that every diameter, wall thickness and length combination can be produced.
🔹Why alumina: a dense, electrically insulating, chemically stable work tube that holds samples and separates the hot zone in tube furnaces and thermal processing.
🔹What to confirm: working temperature, atmosphere (air / inert / reducing / vacuum), heating & cooling rate, support method and sealing.
🔹Why alumina: a closed-one-end ceramic sheath that protects a thermocouple or sensor from furnace gases while keeping it electrically isolated.
🔹What to confirm: sensor diameter, insertion length, open or closed end, mounting and temperature.
🔹Why alumina: single- or multi-bore tubes route and isolate multiple conductors, heater wires or sensor leads.
🔹What to confirm: bore count, bore diameter, centre spacing and OD.
🔹Why alumina: chemically stable tubing for reaction channels, gas delivery and fluid transport in demanding environments.
🔹What to confirm: medium, atmosphere, pressure and sealing interface.
Alumina Tube Applications
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.
Not sure which alumina tube fits your application?
Send your application, operating temperature, bore count and tube dimensions,
and our engineers will recommend the right tube type, material grade and end form — then prepare a drawing-based RFQ for your exact part.
Alumina Tube Material Grades & Key Properties
ADCERAX offers custom alumina ceramic tubes in 95%, 99% and 99.7% Al2O3, with material selection based on operating temperature, insulation requirements, wear conditions, atmosphere and application environment.
Key Properties of Alumina Tube:
Stable structure and dimensions for furnace, kiln and thermal-processing service.
Resists abrasion and wear to extend component life in demanding duty.
Strong dielectric performance for sensor, heater and conductor isolation.
Resists attack from many acids, alkalis and process atmospheres.
Typical Properties of Alumina Ceramic Tube by ADCERAX Grade (TDS)
Values below follow ADCERAX alumina C795–C799 grade comparison TDS. Typical engineering data for RFQ screening — final purity, certificates and inspection documents are confirmed per order. Long-term temperature depends on load, atmosphere, thermal cycle, support span and installation.
| Property | AD-ALU-999 | AD-ALU-997 | AD-ALU-995 | AD-ALU-990 | AD-ALU-950 |
|---|---|---|---|---|---|
| Al₂O₃ (wt%) | 99.90 | 99.70 | 99.50 | 99.00 | 95 |
| IEC class | C799 | C799 | C799 | C795 | C795 |
| Density (g/cm³) | 3.94 | 3.94 | 3.90–3.92 | 3.80–3.91 | 3.75 |
| Flexural strength (MPa, 20°C) | 315–340 | 330 | 320–350 | 300–320 | 280 |
| Thermal conductivity (W/(m·K), 25°C) | 35–42 | 35–40 | 30–38 | 24 | 18–25 |
| CTE (10⁻⁶/K, 25–800°C) | 7.6 | 7.6 | 7.6 | 7.2 | 7.6 |
| Long-term use temperature (°C, typical review) | 1750 | 1700 | 1650 | 1600 | 1400 |
| Dielectric strength (kV/mm, 5 mm) | 10 | 10 | 10 | 10 | 10 |
| Mohs hardness | 9 | 9 | 9 | 9 | 9 |
| Tube straightness | — | 1 mm/m | 1 mm/m | 1 mm/m | 1 mm/m |
Source: ADCERAX alumina ceramic C795–C799 grade comparison technical data sheet. RFQ grades: AD-ALU-950 / 990 / 995 / 997 / 999.
Not sure which grade — and worried about over-spec or early failure?
Send your temperature, atmosphere and environment, and we match the right alumina grade (95/ 99 / 99.7%) so tubes last without overpaying.
Custom Alumina Ceramic Tubes — Built to Your Drawing
Every alumina tube we make is custom — built to your drawing, sample or application, not a fixed catalog part. We review geometry, material and working conditions before quoting.
What Can We Customize?
Dimensions:Custom OD, ID, length and wall thickness to your drawing
Forms :Open-end, closed-one-end, single-bore, multi-bore (2 / 4 / 9), square
Features :Flanged, stepped, threaded, slotted, ground precision, cut-to-length
Material:95 / 99 / 99.5 / 99.7% Al₂O₃, selected by application
Batch:Prototype and small-batch friendly
Three Ways to Start Your Custom Alumina Tube
From a drawing or CAD file
— send a PDF, STEP or DWG.
From a sample or old part
— send measurements or a photo to match.
From your application only
— tell us the conditions and we recommend a type and spec.
Why Choose ADCERAX — Your Alumina Ceramic Tube Manufacturer & Supplier
ADCERAX manufactures custom alumina ceramic tubes in China, reviewing specifications and operating conditions before quoting. We export to the US, UK, Germany, France, Canada, Australia and Japan.
We review your drawing, old-tube photo or sample for OD, ID, length, wall thickness, bore layout, material grade, tolerance and working-condition feasibility before quotation.
Alumina grade (95%, 99%, 99.5% or 99.7%) and tube form are reviewed against operating temperature, atmosphere, insulation, wear and contamination requirements.
Open-end, closed-end, bore layout, support span, straightness and machining tolerance are reviewed together with the drawing and firing route.
Dimensions and material requirements are reviewed before shipment, with protective export packing planned by tube length, quantity and destination.
One-Stop Custom Alumina Tube Supplier | ADCERAX
ADCERAX manufactures custom alumina ceramic tubes from drawings, samples or working conditions. Forming and machining routes are selected by tube geometry, grade, length, bore layout, tolerance and quantity. Tolerance up to ±0.005 mm is reviewed for the specific drawing; long tubes and tight straightness requirements require engineering review.
- Alumina purity selected by working condition: 95 / 99 / 99.5 / 99.7% Al₂O₃
- Custom parts based on your drawings or samples
- Prototype review is typically 7–15 days; production timing and order quantity are confirmed for the specific RFQ.
- ISO 9001 quality management system, with dimensional inspection and material review before shipment
- Direct engineering support from design to delivery
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 | 95%, 99%, 99.5%, 99.7% Al₂O₃ – high purity for demanding applications |
| Tolerances | Up to ±0.005mm – suitable for precision assemblies |
| Forming Methods | Dry pressing, isostatic pressing, extrusion, casting, injection molding |
| Machining | CNC grinding, ID honing, drilling, slotting, polishing |
| Customization | Drawings, CAD files, or samples accepted for custom parts |
Alumina Tubes FAQ
ADCERAX can review common custom OD/ID ranges of 2-120 mm, lengths of 10-3500 mm and wall thicknesses of 0.5-20 mm. Final feasibility depends on tube geometry, straightness, wall thickness, material grade, firing route and working conditions.
Send a drawing or old-part photo, OD, ID, length, wall thickness, bore count, tolerance, material or purity requirement, operating temperature, atmosphere, application, quantity and target country.
ADCERAX can review drawings, sketches, samples or old-part measurements for material, dimensions, tolerance and application fit before quotation. For replacement tubes, send old-part photos, equipment context and failure information; ADCERAX does not claim universal drop-in compatibility.
Choose by application and structure: open-end tubes for passage or furnace work tube discussions, closed-end tubes for thermocouple or sensor protection, single-bore tubes for simple insulation or routing, and multi-bore tubes for separating multiple conductors or sensor channels. Send application, temperature, bore layout, drawing or old-part photo for review.
A single-bore alumina tube has one central passage for insulation, protection or flow-through use. A multi-bore alumina tube has two or more parallel bores for separating conductors, thermocouples or sensor channels. Send bore count, bore diameter, pitch, OD, length and a cross-section drawing for review.
Furnace work tubes are usually open-end tubes selected by OD, ID, length, support span, temperature, atmosphere and heating cycle. Thermocouple protection tubes are usually closed-end tubes selected by insertion length, sensor size, closed-end geometry and working conditions.
Start from temperature, atmosphere, electrical insulation, wear, corrosion and purity requirements. If the grade is not fixed, ADCERAX can discuss material options during RFQ review.
ADCERAX is a China-based manufacturer of custom alumina ceramic tubes (factory-direct),not a trading company. We review your drawing, material grade and working conditions before quoting.
Yes. ADCERAX exports custom alumina tubes to markets including the US, UK, Germany, France, Canada, Australia and Japan, with drawing-based review before each quotation.
What to send for a custom alumina ceramic tube RFQ:
To quote an alumina ceramic tube, please send:
- Material / purity requirement (if known)
- OD, ID and length
- Wall thickness
- Bore count and bore diameter (for multi-bore tubes)
- Open both ends or closed one end
- Operating temperature and atmosphere
- Heating / cooling rate or thermal cycling
- Target application
- Drawing, sketch or photo of the old part
- Quantity and target country
Send what you have — even a drawing or a sample is enough to start. Our engineers review material, tolerance and feasibility before quoting.
*Our team will answer your inquiries within 24 hours.
*Your information will be kept strictly confidential.
info@adcerax.com
Tel:+86-0731-84428843
WhatsApp:+86 19311583352
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