Custom Alumina
Ceramic Tubes
Precision ceramic tubes engineered for electrical insulation, thermal stability, wear resistance and demanding industrial environments. Available from prototype quantities through repeat production.
Custom Alumina Ceramic Tubes Built to Your Drawing.
UNIPRETEC supplies custom alumina ceramic tubes in multiple diameters, lengths, wall thicknesses and material grades for demanding industrial applications.
Custom Dimensions
OD, ID, length, wall thickness and end geometry can be customized to your drawing requirements.
Precision Finishing
As-fired and precision-ground routes are available according to functional dimensions and tolerance requirements.
Multiple Alumina Grades
95%–99.8% alumina options support different insulation, temperature, wear and purity requirements.
Electrical insulation, furnace protection, wear sleeves and industrial process equipment.
Recommended for severe impact, extreme thermal shock or unusually thin long-wall designs.
Technical Data for Alumina Ceramic Tube Selection.
Compare alumina grades, dimensional routes and finishing options before defining the drawing and RFQ requirements for your ceramic tube project.
| Property | 95% Alumina | 99% Alumina | 99.5% Alumina | Unit | Selection Relevance |
|---|---|---|---|---|---|
| Alumina Content | ≥95 | ≥99 | ≥99.5 | % | Purity / Cost Balance |
| Density | 3.60–3.75 | 3.80–3.92 | 3.88–3.95 | g/cm³ | Density and structural consistency |
| Flexural Strength | 250–330 | 280–350 | 300–350 | MPa | Mechanical loading and component strength |
| Thermal Conductivity | 20–25 | 25–30 | 28–33 | W/m·K | Heat transfer and thermal response |
| Dielectric Strength | 8–10 | 8.5–11 | 8.5–11 | kV/mm | Electrical insulation performance |
| Maximum Service Temperature | 1500–1600 | 1600–1700 | 1650–1700 | °C | Atmosphere, loading and thermal cycling must be considered |
| Feature | As-Fired Route | Ground Route | Key Dependency | Drawing Guidance |
|---|---|---|---|---|
| Outside Diameter | Standard process tolerance | Precision grinding available | Diameter, length and wall section | Identify the functional datum |
| Inside Diameter | Standard process tolerance | Geometry-dependent grinding | Bore diameter, depth and tool access | Define the functional bore |
| Length | Cut or as-fired route | End-face grinding available | Section thickness and straightness | Specify squareness when critical |
| Concentricity | Process-dependent | Precision control can be evaluated | OD / ID grinding strategy | Identify the controlled diameter |
| Surface Roughness | As-fired surface | Ground or lapped finish | Surface accessibility | Specify only on functional surfaces |
| Operation | Availability | Typical Purpose | Engineering Review Point |
|---|---|---|---|
| OD Precision Grinding | Available | Diameter, roundness and surface control | Length-to-diameter ratio |
| ID Grinding | Feasibility review | Bore fit and concentricity | Bore diameter, depth and tool access |
| Lapping / Polishing | Selected surfaces | Surface finish, friction and sealing | Accessible face and finish requirement |
| Chamfer / Radius | Available | Edge protection and assembly | Feature size and geometry |
| Dimensional Inspection | Available | FAI or batch inspection reporting | Agreed critical-to-quality dimensions |
Choose alumina purity by performance and process requirements.
Higher purity is not automatically the best option. Select the grade that meets the actual electrical, thermal, chemical, cleanliness and commercial target.
Balanced route for many industrial insulation and wear applications where ultra-high purity is not necessary.
- Cost positionLower
- Typical focusIndustrial duty
- Selection noteValue-driven
Improved purity for applications requiring a stronger balance of dielectric, cleanliness and temperature performance.
- Cost positionMedium
- Typical focusElectrical / thermal
- Selection noteBalanced purity
A common engineering choice when high purity, dimensional finishing and demanding process conditions must be combined.
- Cost positionMedium–high
- Typical focusPrecision systems
- Selection noteRecommended start
For applications where purity, contamination control or demanding electrical and thermal requirements justify the premium.
- Cost positionHighest
- Typical focusCritical purity
- Selection noteUse when justified
99.5% Alumina is selected in this preview. In production, this choice can prefill the engineering RFQ.
Use Selected Grade
Define the component by function, datum and critical dimensions.
A clear drawing allows engineering to separate economical as-fired dimensions from features that genuinely need secondary grinding or inspection reporting.
Where Alumina Ceramic Tubes Perform Best.
From electrical isolation to heat protection and chemical-process equipment, alumina ceramic tubes can be engineered around the operating environment, required purity and dimensional demands.
Semiconductor Equipment
Alumina ceramic tubes provide electrically insulating and dimensionally stable interfaces for precision semiconductor and automated processing equipment.
High-Temperature Protection
Ceramic tubes can be used as protective and insulating components around equipment exposed to elevated temperatures and controlled furnace environments.
Fluid & Chemical Handling
Alumina ceramic tubes can serve as wear-resistant and chemically stable interfaces in pumps, dosing systems, sensors and process equipment.
From forming to final inspection.
Keep this section visual and credible. Replace each step with real factory photography when available.
Material Preparation
Grade, powder route and batch controls are established.
Forming
The component route is selected around shape and quantity.
Green Machining
Features are created before firing where technically sensible.
Sintering & Grinding
Critical dimensions are finished after sintering as required.
Inspection & Packing
Agreed CTQ dimensions, documentation and packaging are completed.
Quality Inspection for Critical Ceramic Tube Dimensions.
Critical dimensions can be defined from your drawing and verified according to the agreed inspection scope before shipment.
Alumina Ceramic Tube FAQs for Engineering Review.
For many industrial ceramic tube applications, 95%–99.5% alumina provides a practical balance of performance and cost. Higher-purity grades such as 99.8% alumina are better suited when electrical insulation, cleanliness, chemical stability or contamination control is more demanding; final selection should follow the actual operating environment.
Yes — OD grinding is a standard secondary-finishing option, while ID grinding can also be evaluated for suitable tube geometries. ID feasibility depends mainly on bore diameter, grinding depth, wall thickness and tool access, so these dimensions should be identified clearly on the drawing before quotation.
Dimensions that directly control fit, alignment, sealing or electrical function should be treated as critical-to-quality features. Typical examples include mating OD or ID, end-face position, straightness and concentricity; non-functional dimensions should use practical tolerances to avoid unnecessary grinding, inspection time and manufacturing cost.
A drawing or dimensioned sketch is the best starting point for an accurate ceramic tube quotation. Include the preferred alumina grade, OD, ID, length, critical tolerances, surface requirements, operating conditions, prototype quantity and expected production volume; inspection or documentation requirements should also be stated at the RFQ stage.
Yes — prototype or pilot quantities can be evaluated before repeat production when the selected material, geometry and manufacturing route allow it. Specify whether the prototype is intended for dimensional approval, assembly testing or application validation, because the purpose of the prototype can affect tooling, finishing and inspection requirements.
Send Your Drawing for Ceramic Tube Evaluation
Share your drawing or application requirements. Our engineers will review material selection, dimensions and manufacturing feasibility.