Custom ceramic manufacturing
Custom Alumina Ceramic Parts Manufacturer
The general-purpose engineering ceramic. Chosen when the requirement is wear resistance, electrical insulation or chemical resistance, and the budget is a factor.
- Drawing-based customization — every part produced to your drawing, not stock
- Prototype-to-production — one-off evaluation parts through repeat production
- Precision machining & inspection — diamond grinding and documented verification
What we manufacture
Custom Alumina Components We Manufacture
Precision alumina components manufactured to customer drawings, with geometry and critical features evaluated against application requirements.
Insulating Bushings & Rings
Electrical isolation and precise positioning in powered assemblies.
- Bore, wall and face geometry to the drawing
- Ground seating faces
Bushings & Sleeves
Wear-resistant, electrically insulating sleeves.
- Straight and stepped bores
- OD/ID concentricity to the drawing
Precision Ceramic Tubes
Insulating and guiding tubes for thermal and electrical service.
- Straight and stepped bores
- Ground bores and faces
Custom Machined Components
Non-standard geometry from your drawing — blocks, brackets, standoffs.
- Compound datums held
- One-off to production quantities
Wear Plates, Tiles & Special Forms
Abrasion surfaces and custom profiles for wear duty.
- Plates, tiles and honeycomb forms
- Same-batch consistency
Insulators, Standoffs & Complex Geometries
Confirmed component types produced where the drawing calls for them.
- Feature-specific geometry review
- Material confirmed in writing with quotation
Engineering problems we help solve
Engineering Challenges Addressed with Custom Alumina
| Property | Engineering benefit | Relevant application condition |
|---|---|---|
| Vickers hardness 1600 to 1750 HV1 | Wear resistance in sliding and abrasive contact | Conveying, guiding and pumping duty |
| Volume resistivity 10<sup>14</sup> Ω·cm | Dependable electrical insulation | Live hardware, sensors and standoffs |
| Broad chemical resistance | Survives chemically active media | Pump, valve and sensor service |
| Moderate material and processing cost | Lower total cost than specialty ceramics | Volume production where no single requirement dominates |
How it works
From Your Drawing to Finished Alumina Components
You submit the drawing. We evaluate manufacturability. The component is made and inspected to the agreed specification.
Precision & inspection
Precision Machining and Inspection for Alumina Parts
Confirmed capability figures
The figures below are this shop’s confirmed manufacturing capability, quoted in this material’s context. They are feature-specific capability references, not blanket tolerances for every material or geometry.
These values are feature-specific capability references, not blanket tolerances for every material or geometry. Achievability depends on material, part size, wall thickness, feature geometry, datum scheme and finishing process. Final capability is confirmed during drawing review.
The machining route behind these figures is described under precision grinding, and the equipment that verifies them under inspection and metrology.
Engineering essentials
Alumina Grades & Engineering Essentials
Material Grade Selection
Representative published values for material selection. Where a property governs the design, state it on the drawing so it is confirmed against the supplied batch.
Material properties are representative and grade-dependent. Final material selection should be confirmed against the specific grade and application conditions. The inspection certificate for the batch supplied is the governing document for a delivered order.
These are grade identifiers, not universal performance promises. Material properties depend on grade and supplier/batch; final selection is confirmed against real application conditions and the supplier’s data sheet.
View Full Engineering PropertiesAlumina against Zirconia
Strength in bending and heat removal separate the range faster than any other pair of properties. Each bar is the range published for that material family, taken from the same comparison table that appears in the selection centre.
Flexural strength, MPa — Alumina (Al2O3), 95-99.7%: 300 – 380 · Zirconia (ZrO2): 500 – 900
A longer bar carries more load before it breaks. A range covers the grades supplied in that family rather than one nominal figure.
Source: Flexural strength (MPa)
Thermal conductivity, W/m·K — Alumina (Al2O3), 95-99.7%: 20 – 32 · Zirconia (ZrO2): 2.5 – 3
A longer bar moves heat away faster. Conducting heat while still insulating electrically is the pairing power electronics needs, and it is why this property is read next to strength.
Source: Thermal conductivity (W/m·K)
What it is not good at
Stating this up front prevents a material being selected for the one thing it cannot do.
- Lower fracture toughness than zirconia, so it chips under impact rather than deforming
- Poor thermal shock resistance compared with silicon carbide or silicon nitride
- Low thermal conductivity, which rules it out where heat has to be moved away
- Hardness makes it slow to grind, so tight tolerances carry a real cost in cycle time
Questions
Frequently Asked Questions About Custom Alumina Parts
Which alumina grade should I specify?
Send the requirement rather than the grade. Purity and density follow from what the part has to do, and over-specifying the grade adds cost without improving performance.
Is alumina suitable for a sealing face?
It can be, at a lapped finish. If the seal sees impact or high face load, zirconia is usually the better pairing because it is less likely to chip.
Can alumina be used at high temperature?
Yes, but its thermal shock resistance is limited. Where the part is cycled rapidly, silicon carbide or silicon nitride is the usual alternative.
Request a quote
Request a Quote for Custom Alumina Ceramic Parts
Send the drawing, the material grade if it is fixed, the quantity, the critical dimensions and tolerances, the required surface finish and the operating environment. The material is confirmed in writing with the quotation.
Engineering reference
Engineering Reference Library
Complete material engineering detail, retained on this page. Open a group for the full reference.
Material Fundamentals & Selection
Material overview
What is alumina ceramic?
Alumina (Al2O3) is an oxide ceramic of aluminium and oxygen, supplied in grades from 95% to 99.7% purity, sintered into a dense technical ceramic and then diamond ground to the drawing. Published typical values across the grade range are a density of 3.7 to 3.9 g/cm³, a Vickers hardness of 1600 to 1750 HV1 and a flexural strength of 300 to 380 MPa. It is the general-purpose engineering ceramic: specified where wear resistance, electrical insulation or chemical resistance is the requirement and cost is a factor. Insulators, bushings, wear plates, tubes and sleeves are the common product forms.
When to choose Alumina
Each row links a published property to the engineering benefit it buys and the condition where that benefit is the reason for the choice.
| Property | Engineering benefit | Relevant application condition |
|---|---|---|
| Vickers hardness 1600 to 1750 HV1 | Wear resistance in sliding and abrasive contact | Conveying, guiding and pumping duty |
| Volume resistivity 10<sup>14</sup> Ω·cm | Dependable electrical insulation | Live hardware, sensors and standoffs |
| Broad chemical resistance | Survives chemically active media | Pump, valve and sensor service |
| Moderate material and processing cost | Lower total cost than specialty ceramics | Volume production where no single requirement dominates |
If your project looks like one of these
- Electrical insulators, bushings and standoffs
- Wear plates, liners and guide components
- Pump and valve parts in chemically active service
- Tubes, sleeves and protection sheaths
- General precision parts where no other requirement dominates
Alumina is the default where a part has to insulate, so the design considerations that come with that requirement are collected under electrical insulation components. Where abrasive contact is the reason for changing material rather than insulation, that case is made under wear and friction components. The shapes it is most often ordered in are grouped under tubes and sleeves and bushings. Where the part is cycled rapidly, or has to survive impact, the choice moves to silicon carbide or silicon nitride.
Why engineers select it
Each of these is a reason to choose it. The limitations that follow are the reason not to.
- High hardness gives good wear resistance at a moderate cost
- Dependable electrical insulation, with volume resistivity published at 1014 Ω·cm at room temperature
- Broad chemical resistance across acids, alkalis and solvents
- Good dimensional stability, and it holds a ground surface well
- Wide grade range, from standard to high purity, so the material can be matched to the requirement rather than over-specified
Complete Alumina Grade & Property Matrix
| Property | 95% Al2O3 | 96% Al2O3 | 99% Al2O3 | 99.5% Al2O3 | 99.7% Al2O3 |
|---|---|---|---|---|---|
| Colour | White | White | Ivory | Ivory | Ivory |
| Density (g/cm³) | 3.7 | 3.7 | 3.85 | 3.9 | 3.9 |
| Elastic modulus, 20 °C (GPa) | 270 | 275 | 370 | 370 | 380 |
| Vickers hardness HV1 (kg/mm²) | 1600 | 1600 | 1600 | 1650 | 1750 |
| Thermal expansion coefficient (×10⁻⁶/K) | 6.5 | 6.5 | 7.6 | 7.2 | 7.2 |
| Thermal conductivity, 20 °C (W/m·K) | 20 | 25 | 27.5 | 32 | 32 |
| Volume resistivity, 20 °C (Ω·cm) | 1014 | 1014 | 1014 | 1014 | 1014 |
| Dielectric strength (kV/mm) | >20 | >20 | >25 | >25 | >25 |
| Dielectric constant, 1 MHz, RT | 9 | 9 | 9.1 | 9.9 | 9.9 |
| Dielectric loss tan δ, 1 MHz, 20 °C | 3×10-4 | 2×10-4 | 3×10-4 | 1×10-4 | 1×10-4 |
Grade-independent ranges
| Property | Value across the range |
|---|---|
| Flexural strength, 20 °C (MPa) | 300 – 380 |
| Compressive strength, 20 °C (MPa) | 2000 – 2350 |
| Fracture toughness, 20 °C (MPa√m) | 3.5 – 4 |
| Poisson’s ratio, 20 °C | 0.2 – 0.22 |
| Rockwell hardness HRA | 90 |
| Thermal shock resistance (ΔT, °C) | 200 – 250 |
| Specific heat (J/g·K) | 0.78 – 0.79 |
| Maximum use temperature, in air (°C) | 1600 – 1650 |
Material engineering reference: Alumina (Al2O3) for Custom Precision Components
Applications & Alternative Ceramics
Alumina in service
The sectors below are the ones that specify this material, with the component that carries the requirement and the material property that earns the place. Each entry opens the sector page for the full component list.
A sector that is not listed is not a sector that is refused. It means the material has not been the obvious answer there, and the review starts from the operating condition instead.
What to compare it against
These are the alternatives that most often come up against Alumina, with the reason each might be preferred.
What is produced in this material
What is produced in this material
Insulating bushings and rings
Wear plates in conveying equipment
Protection tubes for sensors
Pump plungers and valve seats
Precision spacers and standoffs
Profiled and contoured shaped parts
Electronic insulator components and terminal bodies
Insulating discs, washers and spacers
Manufacturing & Design Considerations
What the material costs in production
The material decision and the manufacturing route are the same decision seen from two ends. Green machining, diamond grinding, lapping and polishing each have a place, and the route depends on the geometry and the tolerance.
- Diamond grinding is the only practical route for fired material
- Mechanical behaviour in grinding depends on purity, grain structure, additives, density and the processing route, so purity alone is not used as a predictor of how a grade machines; the response of the specific grade is confirmed during process development rather than assumed
- Green machining before firing is used for complex shapes, with grinding afterwards to establish final tolerance
- Edge chipping is the dominant defect, so the edge criterion is agreed rather than assumed
What to expect on the drawing
Tolerance and finish are specified per feature. An overall callout on the whole part is the most common cause of an unnecessarily expensive quotation.
Tolerance considerations
- Tolerances on functional features are reached by diamond grinding on fired material
- Thin sections and long small bores are the features where the achievable tolerance falls short of the machine capability
- Firing shrinkage means near-net shapes cannot hold final tolerance without a grinding operation afterwards
Surface finish considerations
- As-ground finish is adequate for non-functional surfaces
- Lapping and polishing are applied to sealing faces and sliding surfaces
- A finer finish raises cost significantly because it is a separate sequence, so it is specified per surface rather than overall
Inspection & Technical Documentation
How critical features are verified
Insulation and wear parts in alumina are dimensionally straightforward; the features that decide acceptance are usually bores, wall thicknesses and edge condition.
- Datum faces and hole positions are measured on the CMM; small features go to the video system when a probe cannot reach them
- Bores on bushings and sleeves are checked for roundness where the fit carries the function
- Edge condition on ground faces is inspected at magnification, because edge chipping is the dominant defect in this material
- Surface finish is verified on lapped faces only, where the drawing calls it out
The equipment behind these methods is listed on the inspection and metrology page.
Technical documents
No file on this page is offered as a download, because each document is generated against the grade and the drawing on the order. What can be issued, and when, is listed here instead.
| Document | Applies to | Format | Issued |
|---|---|---|---|
| Material grade certificate | The grade the part is produced from | With the shipment | |
| Dimensional inspection record | The dimensions called out on the drawing | With the shipment | |
| Certificate of conformity | The finished part, against the drawing | With the shipment | |
| First article inspection report | The first part produced to a new drawing | On request; method agreed at quotation | |
| Material property data for the selected grade | The grade in question | On request, or from the material manufacturer |
A document that is not on this list is not refused by default; it is quoted once the method behind it has been confirmed. State what your incoming inspection will check, and the document set is agreed before the order is placed.