Can you make an alumina part to our drawing or sample?

Yes. We make parts to a drawing or a sample by slip casting, pressing, extrusion or hot pressing: tubes, rods, crucibles, boats and special shapes.

What is the minimum order for a custom part?

Usually 100 pieces per item for a part made to your drawing or sample.

How long does a custom part take?

Usually 25–30 days to produce. The date is confirmed in the quotation.

Which material are custom parts made in?

Our standard is C799 alumina, 99.5% Al₂O₃, and we also make 95% white alumina. The material for each part is agreed in the quotation.

What should the drawing show?

OD, ID and length with tolerances, the Al₂O₃ grade, the ends, the quantity, and any insert or wire that has to pass through. PDF, DWG, DXF, STEP, IGES, PNG and JPG files all work.

What tolerances do you quote?

We set them from your drawing. As a guide, on our protection tubes we quote OD and ID to ±0.5 mm for OD 6–12 mm, ±0.6 mm for OD 15–17 mm, ±0.7 mm for OD 20 mm and ±1.0 mm for OD 24 mm, and length to ±1 mm. Mark the dimensions that matter, and if a bore must take an insert, give it a one-sided tolerance such as +1/−0.

What is the largest part you can make?

Extruded tubes up to 17×10 mm (OD × ID) and slip-cast tubes up to 100×90×1000 mm (OD × ID × length). Send the drawing for a larger part and we check it.

Can we get samples before the order?

Yes. We usually send 5–10 samples for you to approve before the order runs.

About forty short, thick ceramic rings with stepped bores scattered on a wooden table.

Custom alumina and industrial ceramic components

Custom alumina ceramic parts made to your drawing or sample: tubes with one or many bores, threaded and perforated tubes, rings, bushings, rods and special shapes. The usual minimum is 100 pieces per part, with 5–10 samples for your approval before production, which takes about 25–30 days.

Request a quote

usual minimum order: 100 pcs; usual minimum order
usual sample quantity: 5–10 pcs; usual sample quantity
usual lead time: 25–30 days; usual lead time
forming methods: 4; forming methods

Custom parts we have made

A pile of cream stepped ceramic bushings with through bores; a hand holds one to show the counterbore in its larger end.

A bundle of thick-walled cream-to-peach tubes held end-on, each with a large central bore and a ring of small holes in the wall.

Two cream ceramic tubes on a black surface, each with a continuous helical groove along most of its length and a plain section at one end.

Bundles of long, solid ivory ceramic bars with a square cross-section, tied with yellow bands, square ends toward the camera, on a dark charcoal-grey background.

See all 10 photos

Close-up of a bunch of four-bore ceramic insulators whose ends are cut with two parallel slots, leaving three prongs with the bores visible, on a dark charcoal-grey background.

Four long ivory ceramic tubes standing side by side, each with one row of large round holes down its length, on a dark charcoal-grey background.

Several hundred short, thick white ceramic rings, each with one central hole, loose in a grey tray.

A heap of bright white ceramic parts on a dark charcoal-grey background: thick-walled tubes and bushings with central bores, half-discs and large thick rings; in front, a bushing with a coarse granular end face.

Four flat white ceramic discs, each with one centre hole, on a dark charcoal-grey background.

Assorted ceramic parts on a dark charcoal-grey background: a long rectangular boat, a flat block, a short rod, a thin U-shaped bracket, a grooved bar and a flanged tube with a pointed closed end.

Configurations

Round, elliptical and square tubes, open or one end closed
Single-, twin- and multi-bore tubes, and capillaries
Threaded, ribbed, perforated and slotted tubes
Solid rods, square bars and balls
Rings, washers, bushings and discs
Crucibles, boats and other shapes to drawing

Properties

High-temperature resistance
Corrosion resistance
Thermal-shock resistance
Mechanical strength
Electrical insulation
High-frequency performance

Ordering

Minimum order, non-standard parts: 100 pcs; Usually, per item made to your drawing or sample.
Samples for approval: 5–10 pcs; Usually sent for you to approve before the order runs.
Production lead time: 25–30 days; Usual production cycle for non-standard parts.
Standard sizes from stock: ~3⁠–⁠7 days; Stock covers most standard sizes. Small orders ship in about 3 days, bulk orders in about 7 days.

Typical terms. Quantities and dates for your order are confirmed in its quotation.

Secondary operations

Done in the factory after forming. Hole sizes and positions are confirmed from your drawing.

Cut to lengthTubes cut to the ordered length.
End slotsA slot across a closed tip, or slots cut into open tube and insulator ends.
Side holes and perforated tubesOne or two side holes, or a line of holes along the tube.
Closed ends with drilled holesOne-end-closed tubes drilled along their length.

Grade and material data

Alumina, corundum and other industrial ceramics. Our standard grade is C799 alumina, 99.5% Al₂O₃, and we supply 95% white alumina where a drawing names C 610. The material is agreed per part at quotation.

Full material data

Typical values by material class, Custom alumina and industrial ceramic components
Material class	Al₂O₃ %	Working temperature °C	Hardness, Mohs
High-alumina	>85	1300–1450	8
Corundum	99–99.5^*	1600–1800^*	8-9
Mullite	Data supplied with quotation
Steatite	Data supplied with quotation
Cordierite	Data supplied with quotation
Wollastonite	Data supplied with quotation
Chrome-corundum	Data supplied with quotation

* Stated per SKU: the grade and maximum temperature of each part are confirmed in its quotation.

Guides

Sizes, grades and tolerances in more detail.

Questions buyers ask

Can you make an alumina part to our drawing or sample?: Yes. We make parts to a drawing or a sample by slip casting, pressing, extrusion or hot pressing: tubes, rods, crucibles, boats and special shapes.
What is the minimum order for a custom part?: Usually 100 pieces per item for a part made to your drawing or sample.
How long does a custom part take?: Usually 25–30 days to produce. The date is confirmed in the quotation.
Which material are custom parts made in?: Our standard is C799 alumina, 99.5% Al₂O₃, and we also make 95% white alumina. The material for each part is agreed in the quotation.
What should the drawing show?: OD, ID and length with tolerances, the Al₂O₃ grade, the ends, the quantity, and any insert or wire that has to pass through. PDF, DWG, DXF, STEP, IGES, PNG and JPG files all work.
What tolerances do you quote?: We set them from your drawing. As a guide, on our protection tubes we quote OD and ID to ±0.5 mm for OD 6–12 mm, ±0.6 mm for OD 15–17 mm, ±0.7 mm for OD 20 mm and ±1.0 mm for OD 24 mm, and length to ±1 mm. Mark the dimensions that matter, and if a bore must take an insert, give it a one-sided tolerance such as +1/−0.
What is the largest part you can make?: Extruded tubes up to 17×10 mm (OD × ID) and slip-cast tubes up to 100×90×1000 mm (OD × ID × length). Send the drawing for a larger part and we check it.
Can we get samples before the order?: Yes. We usually send 5–10 samples for you to approve before the order runs.

What to send for a quote

01Drawing (PDF, DWG, DXF or STEP) or a physical sample
02Critical dimensions and tolerances
03Operating temperature, load and environment
04Preferred material or Al₂O₃ grade, if known
05Quantity and whether this is a prototype or a series

Next family:Alumina thermocouple protection tubes

Request a quote

Get a quotation for custom components.

Tell us the dimensions, grade and quantity. We confirm the grade, dimensions and tolerances in each quotation. Our yearly lab reports are available on request.

Request a quote sales@gyalumina.com