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Alumina (Al₂O₃) Crucibles

High-purity alumina (Al₂O₃) crucibles for sintering, melting and thermal analysis, and general high-temperature use up to 1600°C.

Alumina (Al₂O₃, corundum) crucibles are the most widely used ceramic crucible for general high-temperature work — ceramic sintering, ash determination, metal melting and thermal analysis (TGA/DSC). Scuvette supplies high-purity Al₂O₃ crucibles in custom sizes for laboratories and industry, with long-term service temperatures up to 1600°C.

Why Choose Alumina (Al₂O₃) Crucibles

  • Cost-effective, widely available high-temperature ceramic with long-term service up to 1600°C.
  • Stable in neutral, oxidizing and many acid-environment conditions.
  • Low contamination of high-purity melts; available at 95% / 99% / 99.7% purity.
  • Good dimensional stability and moderate thermal-shock resistance for repeated use.
  • Custom shapes and sizes; OEM / ODM supported.

Specifications

MaterialAlumina (Al₂O₃), high-purity
Max service temperatureUp to 1600°C (long-term service; confirm atmosphere limits with our team)
Typical purity99%
ShapeCylindrical
LidWithout lid as standard; threaded-lid options available for selected sizes
CustomizationOEM / ODM, custom sizes available

Square / Rectangular Alumina Crucibles (49 Stock Sizes)

Scuvette supplies 99% alumina (Al₂O₃) square & rectangular crucibles in 49 stock sizes, each available open top (no lid), with lid (inner convex lid; flat lid for the 65×65× series), or as a single lid. High-purity corundum, rated up to 1600°C. See the dedicated page Square Alumina Crucibles.

45×8×6 mm
Wall 1.5 mm · 0.9 ml · Inner Convex Lid
No Lid US$2.40
With Lid US$4.00
Lid Only US$1.60
20×20×10 mm
Wall 2 mm · 2 ml · Inner Convex Lid
No Lid US$2.00
With Lid US$3.00
Lid Only US$1.00
20×20×17 mm
Wall 2 mm · 2 ml · Inner Convex Lid
No Lid US$2.00
With Lid US$3.00
Lid Only US$1.00
30×20×10 mm
Wall 3 mm · 2 ml · Inner Convex Lid
No Lid US$2.40
With Lid US$4.00
Lid Only US$1.60
50×10×10 mm
Wall 2 mm · 2 ml · Inner Convex Lid
No Lid US$2.90
With Lid US$4.20
Lid Only US$1.30
22×22×14 mm
Wall 2 mm · 3 ml · Inner Convex Lid
No Lid US$2.20
With Lid US$3.50
Lid Only US$1.30
25×15×15 mm
Wall 2 mm · 3 ml · Inner Convex Lid
No Lid US$2.40
With Lid US$4.00
Lid Only US$1.60
30×30×10 mm
Wall 3 mm · 4 ml · Inner Convex Lid
No Lid US$2.40
With Lid US$4.00
Lid Only US$1.60
50×20×10 mm
Wall 3 mm · 4 ml · Inner Convex Lid
No Lid US$4.00
With Lid US$5.50
Lid Only US$1.50
50×25×10 mm
Wall 3 mm · 4 ml · Inner Convex Lid
No Lid US$4.20
With Lid US$6.00
Lid Only US$1.80
30×20×17 mm
Wall 3 mm · 4.5 ml · Inner Convex Lid
No Lid US$2.40
With Lid US$4.00
Lid Only US$1.60
50×20×15 mm
Wall 3 mm · 7 ml · Inner Convex Lid
No Lid US$4.20
With Lid US$6.00
Lid Only US$1.80
30×30×20 mm
Wall 3.5 mm · 8.5 ml · Inner Convex Lid
No Lid US$3.40
With Lid US$5.00
Lid Only US$1.60
60×30×10 mm
Wall 3 mm · 9 ml · Inner Convex Lid
No Lid US$5.70
With Lid US$8.60
Lid Only US$2.90
50×20×20 mm
Wall 3 mm · 10 ml · Inner Convex Lid
No Lid US$4.20
With Lid US$6.00
Lid Only US$1.80
50×40×10 mm
Wall 3 mm · 10 ml · Inner Convex Lid
No Lid US$4.30
With Lid US$7.00
Lid Only US$2.70
50×50×10 mm
Wall 4 mm · 10.5 ml · Inner Convex Lid
No Lid US$5.70
With Lid US$10.00
Lid Only US$4.30
40×30×20 mm
Wall 3 mm · 13 ml · Inner Convex Lid
No Lid US$4.50
With Lid US$6.50
Lid Only US$2.00
50×25×20 mm
Wall 3 mm · 14 ml · Inner Convex Lid
No Lid US$5.20
With Lid US$7.00
Lid Only US$1.80
30×30×30 mm
Wall 3 mm · 15 ml · Inner Convex Lid
No Lid US$4.10
With Lid US$5.70
Lid Only US$1.60
60×30×15 mm
Wall 3 mm · 15 ml · Inner Convex Lid
No Lid US$6.40
With Lid US$9.30
Lid Only US$2.90
40×30×25 mm
Wall 3 mm · 17 ml · Inner Convex Lid
No Lid US$5.40
With Lid US$7.80
Lid Only US$2.40
50×40×15 mm
Wall 3 mm · 17 ml · Inner Convex Lid
No Lid US$4.80
With Lid US$7.50
Lid Only US$2.70
40×40×20 mm
Wall 3 mm · 18 ml · Inner Convex Lid
No Lid US$5.40
With Lid US$7.80
Lid Only US$2.40
50×25×25 mm
Wall 3 mm · 18 ml · Inner Convex Lid
No Lid US$6.70
With Lid US$8.50
Lid Only US$1.80
60×30×20 mm
Wall 3 mm · 20 ml · Inner Convex Lid
No Lid US$7.10
With Lid US$10.00
Lid Only US$2.90
40×30×30 mm
Wall 3 mm · 22 ml · Inner Convex Lid
No Lid US$6.20
With Lid US$8.60
Lid Only US$2.40
50×25×35 mm
Wall 3 mm · 25 ml · Inner Convex Lid
No Lid US$7.40
With Lid US$9.20
Lid Only US$1.80
50×40×20 mm
Wall 3 mm · 25 ml · Inner Convex Lid
No Lid US$5.80
With Lid US$8.50
Lid Only US$2.70
60×30×25 mm
Wall 3 mm · 28 ml · Inner Convex Lid
No Lid US$7.80
With Lid US$10.70
Lid Only US$2.90
40×40×30 mm
Wall 3 mm · 30 ml · Inner Convex Lid
No Lid US$8.00
With Lid US$10.50
Lid Only US$2.50
50×50×20 mm
Wall 3.5 mm · 30 ml · Inner Convex Lid
No Lid US$8.50
With Lid US$12.80
Lid Only US$4.30
60×40×20 mm
Wall 3 mm · 30 ml · Inner Convex Lid
No Lid US$9.30
With Lid US$12.90
Lid Only US$3.60
60×30×30 mm
Wall 3 mm · 35 ml · Inner Convex Lid
No Lid US$8.50
With Lid US$11.40
Lid Only US$2.90
50×50×25 mm
Wall 3.5 mm · 39 ml · Inner Convex Lid
No Lid US$10.00
With Lid US$14.30
Lid Only US$4.30
70×70×15 mm
Wall 4.5 mm · 39 ml · Inner Convex Lid
No Lid US$14.30
With Lid US$22.10
Lid Only US$7.80
40×40×40 mm
Wall 3 mm · 40 ml · Inner Convex Lid
No Lid US$9.60
With Lid US$12.00
Lid Only US$2.40
60×60×20 mm
Wall 4.5 mm · 40 ml · Inner Convex Lid
No Lid US$12.90
With Lid US$19.20
Lid Only US$6.30
60×60×25 mm
Wall 4.5 mm · 40 ml · Inner Convex Lid
No Lid US$18.00
With Lid US$24.30
Lid Only US$6.30
50×50×30 mm
Wall 3.5 mm · 45 ml · Inner Convex Lid
No Lid US$13.50
With Lid US$17.80
Lid Only US$4.30
60×60×30 mm
Wall 4.5 mm · 65 ml · Inner Convex Lid
No Lid US$18.00
With Lid US$24.30
Lid Only US$6.30
65×65×25 mm
Wall 4.5 mm · 65 ml · Flat Lid
No Lid US$21.40
With Lid US$31.40
Lid Only US$10.00
65×65×30 mm
Wall 4.5 mm · 80 ml · Flat Lid
No Lid US$22.90
With Lid US$32.90
Lid Only US$10.00
60×60×30 mm
Wall 4.5 mm · 90 ml · Inner Convex Lid
No Lid US$18.70
With Lid US$25.00
Lid Only US$6.30
65×65×35 mm
Wall 4.5 mm · 95 ml · Flat Lid
No Lid US$25.00
With Lid US$35.00
Lid Only US$10.00
70×70×30 mm
Wall 4 mm · 100 ml · Inner Convex Lid
No Lid US$20.10
With Lid US$27.90
Lid Only US$7.80
60×60×50 mm
Wall 4.5 mm · 110 ml · Inner Convex Lid
No Lid US$21.60
With Lid US$27.90
Lid Only US$6.30
70×70×45 mm
Wall 4 mm · 150 ml · Inner Convex Lid
No Lid US$30.10
With Lid US$37.90
Lid Only US$7.80
65×65×65 mm
Wall 4 mm · 190 ml · Flat Lid
No Lid US$35.00
With Lid US$45.00
Lid Only US$10.00

Cylindrical Alumina Crucibles (18 Stock Sizes)

Scuvette supplies 99% alumina (Al₂O₃) cylindrical crucibles in 18 stock sizes, each available open top (no lid) or with lid (inner convex lid). High-purity corundum, rated up to 1600°C. See the dedicated page Cylindrical Alumina Crucibles.

Browse Cylindrical Alumina Crucibles

Applications

  • Ceramic and powder sintering, calcination and firing.
  • Ash determination and loss-on-ignition (LOI) testing.
  • Melting non-ferrous and some reactive metals (e.g. aluminium).
  • TGA / DSC and other thermal analysis; sample containment.

Handling & Thermal Notes

  • Pre-heat gradually to avoid thermal shock.
  • Avoid strongly alkaline melts, molten alkali carbonates and fluoride fluxes — alumina reacts with these.
  • Store dry; ceramic can absorb moisture over time.
  • Confirm rated temperature and atmosphere limits with our technical team before use.

Frequently Asked Questions

What is alumina (Al₂O₃) used for in crucibles?

Alumina crucibles are the standard general-purpose ceramic crucible for high-temperature work — sintering, ash testing, metal melting and thermal analysis (TGA/DSC) where stable, low-contamination containment up to 1600°C is required.

Can alumina crucibles be used for TGA / DSC?

Yes — high-purity alumina is a common crucible material for TGA/DSC and ashing because of its thermal stability and low background up to ~1600°C.

Which melts react with alumina crucibles?

Alumina can react with strong alkaline melts, molten alkali carbonates and fluoride fluxes. For strongly alkaline or reactive melts, MgO or zirconia is preferred. Confirm chemical compatibility for your specific melt with our team before use.

Request a Quote or Custom Size

Need a specific grade, capacity or shape? Contact [email protected] for lead time, customization and pricing. OEM / ODM supported. Worldwide shipping.

Inquiry Now

Related Crucibles

Related Guides

Typical Applications of Alumina (Al₂O₃) Crucibles

See how alumina compares with zirconia, magnesia and yttria in one table: Compare all four crucible materials →

Why Buy Crucibles From Scuvette

ISO 9001:2015
Certified quality system (NOA2408337)
RoHS Compliant
SGS report TAOEC26010238501
Manufacturer-Direct
Made by WUXI AORUITUO since 2010
Custom & OEM
Made to drawing, any size & shape
Fast Prototyping
Samples in 1–3 days; bulk 10–20 days

Crucible Material Quick-Compare

PropertyAlumina (Al₂O₃)Magnesia (MgO)Zirconia (ZrO₂)
Max service temperatureUp to 1600 °CUp to 2200 °CUp to 2300 °C (inert / reducing)
Typical purity99% (95–99.7% available)99%99% (calcia-stabilized)
Best for alkaline meltsPoor — reacts with strong alkalisExcellentGood (resists wetting by metals)
Thermal-shock resistanceModerateLower — heat slowlyGood (best of the three)
Relative costLowestHigherHighest

Not sure which material fits your melt? Read our Crucible Material Guide or Crucible Temperature Guide for a full selection walkthrough.

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Alumina Crucibles — Frequently Asked Questions

What is alumina (Al₂O₃) used for in crucibles?

Alumina crucibles are the standard general-purpose ceramic crucible for high-temperature work — sintering, ash testing, metal melting and thermal analysis (TGA/DSC) where stable, low-contamination containment up to 1600°C is required.

Alumina vs MgO — which crucible for alkaline melts?

For strongly alkaline or alkaline-earth melts and fluoride fluxes, MgO or zirconia is preferred because alumina reacts with strong alkali. Alumina is the better general choice for neutral, oxidizing and many acid-environment high-temperature work up to 1600°C.

Which melts react with alumina crucibles?

Alumina can react with strong alkaline melts, molten alkali carbonates and fluoride fluxes. For strongly alkaline or reactive melts, MgO or zirconia is preferred. Confirm chemical compatibility for your specific melt with our team before use.

What is the maximum safe operating temperature of an alumina crucible?

A 95–99% alumina (Al₂O₃) crucible is typically usable up to about 1600 °C in air and somewhat higher in inert or reducing atmospheres. The exact limit depends on purity, wall thickness and your process atmosphere — confirm with our team for your specific application.

Can alumina crucibles be used for acidic or oxidizing melts?

Yes. Alumina is stable in most oxidizing atmospheres and many acid environments, which is why it is the preferred general-purpose ceramic for such high-temperature work. It is attacked by strong alkalis, molten alkali carbonates and fluoride fluxes — for those, choose MgO, zirconia or yttria instead. See the four-material comparison table for a side-by-side view.

Other Crucible Materials