High-purity magnesia (MgO) crucibles for reactive-metal, alkaline and high-temperature melts up to 2200 °C.
115 stock sizes in cylindrical and square/rectangular forms, with or without cap. Custom sizes and OEM on request.
Why MgO Crucibles?
Alkaline-resistant — stable against basic and many reactive-metal melts that attack alumina or zirconia
High temperature — long-term service up to 2200 °C
High-purity MgO bodies — 99% MgO for standard sizes; large-format bodies are 95% MgO stabilised with yttria and zirconia
Open-top & capped — open-top sold per piece, capped sets sold per set
Custom shapes — OEM / ODM, custom dimensions and markings available
Material: 95–99% MgOMax temp: 2200 °COpen-top: per pieceCapped: per set
Common Specifications
Material
95–99% Magnesium oxide (MgO)
Max Service Temperature
2200 °C
Shapes
Cylindrical, Square, Rectangular
Wall Thickness
0.65 – 7.5 mm (size dependent)
Capacity
85 µL – 1.9 L
Customization
OEM / ODM, custom sizes
Stock Sizes & Prices
All 115 stock sizes listed below. Filter by shape, lid type or part number, sort any column, and add to cart directly.
Handling precautions:Magnesia crucibles need controlled heating and are not suitable for vacuum sintering or corrosive environments. Read the care guide →
No sizes match your filters. Contact us for custom dimensions.
Cylindrical Crucibles — With Lid
OD / L×W (mm)
Height (mm)
Wall (mm)
Weight (g)
Capacity
Shape
Lid
Part No.
Price
Action
No sizes match your filters. Contact us for custom dimensions.
Square / Rectangular Crucibles — Open Top (No Lid)
OD / L×W (mm)
Height (mm)
Wall (mm)
Weight (g)
Capacity
Shape
Lid
Part No.
Price
Action
No sizes match your filters. Contact us for custom dimensions.
Square / Rectangular Crucibles — With Lid
OD / L×W (mm)
Height (mm)
Wall (mm)
Weight (g)
Capacity
Shape
Lid
Part No.
Price
Action
No sizes match your filters. Contact us for custom dimensions.
Custom & OEM Magnesium Oxide Crucibles
Need a magnesium oxide crucible in a size outside our 115 stock formats? We manufacture custom MgO crucibles and boats to your drawing — non-standard diameters, heights, wall thicknesses, tapered or lidded designs. Typical lead time is 2–3 weeks with an MOQ from 50 pieces. Send your drawing or dimensions to [email protected] for a quote.
Typical Applications of Magnesia (MgO) Crucibles
Reactive & alkaline metals containment and melting of magnesium, lithium and alkaline-earth alloys, and alkaline fluxes where alumina would be attacked.
Molten salts & fluxes carbonate and hydroxide melts, and basic flux processes that require resistance to alkaline attack.
Thermal analysis & ashing combustion, TGA and ashing of alkaline or strongly basic samples up to ~2200 °C in air.
Oxide crystal growth single-crystal growth in strongly basic environments where alternative oxides dissolve.
Yes. We manufacture custom MgO crucibles and boats from your drawing or specs — diameter, height, wall thickness, with or without lid. MOQ from 50 pieces, lead time ~2–3 weeks. Email [email protected] for a quote.
What temperature can magnesium oxide crucibles withstand?
MgO crucibles are stable up to 2200 °C in air, ideal for reactive metals, alkaline fluxes and molten salts.
Are MgO crucibles chemically compatible with molten metals?
Magnesia resists alkaline melts and many metal oxides, but is attacked by acids and strong fluxes containing borates or phosphates. Contact us for a compatibility check.
How does magnesia compare to alumina and zirconia crucibles?
Magnesia resists alkaline and basic melts better than alumina and tolerates slightly higher temperatures, but is attacked by acids. Zirconia withstands higher temperatures and resists both acids and alkalis, at higher cost. See the four-material comparison table for a side-by-side view.
Can magnesium oxide crucibles be used with water or in humid conditions?
MgO can slowly hydrate on contact with liquid water or prolonged high humidity, forming brucite (Mg(OH)₂). Keep crucibles dry and avoid aqueous or steam-rich processes; pre-dry before high-temperature use.
What is the MgO purity of your crucibles?
Standard sizes use a high-purity 99% MgO body. Large-format and heavy-wall crucibles (such as our 700 mL class) use a 95% MgO body stabilised with yttria (Y2O3) and zirconia (ZrO2), which lets a large crucible be fired dense and low in porosity. Tell us the size you need and we will confirm the exact body together with its composition and physical-property data sheet.
