Category · Alumina Crucibles

Square Alumina (Al₂O₃) Crucibles

Q: What temperature and atmosphere can 99% alumina crucibles handle?

Our 99% Al2O3 crucibles are rated for long-term service up to 1600 °C in neutral and oxidising atmospheres. Avoid rapid thermal shock and contact with strong alkalis at high temperature, which attack alumina.

High-purity 99% alumina (Al₂O₃) crucibles for calcination, ashing, sintering and general high-temperature work up to 1600 °C. 115 stock sizes in square and rectangular forms, with or without lid. Custom sizes and OEM on request.

Why Alumina (Al₃O₃) Crucibles?

High-purity Al₃O₃ — 99% aluminium oxide bodies for clean, low-contamination containment of most samples
Up to 1600 °C — rated for long-term service in neutral and oxidising atmospheres
Space-efficient shape — square and rectangular footprints sit flat on furnace trays and pack tightly for batch work
Open-top & lidded — open-top sold per piece, lidded sets sold per set
Custom shapes — OEM / ODM, custom dimensions, wall thickness and laser markings available

Material: 99% Al₃O₃ Max temp: 1600 °C Open-top: per piece Capped: per set

Common Specifications

Material

99% Aluminium oxide (Al₃O₃)

Max Service Temperature

1600 °C

Shapes

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:Alumina crucibles are suitable for neutral and oxidizing atmospheres up to 1600°C. Avoid rapid thermal shock and contact with strong alkalis at high temperature. Alumina Crucibles →

Square / Rect. · Open Top Square / Rect. · With Lid

Square / Rectangular Crucibles — Open Top (No Lid)

L×W (mm)	Height (mm)	Wall (mm)	Weight (g)	Capacity	Shape	Lid	Part No.	Price	Action

Square / Rectangular Crucibles — With Lid

L×W (mm)	Height (mm)	Wall (mm)	Weight (g)	Capacity	Shape	Lid	Part No.	Price	Action

Manufacturer & Quality Assurance

Scuvette has manufactured high-purity laboratory ceramics and quartz optics since 2010. Crucibles are produced under an ISO 9001:2015 quality management system (Certificate NOA2408337) and are RoHS compliant (SGS report TAOEC26010238501). No minimum order quantity; custom sizes and OEM service are available.

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Square Alumina Crucibles — Frequently Asked Questions

What are square alumina crucibles used for compared with cylindrical ones?

Square and rectangular alumina crucibles make better use of furnace-tray and hot-plate space and sit flat without rolling, so they are preferred for batch ashing, powder sintering and TGA/DSC sample arrays where many containers share one tray. Cylindrical crucibles are easier to pour from and are the default for single-sample melts.

Do the square crucibles come with lids, and when should I use a lid?

Both open-top and lidded versions are stocked. A lid reduces melt evaporation and contamination during long high-temperature holds, which matters for volatile salts and moisture-sensitive samples; open-top crucibles are simpler to load, scrape and clean. Lidded sets are sold per set, open-top pieces singly.

What temperature and atmosphere can 99% alumina crucibles handle?

Our 99% Al₃O₃ crucibles are rated for long-term service up to 1600 °C in neutral and oxidising atmospheres. Avoid rapid thermal shock and contact with strong alkalis at high temperature, which attack alumina.

How do I read the stock-size dimensions (L × W × H)?

Dimensions are given as outer length × width × height in millimetres, with wall thickness and capacity listed per row. Choose the height for your fill volume (leave headspace for expansion) and the footprint for your tray layout.

Can I order custom square or rectangular sizes, and what is the lead time?

Yes — custom outer dimensions, wall thickness, lids and laser markings are available (OEM/ODM). Stocked sizes ship within 1–3 business days of payment; custom square and rectangular crucibles are cut to drawing in roughly 10–20 days before dispatch.