High Temperature Alumina Crucibles (Al2O3) Customized for Labs and Melting
ADCERAX is a leading alumina crucible manufacturer and supplier from China, providing advanced alumina ceramic crucible solutions. We supply alumina ceramic crucibles with cylindrical/rectangular forms, high-form/low-form, stepped or vented lids. Tolerance up to ±0.1mm; grades 96%/99%/99.5%/99.7%, making them ideal for high-temperature sintering, precise thermal analysis, and essential melting processes. Partner with us for high quality and tailored solutions.
Are you seeking alumina crucibles for high temperature applications? Contact us today for a personalized quote or to discuss your specific requirements!
1730°C
Max Operating Temp
（99.7% Purity）
with Lids available
Tolerance and
Small Batch custom
direct pricing
What is Alumina Crucible?
Define Alumina Crucible
An alumina crucible (also called an Al2O3 crucible) is a high-temperature ceramic vessel used to hold solids or melts during calcination, sintering, and small-batch melting in laboratories and industrial furnaces. Thanks to its high alumina content and dense microstructure, it offers chemical inertness, excellent electrical insulation, and stable geometry across repeated thermal cycles.
Superior wear resistance for demanding applications
Operates reliably up to 1750°C
Outstanding dielectric properties
Inert to acids, alkalis, and corrosive media
Alumina Crucible Composition
An alumina ceramic crucible is manufactured from high-purity α-alumina with tightly controlled trace oxides and process aids. The goal of this composition is consistent densification, low contamination risk, and stable geometry under thermal cycling.
| Grade | Al₂O₃ (typ.) | SiO₂ (max) | Na₂O (max) | Fe₂O₃ (max) | MgO (max)* | CaO (max)* | Others (each, max) |
|---|---|---|---|---|---|---|---|
| 96% Al₂O₃ | ≥ 96.0% | ≤ 2.50% | ≤ 0.30% | ≤ 0.15% | ≤ 0.50% | ≤ 0.50% | ≤ 0.50% |
| 99% Al₂O₃ | ≥ 99.0% | ≤ 0.50% | ≤ 0.20% | ≤ 0.05% | ≤ 0.10% | ≤ 0.10% | ≤ 0.10% |
| 99.5% Al₂O₃ | ≥ 99.5% | ≤ 0.20% | ≤ 0.10% | ≤ 0.05% | ≤ 0.05% | ≤ 0.05% | ≤ 0.05% |
| 99.7% Al₂O₃ | ≥ 99.7% | ≤ 0.15% | ≤ 0.05% | ≤ 0.03% | ≤ 0.03% | ≤ 0.03% | ≤ 0.03% |
| 99.9% Al₂O₃ | ≥ 99.9% | ≤ 0.03% | ≤ 0.02% | ≤ 0.01% | ≤ 0.02% | ≤ 0.02% | ≤ 0.01% |
*MgO/CaO may appear at trace levels from raw materials or as grain-growth/densification modifiers.
Alumina Crucible Materials
🧪Core Material (finished body)
- α-Al₂O₃ microstructure with low open porosity for clean surfaces and predictable cycles.
- Grade choices: 96%, 99%, 99.5%, 99.7%, 99.9% (COA available).
Working guidance: typical alumina crucible maximum temperature is 1450–1800 °C in air or inert gases; the melting point of alumina crucible is ~2050 °C (material reference).
🧪Lids & Seating
- Same Al₂O₃ composition as the body to keep fit and expansion consistent.
- Stepped lids and flanged rims reduce drafts; choose alumina crucible with lid for TGA/DSC or volatile runs.
🧪Coatings & Contact Policy
- Interior unglazed by default to avoid silica-rich films.
Optional exterior seal coats on request; specified so they do not contact the charge.
Alumina Crucible Making
Step1:Raw Material Preparation
- Powder Processing
- Mixing and Granulation
Step2:Forming
- Dry Forming
- Wet Forming
- 3D Printing
Step3:Sintering
- Binder Burnout
- High-Temperature Sintering
Step4:Post-processing and Finishing
- Precision Machining
- Surface Treatment
Route Selector for reference
| Forming route | Best for | Typical capacity | Tolerance after finish | Notes |
|---|---|---|---|---|
| CIP + finish machining | Cylindrical cups, uniform walls | 5–1000 ml | ±0.1–0.2 mm | High repeatability; economical from small batches |
| Slip casting | Rectangular / high-form, thin walls | 50–500 ml | ±0.2–0.3 mm | Smooth surfaces; good for complex lids |
| Tool pressing / injection | Volume runs, repeat SKUs | 5–200 ml | ±0.2 mm | Lower unit cost when quantities are high |
Alumina Crucible Sizes
ADCERAX supplies alumina crucibles from 5 ml to 1000 ml in cylindrical, rectangular forms and other shapes, with optional lids and drawing-based machining.
| Capacity (nominal) | Cylindrical ID × Height (mm) | Rectangular L × W × H (mm) | Lid Option | Notes |
|---|---|---|---|---|
| 5 ml | Ø 18–22 × 15–20 | 16–20 × 12–16 × 12–16 | Flat / stepped | Micro samples; fast heat-up |
| 50 ml | Ø 35–40 × 32–40 | 36–42 × 26–32 × 24–30 | Flat / stepped | Routine calcination |
| 100 ml | Ø 50–55 × 45–55 | 52–58 × 36–42 × 34–42 | Flat / stepped | Common lab size |
| 250 ml | Ø 70–78 × 70–85 | 75–85 × 55–65 × 50–65 | Flat / stepped | Pilot batches |
| 500 ml | Ø 85–95 × 90–110 | 95–110 × 70–85 × 65–85 | Flat / stepped | Small-batch melts |
| 1000 ml | Ø 110–125 × 120–150 | 125–145 × 95–115 × 90–115 | Flat / stepped | Scale-up trials |
Alumina Crucible Properties & Benefits
- 🧩 Tight geometry for process control
An alumina ceramic crucible machined to ±0.1 mm keeps wall thickness and curvature consistent, delivering predictable heat profiles and repeatable mass balances. - 🧪 Lid/flange ecosystem for atmosphere stability
An al2o3 crucible with lid builds a calm boundary layer that reduces drafts, vapor loss, and powder lift—ideal for TGA/DSC and inert-gas workflows. - 📐 Form factor tunes evaporation and throughput
High-form vs. low-form adjusts surface exposure; cylindrical aids even flow and handling, while rectangular packs tighter in a fixed furnace to raise per-cycle yield. - 🚀 Scale-up and workflow efficiency by design
Geometrically consistent Al2O3 crucible series (5–1000 ml) enables bench-to-pilot scaling without re-qualifying interfaces; spouts/pointed bottoms, racks, and paired IDs speed clean transfer and traceable repeats.
| Property | 96% Al₂O₃ | 99% Al₂O₃ | 99.7% Al₂O₃ |
|---|---|---|---|
| Density (g/cm³) | 3.6–3.75 | 3.80–3.90 | ≥3.93 |
| Flexural Strength (MPa) | 260 | 300 | 330 |
| Hardness (Mohs) | 8.8 | 9.0 | 9.1 |
| Thermal Conductivity (W/m·K) | 22 | 24 | 29 |
| Melting Point (°C) | ≈2050 | ≈2050 | ≈2050 |
| Max Operating Temp (°C) | 1450 | 1680 | 1730 |
| Safety Temperature Range | RT–1500 | RT–1600 | RT–1700 |
Have specific requirements? Our engineers are ready to help
Types of Alumina Crucible
Alumina ceramic crucibles can be produced in various shapes, including cylindrical, rectangular, conical alumina crucible with lid and other shapes. We also custom-machined geometries according to your drawings.
round bottomed boat alumina crucible
For analyzing liquids and melting samples, it maximizes surface area for uniform heating and prevents spillage.
Rectangular Alumina Crucible
Rectangular alumina crucible providing dense geometry for predictable temperature distribution and improved DoE repeatability in lab and pilot furnaces.
Cylindrical alumina crucible
Alumina cylindrical crucible providing uniform wall geometry for stable temperature fields and repeatable results in lab and pilot furnaces.
Conical alumina crucible
Tapered alumina crucible provides tapered walls that drive condensate and solids downward, reducing wall deposits and improving recovery in small-batch melts.
Pointed bottom alumina crucible
Pointy alumina crucibles concentrates residues at the tip, enabling low-volume rinsing and higher recovery for trace ICP/ICP-MS workflows.
Alumina crucible with lid / cover
Alumina crucible with cover reduces vapor loss and splatter, improving mass-balance accuracy and sample recovery.
Trapezoid Alumina Crucible
Trapezoid alumina crucible reduces “cold corners” versus rectangles, supporting more uniform exposure and repeatable results.
Alumina Crucible with Spout
Alumina crucible with spout allows decanting while solids settle, preserving pellets or crystals and improving product recovery.
TGA alumina crucible
Alumina tga crucibles ensure accurate compositional analysis by preventing catalytic reactions that can interfere with mass change measurements.
DSC Alumina Crucible
Alumina crucible dsc offer the most cost-effective solution for high-temperature thermal analysis of inorganic materials, providing excellent performance.
Find High Quality Alumina Crucibles to Elevate Your Research & Industrial Processes?
Factory-direct Al2O3 crucibles from 5–1000 ml, cylindrical or rectangular, optional lids, and machining up to ±0.1 mm. Get a firm price & lead time within 24 hours.
Alumina Crucible Applications & Uses
As an alumina ceramic crucible factory and wholesaler based in China, ADCERAX supplies alumina ceramic crucible solutions for thermal analysis, high-temperature alloys, and advanced sintering. The design minimizes contamination and thermal degradation, ensuring dependable outcomes and superior process stability.
🧪Chemical & Laboratory
Routine calcination, catalyst preparation/activation, ash tests, drying and weighing sequences using a laboratory alumina ceramic crucible.
Typical setup: Low-form for fast cycles; high-form when splash or draft control matters; rectangular sets for parallel DoE; lids as needed.
Common challenges: Transit breakage (reported 2–5 pcs per batch with generic packing); inconsistent mass balance due to drafts; need for small MOQ and quick replenishment.
ADCERAX solution: Foam-in-box cell trays + drop-tested cartons; optional replacements for DOA units; stepped lids that stabilize airflow; stock programs with 24-hour dispatch and clear MOQ.
🔥Metallurgy & Casting
Industrial alumina crucibles for small-batch melting, pour trials, slag studies, and clean sample splits before analysis.
Typical setup: High-form bodies for splash control; alumina crucibles with spout or pointed bottom for accurate decanting; optional lids to moderate drafts/oxidation.
Common challenges: Edge drips and wall wetting; oxidation during holds; rim chipping and inconsistent pours.
ADCERAX solution: Spouted/pointed designs that reduce carryover and lower rinse volume; matched lids for calmer headspace; chamfered rims and robust packing to cut handling damage and keep yield consistent.
🔬Materials Science & R&D
Calcination and high-temperature sintering of ceramics/composites; small-batch melts and frits; thermal studies using a TGA alumina crucible or DSC alumina crucibles.
Typical setup: Cylindrical or rectangular alumina crucible, high-form when reducing surface exposure; optional stepped lids; capacities 5–1000 ml; seat tolerance ±0.1–0.2 mm.
Common challenges: Baseline drift and powder lift in TGA/DSC; fit mismatch between cup and lid; slow turnaround for atypical sizes.
ADCERAX solution:Smooth rims + stepped lids for stable baselines; precise seating to ±0.1–0.2 mm eliminates rework (a U.S. lab cut rework previously at 13%); stock ships in 24 h, custom quoted in 24 h with clear lead times.
🧱 Semiconductor Materials
Precursor calcination, target pre-sintering, doped-glass mixes, gettering media activation; clean decanting for ICP sampling.
Typical setup: High-form Al2O3 crucibles with lids for controlled headspace; spouted or pointed-bottom designs for trace recovery; paired tare-mass labels for QA.
Common challenges:Trace contamination (Na/Si pickup), volatile dopants, and long waits for tight-tolerance parts.
ADCERAX solution: High-purity grades with COA; geometry that protects volatiles (high-form + lid); precise machining for repeatable seating; expedited quoting and production (a German materials group avoided 8-week delays by switching to our build plan).
China Alumina Crucibles Customized supplier
We specialize in custom alumina ceramic crucibles with special sizes, tight tolerances, and complex features. OEM and small-batch support available.
Customization Options
Extra-large / Extra-small diameters, non-standard thicknesses, and ultra-long / ultra-short lengths.
Provide higher - level dimensional accuracy and concentricity control than the standard.
Flanges, steps, threads, drilling holes, grooves, etc.
Adjust the material according to the application requirements.
Polish and grind the surface to achieve a specific surface roughness.
Customization Process
Send us your drawing, CAD file, or physical sample with material grade, dimensions, tolerances, and quantity. Our engineers will evaluate the design and provide a detailed quotation with lead time and pricing.
Once the quote is approved, we proceed with sample prototyping (1–50 pcs) if needed, for testing and validation.
After sample approval or direct confirmation, we begin batch manufacturing using CNC machining, sintering, and polishing. All parts undergo dimensional checks, material purity testing, and surface finish inspection.
Finished products are securely packed and shipped via DHL/FedEx/UPS or your preferred method. We support global delivery with full documentation.
Why Choose ADCERAX as Your Alumina Ceramic Crucible Manufacturer?
ADCERAX is a focused producer and trusted supplier of alumina crucibles, committed to reliability, fast lead times, and clear technical guidance so you can source the right Al2O3 crucible with confidence.
Competitive pricing with strict quality control from raw material sourcing to final delivery
Professional team providing comprehensive technical support and collaborative design
Small batch orders to large-scale production with complex geometries and tight tolerances
24-hour response and 24-hour dispatch for standard items, 3-7 weeks for custom orders.
Alumina(Al2O3)Crucible Factory-ADCERAX
ADCERAX is a professional China crucible alumina manufacturer and wholesaler that offers high-performance components with tight tolerances (±0.1mm) and custom geometries. Using advanced forming methods and CNC machining, we deliver precision-engineered solutions for electronics, chemical, and high-temperature applications.
- 99.7% high-purity alumina for stable performance
- Custom parts based on your drawings or samples
- Fast prototyping (7–15 days) & flexible MOQ
- ISO-compliant quality control & inspection reports
- Direct engineering support from design to delivery
This table highlights our core technical strengths, including material options, tight tolerances, and advanced manufacturing methods. We offer tailored solutions to meet diverse industrial requirements.
| Technical Capabilities Overview | |
|---|---|
| Material Grades | 96%, 99%, 99.5%, 99.7% Al₂O₃ – high purity for demanding applications |
| Tolerances | Up to ±0.1mm – suitable for precision assemblies |
| Forming Methods | Dry pressing, isostatic pressing, extrusion, casting, injection molding |
| Processing | CNC machining, fine grinding, polishing |
| Surface Finish | Polished / Unglazed / Glazed |
| Customization | Drawings, CAD files, or samples accepted for custom parts |
Alumina Ceramic Crucible Quality & Certifications
FAQ
Yes. ADCERAX supplies standard sizes in stock (5–1000 ml) and lists alumina ceramic crucibles for sale with optional lids; custom drawings are quoted within 24 hours. Contact us to get a price!
Our alumina crucibles can withstand temperatures up to 1800°C (99.9 alumina crucible ), making them suitable for a wide range of high-temperature applications.
Size, grade, tolerance (±0.2 mm vs. ±0.1 mm), and lid/packaging drive alumina crucible cost. For a line-item alumina crucibles price sheet, request our current quotation.
Our standard al2o3 crucibles are available in purities of ≥96% and ≥99.7%. Higher purities, up to 99.9% Al2O3, are available upon request for highly sensitive applications.
Yes, we specialize in custom alumina crucibles. We can manufacture crucibles to your exact specifications, including unique sizes, shapes (e.g., U-shaped alumina boat crucible), and wall thicknesses. Please provide your drawings or samples for a precise quote.
Yes. ADCERAX is a China-based manufacturer and supplier—we supply china alumina ceramic crucible worldwide. We offer efficient international shipping with fast dispatch for stock (24–72 h), express/air options for urgent or standard deliveries, door-to-door service, and end-to-end tracking.
A: We implement a rigorous quality control system, from raw material inspection to final product testing. Our processes ensure consistent batch quality and reliable performance for every alumina ceramic crucible.
Start clean: Let the cup cool, brush off loose powder, and do a quick soak in warm DI water with a neutral, non-ionic detergent. Rinse to ~pH 7.
Preferred chelation (first choice): Soak in 5–10% citric or ~5% oxalic for 15–30 min. Swab gently with lint-free applicators → DI rinse ×3 → oven-dry 110–150 °C (30–60 min).
Stubborn Fe stains (fallback): Short soak in 3–5% HCl for ≤10 min, then immediate DI rinse ×3 and dry as above.
Good practice: Record tare mass before/after cleaning; avoid steel tools that can re-deposit iron; keep contact times short to preserve rim/seat geometry.
Do / Don’t:
1. ✅ Use dilute acids only; use PPE and proper ventilation; dispose of waste per site rules.
2.❌ No HF and no strong alkali (etch/roughen Al₂O₃). ❌ Avoid abrasive pads on the interior.
3.TGA/DSC micro-cups: Use very short dilute soaks and re-verify the instrument baseline after cleaning.
Routine clean (start here): Let the cup cool to room temperature. Brush off loose powder, then soak 15–30 min in warm DI water with a neutral, non-ionic detergent. Wipe with lint-free swabs, rinse with DI water until neutral (2–3×), and oven-dry at 110–150 °C for 30–60 min.
If residues remain (acid-assist): Use only dilute acids—5–10% HNO₃ or 3–5% HCl (or 5–10% citric/acetic for gentler chelation). Soak 10–20 min, swab gently, rinse DI 3×, then dry at 110–150 °C.
Iron staining: Prefer 5–10% citric or 5% oxalic for 15–30 min; for stubborn stains use 5% HCl ≤10 min, then rinse DI 3× and dry.
Do / Don’t: Do use soft tools, DI water, neutral detergents, and controlled heating. Do label tare mass for QA. Don’t quench hot ware, don’t use HF or strong alkali (they etch alumina), and avoid abrasive pads or metal scrapers on the interior.
TGA/DSC micro-cups: Keep contact minimal (brush → DI rinse → low-temp dry). If acid is necessary, keep soaks very short and re-verify instrument baseline after cleaning.
We use optimized packaging to minimize damage. In the rare event of transit damage, please contact us immediately with photos, and we will arrange for replacement or compensation as per our policy.
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Ready to Partner with ADCERAX?
Whether you need a standard alumina crucible or a complex customized alumina crucible, our team is ready to assist. Get in touch today to discuss your requirements.
info@adcerax.com
+(86) 0731-74427743 | WhatsApp: +(86) 19311583352
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