Heat Resistant Alumina Al2O3 Ceramic Crucible for Lab Melting

Heat Resistant Alumina Al2O3 Ceramic Crucible for Lab Melting

Main Component:

High-purity α-phase alumina (Al₂O₃), available in 95%, 99%, 99.5% purity grades with minimal impurity residue.

Porosity:
Low open porosity ≤ 0.1% with high sintered density, excellent air tightness and no liquid leakage during high-temperature melting.

Temperature Rating:
Long-term stable service at 1600℃, short-term peak temperature resistance up to 1800℃ for intermittent heating cycles.

Melting Point:
Approx. 2050℃, featuring low thermal conductivity and excellent high-temperature structural stability.

Product Type:
Standard cylindrical, conical, arc-bottom models with optional matching lids; both in-stock standard sizes and full custom fabrication available.

Introduction

Product Details

1. Overview of Alumina Ceramic Crucible

1.1 Definition and Basic Features

Alumina ceramic crucible, also known as high-purity Al₂O₃ melting crucible, is a refractory lab vessel fabricated from fine α-phase alumina powder through isostatic pressing and high-temperature solid-state sintering. It is the most widely used standard high-temperature container in material research, chemical analysis and metallurgical laboratories, designed to withstand extreme thermal conditions while maintaining stable physical and chemical properties.
As a classic advanced ceramic product, it inherits the inherent hardness and thermal stability of alumina, and serves as a core consumable matching muffle furnaces, tube furnaces and box-type atmosphere furnaces.

1.2 Classification and Grade Standards

Based on alumina purity and sintering process, alumina crucibles are divided into three mainstream grades to match different working requirements.
95% alumina grade contains 95wt% Al₂O₃, with balanced cost and performance, suitable for routine sample ashing and medium-temperature powder calcination.
99% alumina grade has 99wt% Al₂O₃ content with extremely low impurity ratio, ideal for high-temperature metal melting and general structural ceramic sintering experiments.
99.5% high-purity grade adopts deep-purified raw materials and precision sintering process, complies with strict laboratory analytical material specifications, suitable for precision sample preparation and high-purity material research, with minimal contamination to test samples.

2. Core Characteristics of Alumina Ceramic Crucible

2.1 Physical Properties

The core physical advantage of high-quality alumina crucible is its high sintered density and ultra-low open porosity. After high-temperature sintering, the open porosity of standard 99% alumina crucible is ≤ 0.1%, with a compact internal structure that completely prevents liquid sample penetration and leakage.
It has high flexural strength and rigid framework, which maintains good dimensional stability under static load at high temperature, and will not deform or soften under normal working conditions. The finely polished inner wall has a smooth surface, which is easy to clean after use and supports repeated experimental cycles.

2.2 Chemical Properties

The main chemical component is high-purity α-Al₂O₃, with only trace amounts of SiO₂, Fe₂O₃ and other oxide impurities. It has excellent chemical inertness, and shows strong corrosion resistance to most acids, alkalis and inorganic salt solutions except hydrofluoric acid and hot concentrated strong alkali.
It will not undergo chemical reaction with most metal oxides and non-metallic powders during high-temperature melting, does not precipitate impurity ions into the sample, and effectively ensures the accuracy of experimental results, which meets the basic requirements of quantitative analysis in professional laboratories.

2.3 Thermal Performance

Alumina ceramic crucible has outstanding high-temperature resistance. The long-term stable service temperature of 99% grade reaches 1600℃, and the short-term peak working temperature can reach 1800℃ for intermittent heating cycles. Its melting point is as high as 2050℃, with low thermal conductivity and excellent thermal insulation performance, which can reduce heat loss during the experiment and maintain uniform temperature inside the cavity.
It also has reliable thermal shock resistance, and is not easy to crack under reasonable rapid temperature change, adapting to the conventional heating and cooling procedures of laboratory high-temperature furnaces.

3. Advantages of Alumina Ceramic Crucible

3.1 Superior High-Temperature Structural Stability

Unlike quartz or ordinary porcelain crucibles, alumina ceramic crucible maintains excellent structural rigidity at temperatures above 1200℃, does not soften, deform or bond with sintered materials, and can support long-time continuous high-temperature experiments, ensuring the consistency and repeatability of test results across different batches.

3.2 Ultra-Low Sample Contamination Risk

Benefiting from high-purity raw materials and dense sintered structure, the crucible has extremely low impurity precipitation during high-temperature use, and will not introduce exogenous pollution to the test sample. This makes it an ideal choice for trace element analysis, rare metal melting and high-purity material research, strictly meeting the accuracy requirements of laboratory quantitative analysis.

3.3 Durable Service Life and Cost Efficiency

With good thermal shock resistance and chemical corrosion resistance, the crucible can be reused for many times under standardized operation. Compared with disposable graphite or quartz crucibles, it has a longer service cycle, reduces the unit use cost of the laboratory, and is a cost-effective high-temperature experimental consumable for long-term batch use.

3.4 Wide Compatibility for Diverse Lab Scenarios

Alumina crucibles are available in standard cylindrical, conical and arc-bottom shapes with optional matching alumina lids, and can be fully customized according to special size or cavity requirements. They are fully compatible with most common high-temperature equipment such as muffle furnaces, tube furnaces and atmosphere furnaces, and are widely used in sample ashing, metal melting, powder calcination, ceramic sintering and precious metal refining scenarios.

Product Parameter Table

Item	Test Condition	Unit Symbol	95%	99%	85%
The main chemical ingredient			Al₂O₃	Al₂O₃	Al₂O₃
Bulk Density		g/cm³	3.6	3.89	3.4
Maximum Use Temperature			1450°C	1600°C	1400°C
Water absorption		%	0	0	< 0.2
Flexural strength	20°C	MPa (psi x 10³)	358 (52)	550	300
Coefficient of thermal expansion	25 - 1000°C	1×10⁻⁶/°C	7.6	7.9	7
Coefficient of thermal conductivity	20°C	W/m·K	16	30

Development History

Patents and certification

We’ve obtained various global certifications including CE, EMC, LVD, RoHS, FDA, MSDS, ISO 9001, SGS and TUV. We also own eight registered trademarks and forty technical patents to support independent R&D.

Our proprietary core technologies run through all product lines: porous ceramics, industrial ceramic components, special glass, metallized ceramics, liquid absorption cotton, ozone generators and silicone goods. All products are manufactured in strict accordance with international quality standards, delivering reliable and high-performance solutions that have gained wide recognition and market trust worldwide.

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Package

We adopt scientific and standardized packaging solutions tailored to product characteristics to effectively prevent collision, extrusion, dust and moisture damage. With mature global transportation system and strict shipment inspection procedures, we ensure all products remain intact and stable during long-distance delivery, providing customers with safe, efficient and reliable one-stop logistics service.

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Services

Inquiry & Customization

We provide fast and accurate quotation response for all your inquiries. Flexible OEM & ODM customization solutions are available to meet your unique product design, packaging and branding requirements.

Order Quality Control

We keep clients updated with full production progress throughout the whole order cycle. Our QC team carries out strict comprehensive pre-shipment inspection to guarantee all goods comply with your quality standards before delivery.

Customs Document Support

We prepare a full set of standard export documents including commercial invoice, packing list, certificate of origin and other certification papers, to ensure smooth global customs clearance for shipments to all destinations worldwide.

One-Stop Logistics

Multiple shipping methods including sea freight, air freight and express delivery are offered to match your schedule and budget. We supply real-time cargo tracking service so you can monitor shipment status anytime.

Flexible Payment

We support a wide range of secure international payment terms such as T/T, L/C, Western Union and other mainstream cross-border settlement methods to reduce your cross-border transaction risks.

After-Sales Support

Our professional after-sales team offers timely technical and business support all year round. We maintain steady long-term stable supply capacity to fully back up your continuous market sales and project demands.

FAQ

01 Question: Can you produce based on customers’ drawings or physical samples?

Answer: Absolutely yes. We accept technical drawings in all mainstream file formats as well as actual physical samples. Before formal production, our engineering team will provide a full professional DFM feasibility evaluation for your reference.

02 Question: How long is the production lead time for custom orders?

Answer: Sample lead time: 3–7 working days. Custom mold lead time: 5–10 working days (we will confirm the cycle separately with you for complex molds). Mass production lead time: 7–20 working days, depending on product structure complexity and order quantity.

03 Question: What’s your minimum order quantity for custom products?

Answer: We provide flexible MOQ solutions for all customized items. We will try our best to set a low minimum order volume to support your small-batch trial orders, meanwhile we can handle stable mass production to satisfy your long-term bulk demands.

04 Question: What customization services can you provide?

Answer: We support comprehensive one-stop customization, including product size, shape, appearance, precision tolerance, surface treatment, hole grooving, bending, cutting and adjustable high-temperature resistant parameters. Custom engraved LOGO and exclusive customized packaging are also available as extra personalized options upon request.

05 Question: Do you accept third-party inspection of finished products?

Answer: Yes, we fully cooperate with all mainstream authorized third-party testing institutions. Well-known organizations such as SGS, BV and other internationally recognized inspection bodies are all acceptable. We can supply complete official inspection reports and material certification documents as you require.

06 Question: Can you customize raw material options for products?

Answer: Sure. We can select and match appropriate raw materials according to your application scenarios, working conditions and performance requirements, including alumina, zirconia, quartz, silicone and other special engineering materials, and adjust related performance parameters to meet your usage standards.

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