Alumina Crucibles & Tubes | High Purity Al₂O₃ >99%

Product Overview

Our high-purity alumina crucibles and tubes are manufactured with Al₂O₃ content exceeding 99%, ensuring minimal contamination of your samples or melts. They offer excellent thermal shock resistance, chemical inertness, and high mechanical strength up to 1750°C. Available in standard sizes or custom dimensions based on your drawings.

Why Choose FOVO Alumina Crucibles & Tubes?

• Ultra-high purity — Al₂O₃ >99%, no contamination of your samples or melts
• Built for extreme heat — Continuous use up to 1750°C–1800°C
• Thermal shock resistant — Withstands rapid heating and cooling cycles
• Chemically inert — Non-reactive with most molten metals, fluxes, and acids
• Standard & custom sizes — From 3ml to 500ml crucibles, custom dimensions available
• Batch-to-batch consistency — Reliable purity and dimensions, every order

Key Features

• High purity (Al₂O₃ >99%) – No contamination of samples
• Excellent thermal shock resistance – Withstands rapid heating and cooling
• Chemically inert – Resistant to most molten metals, fluxes, and acids
• High density (3.85 – 3.90 g/cm³) – Low porosity, good mechanical strength
• Custom sizes – Non-standard dimensions available on request

Technical Specifications

Item	Specification / Capability
Material & Purity	High purity alumina (Al₂O₃ >99%)
Bulk Density (g/cm³)	3.85 – 3.90
Max. Continuous Use Temperature (°C)	1750°C (short-term up to 1800°C)
Flexural Strength (MPa)	≥ 360
Water Absorption (%)	0
Thermal Conductivity (W/m·K)	≈ 32 (at room temperature)
Linear Expansion Coefficient (10⁻⁶/°C)	≈ 8 (200–500°C)

Standard Sizes – Crucibles

Capacity (ml)	Top OD (mm)	Bottom OD (mm)	Height (mm)
3	20	16	17
5	26	18	21
10	30	20	28
15	35	21	30
20	38	24	35
30	45	27	39
50	50	30	48
100	61	31	60
150	73	43	67
200	82	43	70
300	88	53	85
500	108	62	108

Other capacities (e.g., 25ml, 40ml, 1000ml) and shapes (cylindrical, conical, with lid) available on request.

Standard Sizes – Alumina Tubes

Outer Diameter (mm)	Inner Diameter (mm)	Length (mm)	Purity
10	6	100 – 500	>99%
15	10	100 – 500	>99%
20	14	100 – 500	>99%
25	18	100 – 500	>99%
30	25	100 – 500	>99%

Custom diameters and lengths (up to 2000mm) available upon request.

Typical Applications

Rare Earth and Precious Metal Melting

Suitable for melting crucibles for rare earth metals (e.g., neodymium, dysprosium, terbium) and precious metals (e.g., platinum, gold, silver). Made from high-purity alumina (Al₂O₃ >99%) with excellent chemical inertness to rare earth and precious metal melts at 1800°C — non-sticking and non-contaminating. A critical consumable for rare earth refining and precious metal casting.

Ceramic and Electronic Material Sintering

Suitable for high-temperature sintering boats and protection tubes for advanced ceramics (e.g., silicon nitride, silicon carbide, piezoelectric ceramics) and electronic materials (e.g., barium titanate, zirconia). Alumina crucibles offer temperature resistance up to 1750°C–1800°C with excellent thermal stability and high dimensional accuracy (±0.5mm), meeting demanding requirements for precision sintering processes.

High-Temperature Boats for Polycrystalline Mullite Fiber Production

Suitable for high-temperature boats and collection devices used in polycrystalline mullite fiber and alumina fiber production. High-purity alumina material offers excellent thermal stability and can withstand continuous 1800°C operation without reacting with fiber materials, ensuring product quality.

Laboratory Thermal Analysis

Suitable for alumina crucibles and sample boats for TGA (Thermogravimetric Analysis), DSC (Differential Scanning Calorimetry), and other thermal analysis instruments. Standard specifications are available, with custom sizing to instrument models to meet the replacement needs of research laboratories.

Selection Guide: Alumina Crucible vs. Other Materials?

Material	Maximum Use Temperature	Suitable Applications	Not Suitable For
High-Purity Alumina (>99%)	1750°C–1800°C	Rare earth/precious metal melting, high-purity ceramic sintering, crystal growth	Carbon-containing atmospheres (reacts)
Standard Alumina (95–98%)	1600°C–1650°C	General ceramic sintering, conventional heat treatment	High-temperature impurity volatilization may contaminate products
Polycrystalline Mullite Fiber	1600°C–1800°C	Lightweight insulation, custom-shaped parts	Applications requiring melt containment

Need Help with Selection?

Not sure which crucible material, size, or purity grade suits your application? Share your operating temperature, melt chemistry, and process requirements with us — our engineers will provide a free recommendation within 24 hours.