High Purity Alumina Ceramic for High-Temperature & Electrical Insulation Applications
High purity alumina ceramic — for duty where standard 95–96% alumina fails. Higher purity means lower contamination, higher working temperature and stronger electrical insulation.
ADCERAX makes it from 99% to 99.99% Al₂O₃ (C795 / C799 / Alsint) — tubes, rods, plates, crucibles, insulators and custom parts for furnace, vacuum/plasma, electrical and lab equipment.
👉 Factory-direct, with an engineering review before quotation: send a drawing or your working conditions and we confirm the grade, feasibility and typical lead time.
What Is High Purity Alumina Ceramic?
High purity alumina ceramic refers to technical ceramics made from aluminum oxide (Al₂O₃) with a purity level of 99–99.99%. Compared with standard alumina, this material grade delivers higher thermal stability, improved electrical insulation and superior chemical resistance for demanding industrial environments.
Available High Purity Alumina Forms
Choose the form you need — each links to full specs and RFQ. All available in 99–99.99% Al₂O₃.
High Purity Alumina Tubes
Furnace, thermocouple protection & vacuum tubes
High Purity Alumina Rods
Supports, pins & insulation rods
High Purity Alumina Plates
Insulation & carrier plates, polished on request
High Purity Alumina Substrates
Substrates for electronics
High Purity Alumina Crucibles
Sintering, calcination & thermal-analysis crucibles
High Purity Alumina Boats
Combustion & sample boats
High Purity Alumina Rings
Rings, washers & high-voltage insulators
Custom Machined Parts
Drawing-based custom high purity alumina parts
High Purity Alumina (Al2O3) Ceramic Properties
High purity alumina (Al₂O₃) ceramic provides excellent thermal stability, high electrical insulation, and strong mechanical strength. Its low impurity level ensures stable dielectric performance, low porosity, and reliable resistance to chemical and plasma corrosion under high-temperature and vacuum conditions.
| Performance Parameter | Standard Alumina Ceramic (92–96%, C786) | High Purity Alumina Ceramic (99–99.7%, C795 / C799) | Ultra High Purity Alumina Ceramic (99.9–99.99%) |
|---|---|---|---|
| Al₂O₃ Content (%) | 92–96% | 99–99.7% | 99.9–99.99% |
| Bulk Density (g/cm³) | 3.6–3.75 | 3.85–3.92 | 3.95–3.98 |
| Porosity | Relatively High | Extremely Low | Near Zero |
| Flexural Strength (MPa) | 250–320 | 330–420 | 400–500 |
| Vickers Hardness (HV) | 1200–1400 | 1500–1800 | 1800–2000 |
| Dielectric Strength (kV/mm) | 10–12 | 15–18 | 20–25 |
| Volume Resistivity (Ω·cm) | 10¹² | 10¹⁴ | 10¹⁵–10¹⁶ |
| Thermal Conductivity (W/m·K) | 18–22 | 25–30 | 30–35 |
| Max. Continuous Working Temp. (°C) | 1400–1500 | 1650–1700 | 1700–1750 |
| Plasma Corrosion Resistance | General | Excellent | Outstanding |
| Dimensional Stability | General | Very Good | Extremely High |
- Typical values for selection, not certified. Continuous temp is no-load; short-term to ~1800 °C. Certified values need an engineering review.
High Purity Al2O3 Ceramic Advantages
Holds structural stability and dielectric strength under continuous high temperature and electrical load — for furnaces, heaters and insulation assemblies.
High wear resistance and low failure rate mean fewer replacements, less downtime and more predictable operating cost.
Up to 99.99% Al₂O₃ releases minimal impurities under heat or chemical exposure — keeping lab, analytical and precision processes clean.
Tubes, rods, plates, crucibles, insulators and drawing-based custom parts, machined to controlled tolerances and finishes.
🔥 Built for extreme heat. Trusted for stable output.
High purity alumina parts for consistent high-temperature performance, long-term process stability, and dependable production results.👉 Tell us your needs for a custom high purity Al2O3 ceramic design.
High Purity Alumina Ceramic Applications
High purity alumina ceramic handles the parts standard alumina can't — in high-temperature, electrical-insulation and low-contamination duty. Pick your application to see the recommended grade and forms.
High-Temperature Furnaces & Thermal Processing
Crucibles, furnace tubes, liners, setters and thermal-support parts for furnaces, sintering and continuous high-temperature processing.
- Recommended grade: 99.5% Al₂O₃ · Forms: tubes, plates, boats, crucibles, setters
- Why it fits: stable under continuous heat · low impurity keeps the process clean · long life for repeat-use consumables
Electrical Insulation & High-Voltage Systems
Insulators, rings, washers, feedthrough and support parts for high-voltage equipment, power and electronic assemblies.
- Recommended grade: 99.7% (C799) · Forms: insulators, rings, washers, tubes, feedthrough parts
- Why it fits: high dielectric strength for stable high-voltage insulation · dimensional stability keeps assemblies reliable
Semiconductor, Vacuum & Plasma Systems
Chamber parts, supports, spacers and low-contamination components for semiconductor process, vacuum and plasma equipment.
- Recommended grade: 99.7–99.99% · Forms: chamber parts, support & handling parts, spacers, insulators
- Why it fits: low contamination for clean/vacuum/plasma environments · holds up to plasma/RF and repeated high-energy exposure
Laboratory & Materials Research Equipment
Crucibles, sample boats, sample cups and high-temperature test fixtures for thermal analysis and materials research.
- Recommended grade: 99.5–99.7% · Forms: crucibles, sample boats, sample cups, plates
- Why it fits: high purity = stable, repeatable test results · resists thermal shock and reactive atmospheres
We make drawing-based custom parts in 99–99.99% Al₂O₃.
Custom High Purity Alumina Ceramic Parts
Custom high purity alumina (Al₂O₃) parts from your drawing, sample or old part — tolerances, wall thickness, stepped profiles and complex shapes, in 99–99.99% grade. Engineering review before quotation; typical lead time 3–9 weeks.
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 a drawing or sample with target grade (99–99.99%), size, tolerances and quantity. We review grade fit and manufacturability, then quote with lead time.
Once approved, we prototype 1–50 pcs in the confirmed alumina grade for fit, tolerance and thermal/insulation checks before mass production.
We form, sinter (~1650–1750 °C) and diamond-grind/polish to spec. Every batch is checked for dimensions, density, purity grade and surface finish.
Parts are cleaned for low-contamination use, protected for transit and shipped via DHL/FedEx/UPS or your carrier, with material and inspection documentation.
High Purity Alumina Ceramic, Manufactured in China to Your Drawing
ADCERAX is a China-based high purity alumina (Al₂O₃) ceramic manufacturer — consistent quality, stable lead times and engineering support, factory-direct, for buyers who need reliable supply and controlled cost in demanding conditions.
Strict control from raw high-purity powder to finished part — direct from the manufacturer, no trading middlemen.
Our engineers help you pick the right purity grade (99–99.99%) and confirm manufacturability before quotation.
From samples and small batches to volume — complex geometries, tight tolerances and drawing-based custom high purity alumina parts.
24-hour response; standard items ship fast, custom parts typically in 3–9 weeks.
ADCERAX High Purity Alumina Ceramic Manufacturing Strengths
| Manufacturing Capabilities Overview | |||
|---|---|---|---|
| Capability Item | Typical Value / Description | ||
| Purity & Material Stability | High purity Al₂O₃ ensures excellent chemical inertness, low contamination risk, and stable performance in high-temperature and vacuum environments. | ||
| Precision Geometry & Surface Quality | Tight tolerances (±0.005– ±2 mm) and clean surface finishes support accurate assembly, reliable sealing, and precise component alignment. | ||
| Customization Capability | Supports complex shapes, thin-wall structures, stepped profiles, and deep cavities for precision ceramic component designs. | ||
| High-Temperature & Vacuum Reliability | High purity alumina maintains dimensional stability under extreme heat, thermal cycling, and vacuum conditions, reducing failure risk. | ||
| Consistent Batch Quality | Every batch is verified for density uniformity and thermal performance to ensure predictable and repeatable results in critical applications. | ||
High Purity Alumina Ceramic Production Process
High purity Al₂O₃ powders are selected and blended with controlled particle size for stable sintering and consistent material purity.
CIP or dry pressing is used to achieve uniform compaction, high green strength, and accurate pre-sintered dimensions.
Sintering at 1650–1750 °C delivers high density, controlled grain structure, and reliable thermal and dielectric performance.
Post-sintering CNC grinding and polishing ensure tight tolerances (±0.005 mm) and smooth functional surfaces.
Each batch is inspected for dimensions, density, strength, and microstructural consistency before release.
Each part is ultrasonically cleaned, vacuum-packed, and labeled with batch traceability for global shipment.
FAQs About High Purity Aluminum Oxide Ceramic
Standard alumina is typically 92-96% Al2O3, while high purity alumina ceramic is 99% and above. Higher purity means fewer impurity phases, giving better high-temperature strength, higher electrical insulation and lower contamination in sensitive processes.
Impurities and glassy grain-boundary phases lower high-temperature strength, reduce insulation and can release metal ions into the process. In vacuum, plasma and semiconductor environments this contamination matters, so buyers specify purity grade and, where needed, impurity limits.
High purity alumina is typically used for continuous service in the 1650-1700 C range, with short-term, no-load exposure to higher temperatures depending on grade, part geometry, atmosphere and thermal load. The working temperature for a specific part is confirmed at engineering review.
Yes. Dense high purity alumina has low porosity and low outgassing, and is widely used for vacuum and feedthrough insulation components. The exact grade and surface state are confirmed against your vacuum and cleanliness requirements.
High purity alumina is used for low-contamination parts in vacuum, plasma and semiconductor equipment. For these duties the purity grade, impurity limits, surface state and any certification are confirmed by engineering review; semiconductor-grade qualification is not assumed by default.
Alumina is strong and hard but has moderate thermal shock resistance. Where rapid thermal cycling or steep gradients are expected, the geometry, wall thickness and grade are reviewed, and zirconia or silicon nitride may be considered for the most severe thermal shock cases.
As-fired, ground, lapped and polished surfaces are available depending on the application. Tighter surface roughness and flatness targets are confirmed at drawing review, since they affect cost and process route.
Tubes, rods, plates, crucibles, boats, rings, washers, insulators, substrates and custom machined parts can be produced. Non-standard geometries are reviewed from your drawing, sample or old part before quotation.
The main cost drivers are purity grade, part size, shape complexity, machining tolerance, surface finish and order quantity. Higher purity and tighter tolerances increase cost, which is why a drawing-based review gives the most accurate quotation.
High purity alumina parts are usually more expensive than 95% alumina, depending on purity level, machining difficulty and inspection requirements. The exact difference is confirmed per part at RFQ.
Yes. Small-batch prototyping and pilot orders are supported, especially for R&D, laboratory validation and pre-production testing.
High purity alumina offers high insulation, hardness and chemical stability at lower cost; zirconia offers higher toughness and thermal shock resistance; silicon nitride offers high strength and thermal shock performance. The right material depends on load, temperature, thermal shock and budget.
What to Send for a High Purity Alumina Quote
To quote high purity alumina parts, send what you have:
- Grade / purity: 99% / 99.5% / 99.7% (C795 / C799) or up to 99.99%
- Shape & form: tube, rod, plate, crucible, boat, ring, insulator or custom
- Dimensions & tolerance: OD / ID / length / thickness / flatness
- Surface: as-fired / ground / polished (flatness or Ra target)
- Machining: holes, slots, chamfers, threads
- Working conditions: temperature, atmosphere, vacuum / plasma, load
- Drawing, CAD/DXF, photo or old-part sample; quantity
High purity alumina serves furnace, vacuum/plasma, electrical insulation and laboratory parts. Send your details and our engineers review the fit before quoting.
*Our team will answer your inquiries within 24 hours.
*Your information will be kept strictly confidential.
info@adcerax.com
Tel:+86-0731-84428843
WhatsApp:+86 19311583352
Within 24 hours
