What Is Recrystallised Alumina (Alsint)?
Recrystallised alumina (often abbreviated to RCA) is a high-purity ceramic material used for manufacturing protection sheaths, insulators, and support components for high-temperature sensors. Unlike standard aluminous porcelain, recrystallised alumina is engineered for extreme thermal environments, making it ideal for applications that regularly exceed 1500 °C.
Recrystallised alumina is commonly selected for its exceptional temperature resistance, high mechanical strength, and outstanding chemical stability. In industrial processes where long-term exposure to heat, corrosive atmospheres, or thermal cycling is expected, RCA offers reliability and extended service life.
Peak Sensors supplies Recrystallised Alumina Tubes in a wide range of diameters and lengths, including closed-end thermocouple protection tubes and open-both-ends tubes for specialist assemblies.
Specification
- Basic Composition: 99.7% Al₂O₃ (high-purity aluminium oxide)
- Composition: >99.7% high-purity alumina (Al₂O₃)
- Maximum Temperature: Up to 1700 °C
- Density: Approximately 3.9 g/cm³
- Thermal Conductivity: Around 26 W/m·°C
- Mechanical Properties: Strong and durable with excellent chemical and wear resistance
- Common Applications: Kilns, incinerators, furnaces, chemical plants, heat treatment processes
Why Choose Recrystallised Alumina?
- Exceptional High-Temperature Performance – RCA maintains strength and structure at temperatures where aluminous porcelain begins to fail, making it ideal for steelmaking, heat treatment, kiln monitoring, and laboratory furnaces.
- High Purity & Low Contamination – With a purity of nearly 100% alumina, recrystallised alumina resists contamination and is suitable for critical process control applications.
- Superior Chemical & Corrosion Resistance – It withstands aggressive chemical attack, making it dependable in reducing, oxidising, and inert gas atmospheres.
- Thermal Shock Durability – Although not as shock-resistant as aluminous porcelain, RCA offers stable performance under consistent high-temperature cycling.
Recrystallised Alumina Tubes from Peak Sensors
Peak Sensors offers a comprehensive range of Recrystallised Alumina Tubes for UK industries, including:
- Closed-one-end tubes for thermocouple protection
- Open-both-ends tubes for sensor assemblies and support structures
- Custom sizes tailored to specific furnaces or industrial systems
- Compatibility with Type B, S, R, and other high-temperature thermocouples
We supply to a wide range of UK sectors, including aerospace, metallurgy, ceramics, energy, and scientific research.
Typical Applications
- High-temperature thermocouple protection
- Laboratory and industrial furnaces
- Atmosphere-controlled ovens
- Glass, steel, and metal processing
- Kiln furniture and support components
- Chemical process monitoring
Need Recrystallised Alumina Components?
Peak Sensors can supply standard or custom RCA tubes manufactured for high accuracy and long service life. Get in touch for pricing, lead times, or bespoke designs.