Graphite Ring
A Graphite Ring is an annular sealing component manufactured from high-purity graphite through molding or machining. It offers excellent self-lubrication, high-temperature resistance, and chemical stability, enabling reliable sealing in high-temperature, corrosive, and oil-free environments. It is widely used in dynamic and static sealing applications for pumps, valves, reactors, compressors, and other industrial equipment.
- Custom and standard options available.
- Fast lead times guaranteed.
- High performance at a competitive price.
Graphite Ring Data Sheet
| Purity: | ≥99.9% |
| Color: | Dark Gray to Black |
| Chemical Formula: | C |
| Material Grades: | Natural Graphite, Synthetic Graphite, Specialty Graphite, Composite Graphite |
| Density: | 1.7–1.92 g/cm³ |
| Maximum Operating Temperature: | Up to 3000°C (in inert atmosphere) |
| Thermal Conductivity: | 100–200 W/m·K |
Graphite Ring Description
The Graphite Ring is an annular sealing component manufactured through winding, molding, or precision machining of high-purity flexible graphite or reinforced graphite material. It features excellent resilience, a low friction coefficient, and stable chemical inertness. Capable of maintaining sealing performance across an extreme temperature range from -200°C to +1600°C (in inert environments), it also resists corrosion from most acids, alkalis, and organic solvents. This product is widely used in static or low-speed rotational sealing applications such as high-temperature and high-pressure valves, reactors, pipeline flanges, pump shafts, and aerospace engines. It can be combined with metal reinforcement or coated with anti-oxidation layers to enhance structural strength and service life based on operational requirements.
Graphite Ring Specifications
| Category | Details |
|---|---|
| Material | Carbon Content: 98% (Industrial Grade) ~ 99.85% (Nuclear Grade) Density: Various densities up to 1.8 g/cm³ |
| Operating Parameter | In almost all media and air environments: Resistant to -200°C ~ 550°C. In a steam environment: Resistant to -200°C ~ 700°C In inert gas environment: Resistant to -200°C ~ 2500°C Resistant to fluids with a pH range of 0 – 14 (except strong oxidizers like nitric or sulfuric acid) Pressure: 100 MPa |
| Dimensions | Outer Diameter (OD): 2 – 1100 mm It can also be fabricated into angled endless rings, cut straight or at a 45° diagonal, or split into two halves. Special sizes can be customized according to order requirements or specific drawings. |
Graphite Ring Features
- Excellent Sealing Performance: Soft and dense texture conforms to irregular surfaces for reliable sealing.
- Wide Temperature Range: Stable performance from -200℃ to 1600℃ in inert atmospheres.
- Strong Chemical Inertness: Resistant to most acids, alkalis, and solvents.
- Self-Lubricating & Low Friction: Low friction coefficient, suitable for dry sealing without external lubrication.
- High Resilience: Compensates for seal face changes due to thermal expansion and vibration.
- Easy Installation & Maintenance: Can be cut or wound for on-site adjustment and replacement.
- Conductive & Thermally Conductive: Good heat transfer and electrostatic dissipation.
- Various Reinforcement Options: Can include metal laminates, inserts, or coatings for enhanced strength and oxidation resistance.
Graphite Ring Applications
- High-Temperature & High-Pressure Valve Seals: Used in valve stem and seat seals for high-temperature globe valves and gate valves in petrochemical and power industries.
- Reactor & Pipeline Flange Seals: Serve as static sealing gaskets in highly corrosive media environments.
- Pump & Compressor Shaft Seals: Applied as dynamic sealing components in rotating equipment like centrifugal and reciprocating pumps.
- Aerospace Engine Seals: Used in gas and oil sealing rings for high-temperature sections of turbine engines.
- Heat Exchanger & Boiler Seals: Employed in expansion joints and connection seals for high-temperature flue gas and steam systems.
- Semiconductor Equipment Seals: Function as sealing components in high-temperature process chambers under vacuum or protective atmospheres.
- Automotive & Marine Engine Seals: Used in sealing rings for high-temperature exhaust systems and turbochargers.
- New Energy Equipment Seals: Applied in fuel cell stack bipolar plate seals and high-temperature electrolyzer seals.
Graphite Ceramic Packaging
Graphite ceramic products are typically packaged in vacuum-sealed bags to prevent moisture or contamination and wrapped with foam to cushion vibrations and impacts during transport, ensuring the quality of products in their original condition.
Download
- SAFETY DATA SHEET (SDS) -Graphite Ring
FAQ
What is a Graphite Ring? What are the main types?
A Graphite Ring is an annular seal made from graphite material. Main types include flexible graphite spiral wound gaskets, molded reinforced graphite rings, and composite graphite rings with metal cores.
What is the maximum operating temperature of graphite rings?
In oxidizing environments, up to 450°C (with anti-oxidation coating). In inert or vacuum atmospheres, they can withstand over 1600°C long-term.
What corrosive media are graphite rings suitable for?
They resist most acids, alkalis, organic solvents, and high-temperature steam, but are not recommended for strong oxidizing acids (e.g., concentrated nitric or sulfuric acid).
How do graphite rings achieve sealing? Do they require lubrication?
They rely on the softness and resilience of graphite to conform to sealing surfaces. Their self-lubricating properties eliminate the need for external lubricants.
What is the service life of a graphite ring?
Depends on operating conditions (temperature, pressure, medium, vibration), generally 1-5 years, with longer life under stable conditions.
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