Graphite Moulded Rings
High-efficiency, moulded graphite sealing rings, produced to precise density and size. They are manufactured from expanded high purity flexible graphite foil with an oxidation inhibitor. They do not contain binders, elastomers or fillers
Prime features
- Outstanding sealing performance over long adjustment-free periods.
- Excellent chemical resistance.
- Very wide temperature range.
Typical applications
Valves and rotary equipment handling virtually any media. These rings are ideal for duties with high-temperature steam, demineralised water, heat transfer media, petroleum products, inorganic and organic acids, alkalis, hot waxes and oils.
Material properties
- Compatible with media in the range pH 0-14.
- Sulphur content (typical): ≤300 ppm.
- No loss of volatiles at high temperature.
- Lower limiting temperatures apply when used with oxidising agents, e.g. nitric acid.
- Thermal conductivity, ring of density 1.4g/cm3: (SG 1.4): axial: 400W/mK; radial: 6W/mK.
- Coefficient of friction to steel: 0.05.
How supplied
Precision moulded rings in endless form, or with single split or matched scarf-split halves. Sections 1.5 mm to 40 mm (1/16″ to 19/16″); diameters 2 mm to 1200 mm (or 3 /32″ to 47¼”).
VALVE STEM DUTIES
Maximum Operating Temperatures
Steam
+650°C (+1202°F)
Oxidising conditions
+500°C (+932°F)
Non-Oxidising conditions
+1000°C (+1832°F)
Maximum Operating Temperatures
-200°C (-328°F)
Maximum System Pressure
25 MPa/250 bar
(3626 psi)
Advantages of AQPA INDONESIA Graphite Moulded Rings
Graphite moulded rings can operate at elevated temperatures without losing their sealing performance. They are ideal for turbines, valves, boilers, steam lines, and industrial process equipment.
Graphite material offers excellent resistance to various process media, including steam, hot water, oil, industrial gases, and many chemical substances.
The compressed graphite structure provides excellent sealing capability. Leakage can be minimized even under demanding operating conditions.
Graphite has a low coefficient of friction, helping reduce wear on valve stems and other moving components.
The product can withstand repeated temperature fluctuations without significant performance degradation.
Stable sealing performance helps minimize leakage risks and extend maintenance intervals.
AQPA INDONESIA can manufacture graphite moulded rings according to customer drawings, dimensions, and application requirements.
These products are widely used in power generation, oil & gas, petrochemical, fertilizer, cement, pulp & paper, and mining industries.
Why Choose AQPA INDONESIA?
- Trusted Industrial Sealing Solutions
- Professional Technical Support
- Customized Products
- Focus on Quality and Reliability
AQPA INDONESIA Graphite Moulded Rings are high-performance sealing solutions designed for high-temperature and high-pressure applications. Manufactured from premium-grade graphite, these rings provide excellent thermal resistance, superior chemical compatibility, and reliable sealing performance for turbines, valves, pumps, and other critical industrial equipment.
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