Product Overview
MOR carbon o rings and carbon graphite seal rings are critical sealing components for mechanical systems, designed to prevent fluid and gas leakage. Under standard test conditions-0.6 MPa pressure and 25℃-their leakage rate is as low as 0.01 ml/min. Crafted from high-quality carbon materials (pure carbon and carbon-graphite composites), they deliver reliable performance across demanding scenarios, with key properties including a wear rate of ≤ 0.005 mm per 1000 hours, temperature tolerance from -40℃ to 500℃, and inherent self-lubrication.
Structural Details of MOR Carbon Seal Rings
Outer Surface
Machined to Ra 0.8 μm roughness for tight housing fit. For 100 mm outer diameter rings, maximum radial clearance with housing is ≤ 0.03 mm, preventing operation shifts.
Inner Surface
Precision-ground to Ra 0.4 μm, ensuring tight shaft contact. For 50 mm inner diameter rings, contact area with shafts is ≥ 98%, eliminating leakage gaps even in 1.5 MPa high-pressure turbines.
Cross-Section
Standard rectangular cross-sections have 5 to 20 mm thickness and 10 to 30 mm width. Custom shapes (trapezoidal, U-shaped) are available with ±0.03 mm minimum tolerance, adapting to aerospace engines and specialized valves
Key Features
Wear Resistance
These carbon seal rings exhibit high wear resistance, with a measured rate of ≤ 0.005 mm per 1000 hours in high-friction rotating equipment (e.g., centrifugal pumps at 3000 rpm). This durability ensures consistent performance over 8000 to 12,000-hour service cycles, cutting component replacement frequency by 30% versus rubber or metal seals.
Thermal Stability
Carbon's inherent thermal stability supports operation from -40℃ to 500℃-the typical temperature of industrial turbines. Even at 500℃, dimensional change remains ≤ 0.1%, avoiding seal failure. This makes them suitable for gas turbines, reciprocating compressors, and aircraft engines where traditional seals deform.
Self-Lubricating Properties
Carbon's natural self-lubrication delivers a friction coefficient of 0.05 to 0.1 (lower than stainless steel's 0.15 to 0.2). Carbon-graphite composites enhance this with 15 to 25% graphite content, reducing friction by an extra 15% and extending the sealing system's lifespan by 40% versus non-lubricated seals.
Chemical Resistance
Pure carbon and carbon-graphite composites resist 95% of common corrosive chemicals (sulfuric acid, sodium hydroxide, petroleum solvents). In 30% sulfuric acid at 25℃, weight loss is ≤ 0.02% per 100 hours, preventing leakage-causing degradation. This suits chemical processing, oil and gas, and pharmaceutical industries.
Low Friction Coefficient
A friction coefficient of 0.05 to 0.1 enables smooth operation of rotating equipment. For a 100 mm diameter pump shaft at 3000 rpm, this cuts energy consumption by ~8% versus metal seals.
Dimensional Stability
Carbon retains its shape and precision under pressure and varying temperatures. For 50 to 200 mm outer diameter rings, dimensional tolerance is ±0.02 mm, ensuring a tight seal even as conditions shift.
Material Options
Pure Carbon
Pure carbon offers thermal resistance up to 500℃ and chemical resistance (≤ 0.02% weight loss in 30% sulfuric acid). It excels in constant high-temperature or corrosive scenarios, such as chemical reactors and high-temperature valves.
Carbon-Graphite Composites
Containing 15 to 25% graphite, these composites boost lubrication (friction coefficient 0.05 to 0.08) and impact resistance (30 to 40 MPa tensile strength, 20% higher than pure carbon). They're ideal for rotating shafts in centrifugal pumps and screw compressors.
Wide-Ranging Applications
Pumps and Compressors
Used in mechanical seals with ≤ 0.01 ml/min leakage. Their low friction and wear resistance suit 24/7 centrifugal pumps and screw compressors, cutting maintenance downtime by 30%.
Turbines and Engines
Handles up to 500℃ and 2 MPa. In gas turbines, they maintain ≤ 0.02 ml/min leakage and 10,000 to 12,000-hour service life, meeting power generation and aerospace standards.
Valves
Ensures leak-free operation with 0.1 to 2 MPa sealing pressure and ±0.02 mm dimensional stability. Resists corrosive media (e.g., oil and gas pipelines) and cuts maintenance frequency by 25% versus rubber seals.
Chemical Processing
Thrives in corrosive environments, sealing pipelines and reactors. In 30% sodium hydroxide, service life reaches 8000 hours-reliable for chemical plants.
Aerospace
Integrated into aircraft engines (up to 450℃) and high-performance systems. With 1.8 to 2.0 g/cm³ density (60% lighter than stainless steel) and ≤ 0.1% failure rate over 5000 flight test hours, they meet aerospace requirements.
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