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Material | Full Name | Core Characteristics | Color Cue (Black Variant) |
NBR | Nitrile Butadiene Rubber | The most cost-effective standard material. Exceptional resistance to mineral oils, gasoline, diesel, and hydraulic fluids. Balanced abrasion resistance and flexibility. | Universal black (most common for the seals pictured) |
FKM | Fluorocarbon Rubber (Viton) | Premium high-performance material. Outstanding chemical resistance (acids, solvents, synthetic lubricants) and heat tolerance. Low compression set for long service life. | Jet black (high-gloss finish) |
ACM | Acrylic Rubber | Automotive-grade material. Excellent resistance to engine oils (including synthetic blends), transmission fluids, and high temperatures. | Matte black (engine seal specialization) |
Casing | Carbon Steel / Stainless Steel | Provides structural rigidity, ensures press-fit stability in housing bores, and resists corrosion (stainless steel for harsh environments). | Zinc-plated (yellow/white) or uncoated (black oxide) |
1.Performance Specifications
Engineered for dynamic rotary shaft sealing, these oil seals deliver consistent performance across critical parameters:
1.1 Key Operating Limits
Parameter | NBR | FKM | ACM |
Temperature Range | -40°C to +120°C (short-term: 150°C) | -20°C to +200°C (short-term: 230°C) | -30°C to +150°C (short-term: 170°C) |
Max Operating Pressure | ≤ 0.5 MPa (5 bar) | ≤ 1.0 MPa (10 bar) | ≤ 0.8 MPa (8 bar) |
Max Shaft Speed | 15 m/s (rotary) | 20 m/s (rotary) | 18 m/s (rotary) |
Hardness (Shore A) | 70 ± 5 (standard) | 75 ± 5 (standard) | 70 ± 5 (automotive grade) |
1.2 Material Performance Metrics
Tensile Strength: ≥ 12 MPa (NBR/ACM), ≥ 15 MPa (FKM)
Elongation at Break: ≥ 250% (all materials)
Compression Set: ≤ 20% (22h @ 120°C for NBR; 22h @ 175°C for FKM)
Abrasion Resistance: Meets ISO 4649 (excellent for shaft speeds up to 15 m/s)
1.3 Design Performance
Lip Configuration: TC (double-lip with dust excluder) / TB (single-lip) / SC (single-lip, spring-loaded) – prevents oil leakage and external contamination (dust, water, debris).
Spring Tension: Constant radial force on the shaft ensures long-term sealing, even with minor shaft wear or misalignment.
Dimensional Tolerance: Complies with ISO 6194 / DIN 3760 (precision fit for housings and shafts).
3. Primary Applications
The diverse range of black oil seals (varying sizes in the image) is engineered for rotary shaft sealing across industries, with material-specific use cases:
3.1 NBR Oil Seals (Most Common)
Automotive: Wheel hubs, differential pinions, manual transmissions, power steering pumps.
Industrial: Gearboxes, hydraulic motors, water pumps, agricultural machinery (tractors, harvesters).
General Engineering: Power tools, small engines, marine outboard motors.
3.2 FKM Oil Seals (Premium)
Aerospace: Hydraulic systems, engine components (high heat/chemical exposure).
Chemical Processing: Pumps, mixers, and valves handling corrosive fluids.
Heavy Industry: High-temperature furnaces, oil refinery equipment, synthetic lubricant systems.
3.3 ACM Oil Seals (Automotive Specialization)
Engine Components: Crankshafts (front/rear), camshafts, valve stem seals.
Transmissions: Automatic transmission output shafts, torque converters.
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