Product Advantages
1. Material Composition & Sealing Mechanism
Fuel-resistant O-rings are molded from FKM (fluorocarbon rubber) compounded with reinforcing fillers, curing agents, and accelerators, then compression-molded and vulcanized into toroidal elastomers with circular cross-section. When compressed in a gland, contact stress is generated; sealing is established when contact stress exceeds the internal pressure of the medium. The carbon-fluorine bonds in the molecular structure provide low swell characteristics in fuel media.
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2. Fuel Media Resistance
Specifically designed for gasoline, diesel, aviation fuel, biofuels, and alcohol-blended fuels. FKM exhibits volume swell ≤8% in ASTM Fuel B (40°C×72h). Continuous service temperature range: 45°C to 300°C.
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3.Fuel System Compatibility
Suitable for long-term contact with: mineral-based fuels, oxygenated fuels (MTBE, ethanol blends), aviation fuel JP-8, diesel, and biodiesel. Seals do not harden, soften, or distort after fuel exposure.
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4. Hardness & Compression Set
Standard hardness: Shore A 70±5 (custom 50~90 available). Compression set (200℃×70h, 25% compression) ≤30%, ensuring long-term sealing contact pressure. Tensile strength ≥16MPa, elongation at break ≥150%.
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5.Full Size Range · Customization Available
Cross-section 1.0~7.0mm, OD 10~450mm. Complies with GB/T 3452.1 and AS568. Sample-based customization available without drawings – mold development 3~5 days.
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Applications
| Industry | Applications | Conditions | Seal Type |
|---|---|---|---|
| Automotive | Fuel injector O-rings, high-pressure common-rail fittings, fuel pump seals, tank cap seals, fuel line fittings | Gasoline/diesel/alcohol-blended fuels, -45°C~150°C, 0.3~25MPa | Static axial/radial, some low-pressure dynamic |
| Aviation Fuel Systems | Aviation fuel pump seals, fuel line fittings, tank port seals | Aviation kerosene JP-8/Jet A-1, -55°C~200°C | Static |
| Marine Fuel Systems | Marine engine fuel line seals, fuel filters, oil-water separators | Heavy oil/diesel/marine fuel, seawater environment | Static and low-pressure dynamic |
| Generator Sets | Diesel generator fuel lines, fuel filters | Diesel, ambient~120°C, ≤10MPa | Static |
| Construction Machinery | Fuel tank cap seals, fuel line fittings | Diesel/hydraulic oil mixed environment, -20°C~120°C | Static |
Installation & Operation Method
1. Pre-installation Inspection & Cleaning
Clean the gland and mating surfaces with a lint-free cloth soaked in acetone or alcohol to remove chips, oil films, and old seal residue. Inspect gland bottom and walls for scratches, pits, or burrs; repair or replace parts if found.
2. Lubrication
Apply a thin, uniform layer of fuel-compatible lubricant (fluorinated grease or the system fuel) on the O-ring surface to reduce installation friction and prevent surface damage.
3. Installation Procedure
Use the spiral insertion method or a tapered installation sleeve to gradually push the O-ring into the gland. Never use sharp tools. Ensure the O-ring is not twisted in the gland. Stretch the O-ring OD by no more than 2% of its original circumference to avoid permanent cross-section deformation.
4. Compression Ratio Verification
Measure gland depth and O-ring cross-section height after installation to calculate actual compression. Static seals: 15%–30% (axial) or 20%–35% (radial); dynamic seals: 10%–20%. For system pressures >10MPa, install a PTFE/PEEK backup ring on the pressure side to prevent extrusion.
WHY CHOOSE US?
1.Direct Manufacturer
Self-owned factory, 500,000 pcs/day capacity. No middleman.
2. Fast Sampling
Standard molds in stock. Custom molds 3–5 days. Same-day sampling.
3. Quality Control
Strict incoming material inspection. Dimensional tolerance: OD ±0.1mm, C/S ±0.05mm. 100% full inspection before shipment.
4. Multiple Material
FKM (-45°C~300°C), NBR (-65°C~150°C), HNBR, EPDM, VMQ, FVMQ, FFKM (327°C).
FAQ:
Q1: What is the difference between fuel-resistant O-rings and standard O-rings?
Fuel-resistant O-rings use FKM with swell ≤8% in fuels and resist temperatures up to 300°C; standard NBR swells 20–30% and limits to 120°C, failing in fuel contact.
Q2: Are FKM fuel-resistant O-rings suitable for alcohol-blended fuels (ethanol, methanol)?
Yes. FKM resists E10, E85, and M85 per our compatibility notes. For alcohol content above 85%, use special FKM grades or FFKM.
Q3: What information is required for a custom quote?
Provide: dimensions (C/S, ID/OD), material (FKM/Viton®/FFKM), Shore A hardness (default 70), maximum/minimum temperature, working pressure, and fuel type.
Q4: What are MOQ and lead time for standard vs. custom?
Standard sizes are in stock and ship within 24–48 hours. Custom orders: MOQ 100 pieces, mold development 3–5 days, production plus delivery 10–30 days (depending on order quantity).
