Products Description
| Product Name | FKM Tubing |
| Product Form | Hollow circular extruded hose |
| Main Applications | Automotive fuel delivery, acid/alkali/hot oil/steam fluid transfer, vacuum-resistant sealing lines, and wire protection sheathing in harsh environments |
| Features | High/low temperature resistance, gasoline/alcohol-blended fuel resistance, strong acid/alkali corrosion resistance, ozone aging resistance, low fuel permeability, vacuum resistance |
| Material | FKM |
| Common Sizes | ID×OD (mm): 1×3,2×4,3×5,4×6,4×7,5×7,5×8,6×9,7×10,8×12,10×14,12×16,13×18,14×20,16×20,18×24,20×26,25×31,32×38,38×44, customizable |
| Operating Temperature | Continuous: -20℃ ~ 220℃; Short-term peak: ≤ 315℃; Low-temperature brittleness limit: approx. -40℃ (static sealing) |
| Installation Method | Cut to length, assembled with hose clamps/quick-connect fittings, flexible bending installation supported |
| Core Advantages | Exceptional comprehensive chemical resistance, extremely low fuel swelling rate, far superior high-temperature resistance compared to general-purpose rubber, perfectly suited for harsh engine compartment conditions |
| Quality Certifications | ROHS, REACH, ISO9001, IATF16949 |
Product Advantages
Product Advantages
1.Superior Mixed Fuel Resistance: Resists regular gasoline and high-proportion ethanol/methanol blended fuels (E10, E85, M30, etc.). Exhibits extremely low volume swelling rate after long-term immersion, with no softening or cracking; features extremely low fuel permeability, meeting environmental evaporative emission requirements.
2.Wide Safe Temperature Range: Capable of long-term stable operation from -20℃ to 220℃, with short-term resistance to 315℃ thermal shocks, perfectly handling radiant heat around carburetors and turbochargers.
3.Comprehensive Chemical Resistance: Demonstrates excellent resistance to strong acids, strong alkalis, hot mineral oils, steam, and aromatic solvents, while offering outstanding ozone and UV aging resistance with high outdoor storage stability.
4.Proven Industrial Applications: Widely used in automotive fuel systems and high-end industrial hydraulic equipment, with mature application cases in aero-engines, semiconductor etching equipment, and other high-precision machinery sectors, backed by fully validated technology.
5.Flexible Specifications with Customization Support: Dozens of standard ID/OD sizes available in stock, supported by cut-to-meter or fixed-length supply; non-standard sizes can be custom-molded to meet diverse equipment assembly requirements.
Installation Instructions
Selection & Cutting: Select the appropriate ID×OD specification based on working pressure, temperature, and medium. Cut squarely to required length using a sharp blade, ensuring a smooth, burr-free cut.
Fitting Assembly & Routing: Insert fittings into both ends and secure with hose clamps to specified torque. Route the hose with a bending radius no less than 10×OD, avoiding sharp edges and high-temperature exhaust pipes.
Leak Check Before Commissioning: Before startup, introduce medium at low pressure to verify all connections are leak-free, then gradually increase pressure/temperature for formal operation.
Application Scenarios & Precautions
Application Scenarios
- Automotive Power Sector: Engine carburetor feed lines, high-pressure fuel injection system return lines, carbon canister purge lines, E85 flexible-fuel vehicle fuel lines.
- General Industrial Sector: Hot oil circulation lines, steam tracing hoses, acid/alkali chemical transfer hoses.
- Specialized Equipment Sector: Vacuum coating machine vacuum-resistant sealing lines, servo motor high-temperature oil tube protective sheaths.
- High-End Manufacturing Sector: Aviation kerosene lines, precision analytical instrument corrosion-resistant fluid lines.
Precautions
1.Avoid Minimum Radius Bending: During installation, the bending radius must not be less than 10 times the hose's outer diameter. Prolonged sharp bending will cause structural damage to the reinforcement layer or permanent creases, severely affecting pressure-bearing capacity and service life.
2.Media Compatibility Pre-Check: Although FKM resists the vast majority of chemicals, low-molecular-weight esters, ketones, and certain amines may still cause slow erosion. For non-standard media, it is recommended to conduct immersion tests or consult the manufacturer beforehand.
3.Strictly Avoid Over-Temperature Use: Continuous operation above 220℃ will accelerate defluorination and hardening of the fluororubber main chain, leading to seal failure. Short-term peak temperature must not exceed 315℃. 4.Scratch Prevention & Regular Inspection: Avoid scraping the tube wall with sharp metal edges during assembly, as surface damage is a direct cause of leakage. It is recommended to inspect the hose every 3 months; if hardening, cracking, or blistering is found, replace immediately.
Performance Comparison
| Comparison Dimension | FKM | NBR | EPDM | MQ | CR |
|---|---|---|---|---|---|
| Gasoline/Mixed Fuel Resistance | Good (low swelling) | Good (not resistant to alcohol-blended gasoline) | Very Poor | Very Poor (severe swelling) | Fair (prone to aging) |
| High-Temperature Resistance (Long-term) | 220℃ | 100℃ | 120℃ | 250℃ | 130℃ |
| Strong Acid/Alkali Resistance | Excellent | Excellent | Excellent | Poor | Excellent |
| Ozone/Weather Resistance | Excellent | Poor | Excellent | Excellent | Good |
Conclusion: Among all common rubbers, FKM is the optimal choice for fuel lines and high-temperature corrosive media applications, with the only drawback being higher raw material cost compared to general-purpose rubbers.
Company Profile
Tianjin Ruidi International Trade Co., Ltd. has been in the rubber business since 1987. Headquartered in Tianjin, we run a 70,000m² manufacturing facility with over 100 production lines, focusing on custom OEM/ODM solutions for refrigeration, automotive, and industrial customers.
Our products are used in HVAC systems, automotive fuel lines, and industrial hose assemblies, and are exported to Southeast Asia, the Middle East, North America, and Africa.
What Makes Us Different
R&D That Knows the Standards – Our engineering team includes professionals who have contributed to drafting national rubber product standards in China.
Quality Control at Every Stage – In-house testing labs monitor from material incoming inspection to finished product verification, ensuring consistency across production runs.
Global Experience – Exported to over 15 countries including the US, Japan, Germany, Brazil, and the UAE, giving us insight into diverse technical specs and documentation requirements.
why choose our products?
Engineered for Real-World Conditions
Our FKM tubing is formulated to handle under-hood heat, fuel blends, and vibration over years of service, not just lab testing.
Application-Specific Selection Support
Not sure which ID, wall thickness, or durometer fits your fuel system? We help you match the right tubing to your specific engine model, fuel type, and operating temperature range - drawing on our experience with similar applications to narrow down the options.
In-House Quality Control from Raw Material to Finished Product
Each batch is tracked from compound mixing through extrusion and final cutting. We test for dimensional accuracy, hardness, and heat aging to ensure every meter meets the spec you ordered.
One-Stop Solution for Fluid Handling Systems
Beyond tubing, we supply compatible fittings, clamps, and custom-cut lengths - so you get a complete, ready-to-install kit from a single source, saving you sourcing time and minimizing compatibility issues.
Tianjin Ruidi International Trade Co., Ltd
Langfang Ruidi New Material Tecnology Co.,LTD
Our address
3001 Maoye Building, Haihe East Road, Hebei District, Tianjin 300140 P.R.China
Phone Number
+86 189 0205 0338
topsales@rubberproduct.net
Inner Pursuit . Altruism Green · Resilience
FAQ
Q1: Can this tubing be used for automotive gasoline lines or carburetor fuel lines?
Q2: What is the maximum operating temperature? Can it work at 250℃ continuously?
Q3: Do you support cutting into short sample lengths? What is the minimum order quantity?
Q4: How to choose between this and silicone tubing?
Q5: Can you provide samples for testing?
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