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High fluorine content (~68–70 wt%) delivering exceptional resistance to aggressive fuels, oils, and chemicals.
Optimized low-temperature flexibility with a glass transition temperature (Tg) of approximately –15 °C.
Excellent compression set resistance after prolonged exposure to elevated temperatures up to 200 °C.
Good processability in standard rubber mixing and molding equipment, including injection and compression molding.
Outstanding resistance to modern low-sulfur diesel, biofuels (e.g., FAME), and automotive lubricants meeting ACEA and OEM specifications.
Fuel system components: O-rings, gaskets, and seals for high-pressure common rail diesel injectors.
Under-hood automotive sealing: Valve cover gaskets, turbocharger hose couplings, and EGR system seals.
Aerospace fluid handling systems: Hydraulic and fuel line seals requiring FAA-compliant elastomer performance.
Industrial chemical processing: Diaphragms, valve seats, and pump seals exposed to aromatic hydrocarbons and polar solvents.
Oil & gas downhole tools: Seals for drilling equipment operating under high temperature and sour gas (H₂S/CO₂) conditions.
| Chemical Type | Fluoroelastomer (FKM), vinylidene fluoride–hexafluoropropylene–tetrafluoroethylene terpolymer |
| Product Form | Uncured gum stock in bale form (typically 25 kg) |
| Appearance | Off-white to light tan, homogeneous solid rubber |
| Primary Applications | Dynamic and static sealing in automotive, aerospace, and industrial fluid systems |
| Key Features | High fluorine content, low-temperature flexibility, low compression set, excellent fuel resistance |
| Benefits | Extended service life in aggressive media, reduced leakage risk, compatibility with modern biofuels and low-SAP lubricants |
| Processing Recommendation | Standard FKM compounding; vulcanization via bisphenol or peroxide cure systems |
| Regulatory Compliance | Meets ASTM D1418 classification FKM; REACH compliant; no intentionally added SVHCs |
Q1: What distinguishes Tecnoflon L 636 from other FKM elastomers in the Tecnoflon portfolio?
A: Tecnoflon L 636 is a low-temperature, peroxide-curable fluoroelastomer designed for enhanced flexibility and improved compression set resistance at sub-zero temperatures, while retaining strong resistance to hydrocarbons, oils, and aggressive chemicals typical of standard FKM grades.
Q2: Is Tecnoflon L 636 suitable for dynamic sealing applications in automotive fuel systems?
A: Yes — its optimized fluorine content and peroxide cure system provide excellent resistance to modern fuel blends, including ethanol- and bio-diesel–containing fuels, making it well-suited for dynamic seals such as fuel pump O-rings, injector gaskets, and high-pressure common rail components.
Q3: How does the peroxide cure system of L 636 affect processing and compound formulation?
A: The peroxide-curable nature eliminates the need for acid acceptors and enables cleaner, lower-compression-set compounds. Formulators typically use co-agents like TAIC or TAC to optimize crosslink density, and processing requires attention to scorch safety during mixing and extrusion.
Q4: Can Tecnoflon L 636 be bonded to metals or other elastomers?
A: Yes — with appropriate surface preparation and compatible adhesives or primers, L 636 demonstrates reliable adhesion to stainless steel, aluminum, and certain phenolic or epoxy substrates. Bonding to other elastomers (e.g., NBR or HNBR) is feasible but requires formulation-specific validation due to cure compatibility considerations.
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E-mail: wangxingqiang@ericwchem.com
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Building A1, Jiete Industrial Park, Huangpu District, Guangzhou City, Guangdong Province, China
