Overview
Liquid fluoroelastomer is a high-performance fluoropolymer rubber supplied in uncured liquid form for precision applications. Developed as an alternative to solid FKM for complex geometries, it cures into elastomers with superior resistance to fuels, oils, and aggressive chemicals. Unlike conventional rubbers, its molecular structure contains fluorine-carbon bonds that provide exceptional thermal stability, with continuous service temperatures up to 250°C. The liquid form enables application methods like casting, spraying, or injection molding before vulcanization.
Physical and Chemical Properties
The material exhibits low compression set (typically <20% after 70hrs at 200°C) and maintains elasticity across a wide temperature range (-20°C to +250°C). Its fluorine content (usually 65-70%) directly correlates with chemical resistance—higher grades withstand concentrated acids and solvents. Key metrics include viscosity (commonly 10,000-50,000 cP at 25°C for processing) and cure time (varies from minutes to hours depending on catalyst systems). Post-cure, it achieves Shore A hardness of 50-90 with tensile strength of 10-20 MPa.
Main Applications
In aerospace, liquid FKM coats fuel system components and seals turbine engine parts exposed to jet fuels. Automotive uses include molded-in-place gaskets for turbochargers and transmission seals where thermal cycling occurs. The chemical industry employs it for lining reaction vessels and as a barrier layer in flexible hoses handling corrosive media. Emerging applications include 3D-printed seals for semiconductor equipment and medical device coatings requiring steam sterilization.
Safety and Storage
Uncured material requires handling with nitrile gloves and eye protection due to potential skin sensitizers. Storage life is typically 6-12 months in original sealed containers under nitrogen blanket to prevent premature crosslinking. Curing releases volatile byproducts—adequate ventilation or local exhaust is mandatory. Fully cured elastomers are chemically inert and safe for contact with food/pharmaceuticals in compliant formulations (FDA 21 CFR 177.2600).
B2B Procurement Guide
Industrial buyers should specify: 1) Fluorine content percentage (standard vs. high-resistance grades) 2) Required viscosity for application method 3) Cure system (peroxide vs. bisphenol) compatibility with substrates 4) Compliance certifications (e.g., NSF, UL). Bulk orders (200kg+) often qualify for 10-15% discounts. Lead times vary from 2-8 weeks for specialty formulations. Quality verification should include third-party testing for compression set and chemical resistance per ASTM D2000 M2HK classifications.
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