Index

    FFKM

    FFKM (or FFPM), also known as perfluorelastomer, is a family of elastomer materials with a fully fluorinated polymer backbone resulting in fluorine content of over 71%. This makes them elastomers with the best chemical resistance available. Chemical resistance is second to none, with good performance in a broad variety of harsh environments:  hot amines, steam, solvents, hydrocarbons etc. 

    Depending on the type, FFKM also has to highest temperature resistance available for rubber materials. And especially the combination of high temperature and chemical resistance, FFKMs are solely on the top of the elastomer world. 

    Traditionally, FFKM polymers have offered limited resistance to low temperatures, however, newer polymer chemistry now offers FFKM grades capable of sealing at temperatures down to -40°C.  

    FFKMs exist in different types, mainly difference is based on the curing agents 

    FFKM molecule

    Common FFKM Types

    Common FFKM Types

    Curing Agent

    High temperature resistance

    Specific information

    Common FFKM Types

    Peroxide

    240oC

    Broad chemical resistance

    Common FFKM Types

    Triazinic

    327oC

    High temperature, excellent mechanical properties. Reduced chemical and steam resistance

    Common FFKM Types

    Modified Triazinic

    275oC

    Broad chemical resistance, excellent mechanical properties.

    Common FFKM Types

    Modified Peroxide

    325oC

    High temperature resistance, excellent mechanical properties, reduced amine and base resistance

    A famous FFKM brand name is Kalrez from DuPont, for which ERIKS has a partnership with DuPont in many countries.   Additional, ERIKS has also an own-range of FFKM materials branded under XTR-Fluor, which is marketed in the UK. 

    FFKMs are the most expensive rubber materials, and therefore a purely item-to-item price comparison with other rubber materials is not useful.  In some cases FFKMs are the only realistic option, but in other cases the use of FFKM might provide u huge benefit in Total Cost of Ownership (less machine or factory down-time, less repairs and inspections for greater productivity and yield, better equipment/machine performance, etc). 

    FFKMs are used in different industries such as (petro)chem, food, pharma, oil&gas and semicon.  For clean high tech applications in semicon, electronics or optics, ERIKS has a special SCVBR® program, which can be found via this link. 

    Strengths & Limitations

    Temperature Resistance

    • low temperatures to -5/-15 degree C for most grades, and -40 for special ones
    • high temperatures up to 327 degree C, depending on the grade

     

    Chemical & Ageing resistance

    Strengths

    • Almost everything, specific strengths depending on the type
       

    Limitations

    • Almost none  
    Chemical Resistance Guide

    Material Comparison

    • FFKM better high temperature resistance 
    • FFKM better overall chemical resistance 
    • FFKM higher price 

    • FFKM better high temperature resistance 
    • FFKM better overall chemical resistance 
    • FFKM higher price 

    • FFKM better high temperature resistance 
    • FFKM better chemical resistance 
    • FFKM mush higher price 
    • FFKM less good for low temperatures 

    FFKM Compound overview

    Custom Engineered Solutions

    Custom Engineered Solutions

    To guarantee the best quality for custom products, we work with Six Sigma engineering methods, Finite Element Analysis (FEA) simulations and special development processes.

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    For more information on Nitrile / NBR or one of our other o-ring materials please contact one of the ERIKS Sealing & Polymer locations or fill in the form below.

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