EMFi - New electret material for sensors and actuators

Jukka Lekkala, Mika Paajanen

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    94 Citations (Scopus)


    ElectroMechanical Film (EMFi) is a new electret material with a cellular structure. EMFi's advantage over other solid polymer electrets is based on its flexibility due to the voided internal structure combined with strong permanent charge, which makes EMFi very sensitive to dynamic forces exerted normal to its surface. The base material is low-priced polypropylene (PP). Structure, operation and characterisation of the EMFi material is described. EMFi, which can be applied in various sensors, switches, loudspeakers and special transducers, is patented world wide.
    Original languageEnglish
    Title of host publicationProceedings, 10th International Symposium on Electrets (ISE 10)
    Place of PublicationPiscataway
    PublisherIEEE Institute of Electrical and Electronic Engineers
    ISBN (Print)0-0783-5025-1
    Publication statusPublished - 1999
    MoE publication typeA4 Article in a conference publication
    Event10th International Symposium on Electrets, ISE 10 - Delphi, Greece
    Duration: 22 Sept 199924 Sept 1999


    Conference10th International Symposium on Electrets, ISE 10


    • electromechanical
    • film
    • PP
    • piezoelectricity
    • cellular structure
    • sensors
    • actuators


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