EMFi - New electret material for sensors and actuators

Mika Paajanen, Hannu Välimäki, Jukka Lekkala

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

91 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 Sep 199924 Sep 1999


Conference10th International Symposium on Electrets, ISE 10


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

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