chemical film dielectric

chemical film dielectric

[′kem·i·kəl ‚film ‚dī·ə′lek·trik]
(electricity)
An extremely thin layer of material on one or both electrodes of an electrolytic capacitor, which conducts electricity in only one direction and thereby constitutes the insulating element of the capacitor.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.