| 摘要 |
PROBLEM TO BE SOLVED: To provide a conductive coating, a conductive coated film, a crack detecting coating, and a crack detecting coated film, which have a volume resistivity optimum for detecting cracks, which are easy to install at a site, and with which cracks can be acculately detected. SOLUTION: The crack detecting coating film 1 is formed by applying a conductive coating containing a carbon black and an epoxy resin. If a pair of electrodes 2a and 2b are arranged on the crack detecting coated film 1 and a crack C is introduced between the electrodes, the increase amount of the resistance between the electrodes is larger when the length of the crack C is longer, and a crack C of a very small length can be detected when the width W of the crack detecting coated film 1 is narrower. For example, in the case of applying the crack detecting coated film 1 in a width W=5 mm or smaller, a crack C of 1 mm or shorter can be detected, and in the case of applying the crack detecing coated film 1 in a width W=about 1 mm or smaller, a crack C of about 0.5 mm or shorter in length can be detected. COPYRIGHT: (C)2005,JPO&NCIPI
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