Resistance-variation type moisture sensor

摘要

A resistance-variation type moisture sensor comprising a moisture sensitive film made of a moisture sensitive material which consists essentially of sodium styrenesulfonate, methylene-bis-acrylamide, polyvinyl alcohol and polyethylene glycol, said polyethylene glycol being contained in the moisture sensitive film in an amount ranging from 3 to 7 parts by weight per 100 parts by weight of sodium styrenesulfonate.