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EFFECT OF MOISTURE UPON ELECTRICAL RESISTANCE OF EMBEDDING CEMENTS *
Author(s) -
Melton R. L.,
Brownell K. W.,
Easter G. J.
Publication year - 1935
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1935.tb19356.x
Subject(s) - borax , materials science , moisture , composite material , cement , glass recycling , resistor , electrical resistance and conductance , ceramic , bentonite , casing , casting , geotechnical engineering , raw material , geology , electrical engineering , chemistry , organic chemistry , voltage , petroleum engineering , engineering
For insulating electrical resistors from the casing of household appliances, etc., ceramic cements when properly applied are superior to other materials. If not sufficiently vitrified after application, however, they absorb moisture, thus tending to lower their resistance sufficiently to permit users of the appliances to experience electrical shocks. The necessary firing temperature varies widely with different cements. Some are satisfactory when cured by the heat of the embedded resistor alone while others are not. The hygroscopic properties are shown to be markedly increased by the presence in the cement of bentonite, borax, mica dust, or glass cullet. The borax also reduces the ultimate resistance objectionably at higher temperatures. The apparatus used for testing is described in detail.