SYMPOSIA PAPER Published: 01 January 1954

Effect of Temperature on the Electrical Resistivity of Several Ceramic and Silicone-Type Coatings


The electrical resistivity of sheet mica, a ground coat porcelain enamel, two alkali-free ceramic coatings, a silicone varnish, and a coating consisting of a silicone varnish mixed with ground mica was measured in the temperature range 100 to 500 C and at an applied direct current potential of 200 v. A plot of the logarithm of the resistivity versus the reciprocal of the absolute temperature for each of these materials showed that marked deviations from the Rasch-Hinrichsen law occurred only with silicone and silicone-mica coatings. The electrical resistivity of all coatings tested was found to be independent of coating thickness and of duration of aging at 200 C. The measured resistivities in ohm-cm of the materials when tested at 400 C were (a) silicone-mica coating, 1400 × 108, (b) mica, 320 × 108, (c) silicone varnish coating, 280 × 108, (d) alkali-free ceramic coating, 1.6 × 108, and (e) ground coat enamel, 0.0025 × 108.

Author Information

Strauss, Simon, W.
, Washington, D. C.
Richards, Lloyd, E.
, Washington, D. C.
Moore, Dwight, G.
, Washington, D. C.
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Developed by Committee: B08
Pages: 101–108
DOI: 10.1520/STP47977S
ISBN-EB: 978-0-8031-8369-8
ISBN-13: 978-0-8031-6858-9