electrical properties of parylene and other conformal coverings
PROPERTIES METHOD OR CONDITIONS PARYLENE C EPOXIES2 SILICONES2 URETHANES2
Dielectric strength, volts/mil short time (1 mil films) ASTM D149-64 5,000
Corr. to 1/8" ASTM D149-64 590 400-500 550 450-500
Step-by-step (1 mil films) ASTM D149-64 4,700 n/a n/a n/a
Volume resistivity, ohms (23ºC, 50% RH) ASTM D257-61 (Dielectric --1in2 mercury 8.8 X 1016 1012-1017 2 X 1015 2 X 1011-1015
Surface resistivity, ohms (23ºC, 50% RH) ASTM D257-61 (Dielectric --1in2 mercury 1014 n/a n/a n/a
Dielectric constant: ASTM D160-65T (Dielectric --1in2 mercury  
60 Hz 3.15 3.5-5.0 7.75-3.05 4-7.5
103 Hz 3.10 4.5-4.5 n/a 4.7.5
106 Hz 2.95 3.3-4.0 2.6-2.7 6.5-7.1
Dissipation factore: ASTM D160-65T (Dielectric --1in2 mercury  
60Hz 0.020 0.002-0.01 0.0007-0.001 0.015-0.017
103 Hz 0.019 0.002-0.02 n/a 0.05-0.06
106 Hz 0.013 0.03-0.05 0.001-0.002 n/a

 

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