Electrical Properties

PROPERTIES¹	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 — 1 in² mercury)	8.8 x 10¹⁶	10¹²-10¹⁷	2 x 10¹⁵	2 x 10¹¹-10¹⁵
Surface resistivity, ohms (23ºC, 50% RH)	ASTM D257-61 (Dielectric — 1 in² mercury)	10¹⁴	n/a	n/a	n/a
Dielectric constant:	ASTM D160-65T (Dielectric — 1 in² mercury)
60 Hz		3.15	3.5-5.0	7.75-3.05	4-7.5
103 Hz		3.10	3.5-4.5	n/a	4-7.5
106 Hz		2.95	3.3-4.0	2.6-2.7	6.5-7.1
Dissipation factor:	ASTM D150-65T (Dielectric — 1 in² mercury)
60 Hz		0.020	0.002-0.01	0.007-0.001	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

1.Properties measured on parylene films, 0.001 inch thick.
2.Properties depend somewhat on deposition conditions.