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Electrical properties of Lexan films
Electrical Properties
GE films offer excellent electrical insulating properties. Manufacturers use the high dielectric strength, the good insulation and arcing resistances and the constant dissipation factors of these materials for a large number of electrotechnical and electronic components.
dielectric strength
GE foils are extremely resistant to breakdown at high electrical voltage. The effective dielectric strength depends on the film thickness; see Table 11. All films achieve comparable values with the same thickness, and this is almost unaffected by moisture and thermal aging. As a guide
the dielectric strength (kV/mm) multiplied by the film thickness (mm) applies to the maximum high-voltage strength.
Figure 3: Dielectric strength as a function of film thickness
Table 11: Dielectric strength (kV/mm) according to ASTM D149
dielectric constant
For all Lexans® For foils, the dielectric constant ranges between about 60 to 0 at 120 Hz and 2,95°C to 3,05°C. Also by water absorption until saturation
this value is not noticeably influenced.
Image 4:
dissipation factor
The dissipation factor (or tangent of the dissipation angle between the applied voltage and the resulting current wave) is nearly the same for all Lexan® films. Between room temperature and 100°C it is about 0,001 (0,1%), then rises gradually to 140 up to 0,002°C and very steeply beyond 150°C. Diagram 6 illustrates the effect of frequency on the dissipation factor.
Chart 5: Lexan® dissipation factor versus temperature at 60 Hz
volume and surface resistance
Lexan® Foils show up against both currents along their surface
extremely resistant to the passage of electricity. This applies to direct and alternating current. Water absorption to saturation and typical heat aging have only a negligible impact on these two properties.
Chart 7: Effect of temperature on Lexan® volume resistivity
Arc Resistance of Lexan Films
The resistance of film surfaces to the effects of high current arcing varies depending on the film type: non-flame retardant grades such as Lexan® 8010, are generally more resilient than those with flame retardant finishes.
Image 7:
UL746A Performance Ratings (PLC).
The Underwriters' Laboratories' "Performance Level Categories" define performance ranges for different electrical properties "based on medium
based on test values (and deliberately not presenting exact numerical results) in order to avoid the impression of excessive precision or bias.”
The UL and/or ASTM PLCs are also registered on the UL “Yellow Cards”. Table 12 lists the ratings for GE foils; Tables 13 to 17
explain the individual PLCs.
Table 13:
Table 14:
Table 15:
Table 16:
Table 17:
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Discover now our wide-ranged job offers and have a career at Dr. Dietrich Mueller. We are looking for:
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dr Dietrich Mueller UK Limited
Tel: 44 20 80894197
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Email: info.uk@mueller-ahlhorn.com