Electrical Properties of SUMIKASUPER LCP

Liquid crystalline polymer products all possess low, stable values for the dependence of dielectric constant and dielectric dissipation factor on temperature and frequency. However, the absolute values for these properties are higher than those of other engineering plastics (Figure 1 and Figure 2). In other words, although heat generation tends to be greater at higher frequencies, this does not cause problems during actual usage, due to the extremely high deflection temperature under load. Moreover, the dielectric dissipation factor for liquid crystal polymers is low within the GHz region.

Figure 1 : Temperature Dependence of Dielectric Tangent

Figure 1 : Temperature Dependence of Dielectric Tangent

Figure 2 : Frequency Dependence of Dielectric Tangent

Figure 2 : Frequency Dependence of Dielectric Tangent

Table 1 : Electric Characteristics

Item Test Method Unit E5008L E5008 E4008 E4006L E6008 E6006L E6807LHF
Filler     GF GF GF GF GF GF GF
/Inorganic
Dielectric constant (103Hz) ASTM D150   4.7 4.7 4.5 4.4 4.4 4.3 4.3
(106Hz) 4.2 4.2 3.9 3.7 3.9 3.7 3.8
(109Hz)* - - - - 3.3 3.2 -
*Dielectric tangent (103Hz) 0.013 0.015 0.018 0.023 0.022 0.023 0.020
(106Hz) 0.031 0.031 0.034 0.034 0.032 0.034 0.030
(109Hz)* - - - - 0.005 0.005 -
Specific volume resistance ASTM D257 Ωm 1013 1013 1013 1013 1013 1013 1013
Dielectric Breakdown voltage Short time method MV/m 37 >40 36 >40 26 39 -
Electric arc resisrance ASTM D495 sec 128 128 130 130 130 130 180
Tracking resistance IEC method V 185 175 145 135 125 115 150

*Measurement method : Resonant Cavity method

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