Volume Resistivity

The volume resistivity of a material is defined as the electrical resistance indicated by the unit cube of the material, which indicates the current flowing through the material when a voltage of DC 500V is applied to the material for one minute. The higher the electrical insulation, the higher the volume resistivity. SUMIKASUPER LCP has high insulation due to the strong orientation of the skin layer.

Figure 3-6-1 Volume Resistivity and Electric Strength of SUMIKASUPER LCP

Insulation Characteristics

The electric strength is an index for indicating how high a voltage a material can withstand without causing dielectric breakdown. Test results are reported in kV/mm, and the dielectric strength is affected by the thickness and temperature of the test piece. The electric strength of SUMIKASUPER LCP increases as the thickness decreases, similar to the tensile strength. In addition, the electric strength remains high when heated, so it has excellent insulation characteristics.

Dielectric properties

SUMIKASUPER LCP possess low, stable values for the dependence of dielectric constant and dielectric dissipation factor on temperature and frequency.The dielectric dissipation factor of LCP is especially low in the gigahertz range.

Table 3-6-1 Electrical Properties of SUMIKASUPER LCP

Test item		Test method	E5008L	E5008	E5204LB	E4008	E4205R	E6008
Relative permittivity	1kHz	IEC 60250	4.7	4.7	-	4.5	-	4.4
	1MHz		4.2	4.2	3.1	3.9	2.9	3.9
	1GHz		3.7	3.7	3.0	3.7	2.8	3.8
	10GHz	IEC 62810	3.8	3.7	3.0	3.6	2.9	3.7
Dielectric dissipation factor	1kHz	IEC 60250	0.013	0.015	-	0.018	-	0.022
	1MHz		0.031	0.031	0.018	0.034	0.013	0.032
	1GHz		0.005	0.005	0.006	0.005	0.004	0.005
	10GHz	IEC 62810	0.005	0.005	0.012	0.006	0.005	0.006

Test item		Test method	E6006L	E6007LHF	E6807LHF	SR1009
Relative permittivity	1kHz	IEC 60250	4.3	-	4.3	-
	1MHz		3.7	3.8	3.8	4.0
	1GHz		3.7	3.8	3.5	4.0
	10GHz	IEC 62810	3.5	3.6	-	4.0
Dielectric dissipation factor	1kHz	IEC 60250	0.023	-	0.020	-
	1MHz		0.034	0.026	0.030	0.008
	1GHz		0.005	0.005	0.004	0.003
	10GHz	IEC 62810	0.005	0.005	-	0.005

Table 3-6-2 Electrical Properties of SUMIKASUPER LCP

Test item		Test method	E6205L	SR1205L	E6808LHF	E6808UHF	SV6808THF	SV6808GHF
Relative permittivity	1kHz	IEC 60250	-	-	-	-	-	-
	1MHz		3.0	2.8	3.8	3.8	3.8	3.8
	1GHz		2.9	2.8	3.6	3.5	3.5	3.5
	10GHz	IEC 62810	2.8	2.7	3.7	3.6	3.7	3.7
Dielectric dissipation factor	1kHz	IEC 60250	-	-	-	-	-	-
	1MHz		0.024	0.007	0.038	0.033	0.012	0.029
	1GHz		0.005	0.002	0.004	0.004	0.004	0.004
	10GHz	IEC 62810	0.005	0.003	0.005	0.004	0.004	0.005

Test item		Test method	SR2506	SR2507	SZ6505HF	SZ6506HF
Relative permittivity	1kHz	IEC 60250	-	-	-	-
	1MHz		3.6	3.7	3.8	3.5
	1GHz		3.5	3.5	3.4	3.5
	10GHz	IEC 62810	3.6	3.7	3.5	3.6
Dielectric dissipation factor	1kHz	IEC 60250	-	-	-	-
	1MHz		0.029	0.029	0.023	0.011
	1GHz		0.004	0.004	0.004	0.005
	10GHz	IEC 62810	0.003	0.003	0.004	0.003