Electrical properties

Table 8 shows the general electrical properties of representative grades of TORAYCON™ PBT resin. Table 9 provides a comparison to other types of resins.
TORAYCON™ possesses favorable electrical properties—its superb resistance to heat and chemicals and low water-absorption make it the optimal resin for electrical and automotive components.

Table 8: Electrical properties of Toray's TORAYCON™ PBT resin
Property		Unit	ASTM	1401X06	1101G-30
Volume resistivity		Ω·m	D257	4×10¹⁴	2.5×10¹⁴
dielectric breakdown strength		MV/m	D149
	Short duration, 1mm thickness			27	37
	Short duration, 3mm thickness			17	23
Dielectric tangent	50Hz		D150	3.3	3.7
	1kHz			3.3	3.7
	1MHz			3.3	3.6
Dielectric constant	50Hz		D150	0.002	0.002
	1kHz			0.002	0.002
	1MHz			0.02	0.02
Arc resistance		sec	D495	144	120

Table 9: Comparison of electrical properties of plastics
	Volume resistivity Ω·m	Dielectric constant 50Hz-1MHz	Dielectric tangent 50Hz-1MHz	Voltage resistance MV/m 1/8" thickness	Arc resistance s
TORAYCON™ 1401X06	4×10¹⁴	3.3	0.002-0.02	17	144
Polyacetal (copolymer)	10¹²	3.7	0.001-0.0015	20-23(1/16")	Molten
Nylon 6	7×10¹²	3.4-4.0	0.01-0.03	23	140
Polycarbonate	2×10¹⁴	2.96-3.17	0.001-0.01	16	125
Modified PPO	10¹⁵	2.64-2.68	0.0007-0.0014	20-22	-
Diallyl phthalate	2×10¹⁴	3.4-3.6	0.009-0.011	18	118
Phenol resin	10⁹-10¹⁰	5-15	0.08-0.50	12-13	20
Unsaturated polyester	10¹⁰-10¹²	3.2-4.3	0.006-0.05	20	125

Ⅰ. Volume resistivity

Figure 19: Temperature dependence of volume resistivity

Figure 19 shows the temperature dependence of volume resistivity in the non-reinforced grade (1401X06). TORAYCON™ maintains favorable electrical insulating properties across a broad range of temperatures.
Table 10 shows the dielectric resistance of the glass-fiber reinforced grade (1101G-30) after causing thermal degradation. After 1,000 hours at 150°C, there is little change.

Table 10: Dielectric resistance of TORAYCON™ 1101G-30 after exposure to a high temperature for an extended duration of time
	Surface resistivity (Ω)	Volume resistivity (Ω·m)
Before	7 x10¹³	2 x10¹⁴
After 1,000 hours at 150°C	9 x10¹³	4 x10¹⁴

Measurement conditions: Voltage 100V, temperature 23°C, 50%RH

Ⅱ. Dielectric properties

Figures 20 and 21 show the temperature dependence of dielectric properties in the non-reinforced grade (1401X06). TORAYCON™ undergoes little change in dielectric properties across a broad range of temperatures. Also, as shown in Table 8, frequency has little effect either.

Figure 20: Temperature dependence of dielectric constant
Figure 21: Temperature dependence of dielectric tangent

Ⅲ. Dielectric breakdown strength

TORAYCON™ non-reinforced grade (1401X06) exhibits favorable dielectric breakdown strength—17 MV/m at 3 mm thickness and 27 MV/m at 1 mm thickness.
The glass-fiber reinforced grade (1101G-30) does even better—23 MV/m at 3 mm thickness.
Both the 1401X06 and 1101G-30 grades maintain nearly all their dielectric breakdown strength even after two months of thermal degradation at 150°C.
According to Underwriters Laboratories, the heat-resistant temperature of the dielectric strength in TORAYCON™ 1401X06 and 1101G-30 grades is 140°C at thicknesses of 1/8 to 1/32 inch.

Ⅳ. Arc resistance

The generation of carbonized conducting paths on a resin surface resulting from arc discharge at high voltages is an important factor in the degradation of arc resistance. As shown in Table 8, the arc resistance of 1401X06 and 1101G-30 is 144 and 120 seconds, respectively—both superlative values for a thermoplastic resin.