The electrical properties of polyurethane elastomers can be modified by compounding with conductive fillers.

For example, polyurethane elastomers made from MOCA-cured polyester prepolymers containing 5 pph antistatic agent or 5 pph electrically conductive carbon black were prepared. The resulting elastomers were compared in electrical conductivity to Shore 75A hardness neoprene rubber. In the comparison, the polyurethane elastomer containing the conductive carbon black showed the same electrical conductivity as the neoprene, while the polyurethane elastomer containing the anti-static agent showed much lower conductivity than the neoprene but higher conductivity compared with a neet polyurethane elastomer.

Electrical Properties of Polyurethane Elastomers

	Polyester Grades
Hardness Grade of Polyurethane Prepolymer	80A	90A	60D	70D
DC Resistivity Volume Resistivity 23°C, 50% RH Ohm-cm Impressed Voltage-500V	1.5x1010	8.3x1010	1.1x1012	6.5x1013
Surface Resistivity 23°C, 50% RH Ohms Impressed Voltage-500V	1.8x1012	4.0x1012	4.7x1013	1.4x1015
Dielectric Constant 23°C, 50% RH Frequency  60 Hz  103 Hz  106 Hz	9.53 8.51 6.87	8.66 7.82 6.00	7.29 6.49 5.23	5.60 5.12 4.53
Dissipation Factor 23°C, 50% RH Frequency  60 Hz  103 Hz  106 Hz	0.230 0.054 0.082	0.089 0.060 0.087	0.071 0.065 0.071	0.055 0.045 0.044
Dielectric Strength Electrodes 1 in apart 23°C oil temperature 500 vps rate of rise Volts/mil	310	330	250	285

	Polyether Grades
Hardness Grade of Polyurethane Prepolymer	80A	90A	95A	60D	70D	75D
DC Resistivity Volume Resistivity 23°C, 50% RH Ohm-cm Impressed   Voltage-500V	1.1x1010	1.4x1011	8.4x1012	3.6x1013	2.0x1014	1.5x1014
Surface Resistivity 23°C, 50% RH Ohms Impressed   Voltage-500V	--	--	--	--	--	--
Dielectric Constant 23°C, 50% RH Frequency   60 Hz   103 Hz   106 Hz	-- 5.93 --	-- 5.99 --	-- 5.58 --	-- 5.24 --	-- 4.88 --	-- 4.41 --
Dissipation Factor 23°C, 50% RH Frequency   60 Hz   103 Hz   106 Hz	-- 0.0224 --	-- 0.0425 --	-- 0.0442 --	-- 0.0396 --	-- 0.0324 --	-- 0.0225 --
Dielectric Strength Electrodes 1 in   apart 23°C oil   temperature 500 vps rate   of rise Volts/mil	273	282	317	314	331	339