Electrical insulation characteristics
Dialectric strength
To express electrical insulating properties, volume resistivity or dielectric strength is widely used as an index. The volume resistivity is expressed in terms of electrical resistance calculated per unit volume of the test piece. The dielectric strength is expressed in terms of the magnitude of voltage withstood without destruction of the test piece when a specified amount of voltage is applied for a specified period of time. In both cases, a higher value means better electrical characteristics.
A primary choice choice for electric cables
As shown in the charts, the volume resistivity of PVC products is slightly lower than those of olefin resin products, but since higher fire resistant properties are required for electrical components, PVC is used widely in a variety of applications such as electric cables for residential buildings, vehicles, household electrical appliances, cable coverings, insulating tapes, switch boxes, wire coverings, and protecting tubes for power and telecommunications cables.