Xinhua Xu insulating rubber O-ring

As an electrical insulator insulating rubber O-ring, have a good rubber physical and mechanical properties, the body should not be free to move there are a lot of charges that have good electrical insulation properties. The performance is usually the volume of insulation resistance, breakdown voltage, dielectric constant, power factor, and other values ??of the size of the corona comprehensive measure.

Rubber o-rings Power Factor Power factor is a measure of insulation work, an indicator of its heat and heat loss size. Typically, when the medium heat, heat loss is large, the power factor of the medium is large, the insulation performance is poor. Of course, when the insulating material or the higher the temperature the greater the humidity, the higher the power factor; the material easy to absorb water, the power factor will be high. As the insulating rubber body should try to control the power factor is less than 1% is appropriate. Wherein the selection and use of complexing agents is also important.

Rubber o-ring volume volume insulation resistance insulation resistance is a very important indicator to measure the electrical properties of the insulating material. Used as an insulator rubber o-ring rubber products according to standard regulations, the volume insulation resistance should be 1x10 13 times ohm cm; electrically insulating environment is not very high case, the volume insulation resistance should not be less than 1x10 the power of 10 ohm cm. Under normal circumstances, the volume resistivity of the large surface resistivity is large.

Rubber o-rings permittivity dielectric constant is a measure of the level of electrical conductivity parameters, the larger the dielectric constant, by the more current, the electrical insulation properties also worse. The greater the polar rubber, the greater the dielectric constant. To make the insulating rubber products have good insulation, choice and control in general having a dielectric constant not more than 4.0 is appropriate.

Rubber o-ring rubber insulation breakdown voltage per unit thickness is a measure of the level of breakdown voltage insulated rubber o-ring rubber electrical insulation performance is good or bad indispensable technical parameters. Typically, when the rubber formulation and process design reasonable, breakdown voltage test specification, the breakdown voltage of vulcanized rubber should not be less than 15KV / mm (AC) and 25KV / mm (DC), otherwise it is difficult to ensure that the rubber o-ring rubber insulation products during normal use of the safety and reliability.

Since the insulating rubber with high elasticity and conductivity is not easy, it is widely used in the magnetic field, electrical appliances, electrical circuit relating to the case of insulation protection. Most synthetic rubber at the same time have good mechanical and electrical properties, often used as an electrical insulator for labor protection insulating gloves, insulating carpets, circuit wiring plug, TV with rubber insulation products, electrical insulating sheet touch switch, high pressure insulating sheath line insulators and insulating damping pads on the car, the battery plastic shell, wire and cable, and with a variety of insulating rubber on the defense industry and other accessories.