Jia Chang Electric Insulation Industrial Co., Ltd. was established in 1984, and currently we have factories located in Shanghai, China. We have 20 years experience of manufacturing a variety of electrical insulation materials. We have been exporting our products to regions in Asia, the USA, and continental Europe for many years now. At Jia Chang we are able to produce many different electrical insulation sleeves by using materials such as fiberglass, polyester, silicon rubber, and several others insulation materials. Generally, the nominal inside diameter is between 0.5 and 30mm, and our products have breakdown voltages of between 1,000 and 10,000 volts, retaining a maximum working temperature of between 105 centigrade and 200 centigrade.