With excellent electric properties, PEEK can be used as electrical insulator so that it can keep its properties under circumstances like high temperature, high pressure and high humidity. In this condition, electric has been the second largest field which PEEK is highly applied. PEEK reduces the pollution in the processing of silicon slice with its great mechanical properties and stable performance. And its high purity makes it possible to be used as pipe, valve and pump in ultrapure water system, which reduces the pollution greatly. As we know PEEK get higher heat deflection temperature, it is highly applied in semiconductor industry .