Shanghai kejian Chemical Co., Ltd located in the southeast of Shanghai China and covers an area of 12,000 m2,and it is oriented to devote itself to the research and development of new and high technology products, with good developing ability and advanced techniques, Kejian produces all kinds of water-proof butyl tape and related sealant for car industry, FRP industry, communication industry, building industry and so on.. we now have got 6 invent