Sumitomo Electric Sumitube is a heat shrink tubing that takes advantage of the shape-memory effect of plastics enhanced by electron beam irradiation.

Since the Company's founding in 1897, Sumitomo Electric Industries, Ltd. has continued to take on challenges to achieve a prosperous and dream-filled future. In late 19th century, Japan was still heavily dependent on expensive imported electric cables. Sumitomo Electric decided to break ground with the electric wire business for the benefit of the nation. Starting with the production of copper and silicon copper wires, the Company played an important role in supporting the development of Japanese industries, succeeding in the first domestic production of high-voltage underground cables and the production and installation of the world's longest submarine cables. 120 years have passed since then. With its belief in the great potential of "innovation," the Sumitomo Electric Group will continue to contribute to the development of Japan and the world, both today and in the future.