Sumitomo Electric Interconnect Products Inc. is a leading manufacturer, seller and servicer of heat-shrinkable products worldwide. We supply product to a diverse range of customers in a variety of industries. These include the automotive, aerospace, appliance, communications, electronics, medical, and transit industries to name a few.

Sumitomo Electric Interconnect Products Inc. (SEIP) was founded in 1985 as a sales and marketing company. The company was originally formed to sell products made by Sumitomo Electric Industries, Ltd. in Japan to North American customers.

SEIP is an independent U.S. company and is wholly owned subsidiary of Sumitomo Electric U.S.A. Holding Company. In 1996, SEIP began US production by building a new manufacturing site in San Marcos, CA.