About Us

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.

We have been serving customers in many industrial fields with a broad range of high quality heat-shrinkable products. The Company has been increasing its capacity for customer service with the team work of sales, engineering and production.


SEIP’s headquarters in San Marcos, California


Explore the Sumitomo Electric Company’s fascinating 400-year old history and discover how the company’s spirit of innovation and its extensive range of technology and products contribute to industry and society today.

Who We Are

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.

SEIP produces, markets, and sells products based upon heat-shrinkable plastics technology. We supply products 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.

SEIP has been serving customers in many industrial fields with a broad range of high quality heat-shrinkable products. The Company has been increasing its capacity for customer service with the team work of sales, engineering and production.

Our Values

  • CUSTOMER-FOCUSED
    We continuously strive to provide security and achieve customer satisfaction.

  • INTEGRITY
    We are sincere, kind, fair and just in all our dealings with everyone.

  • TEAMWORK
    We achieve mutual growth by respecting one another’s individuality and opinions, and by sharing knowledge and ideas.

  • INNOVATION
    We listen to our stakeholders and continuously seek ways to improve our work and business.

  • PROFESSIONALISM
    We make sustained efforts to improve our skills and proficiency so that we can provide high quality services.

Our Mission

Sumitomo Corporation Group’s Management Principles are a contemporary translation of Sumitomo’s Business Philosophy, which was devised 400 years ago, using simplified language and a clear structure, and rewritten from a more global perspective. The Activity Guidelines provide guidance on how each company as well as their executives and employees should behave as they conduct daily business activities to realize the Management Principles.

As declared in the Management Principles, our corporate mission is to support our shareholders, clients, local communities, employees, and everyone else around the world in their endeavors to achieve economic and spiritual prosperity and realize their dreams through our sound business activities. We also maintain throughout our business practices a unique management style that respects the personality of each individual and places prime importance on integrity and sound management, which represent the essence of Sumitomo’s Business Philosophy, while cherishing a corporate culture that allows each employee to take the initiative and demonstrate creativity that is conductive to continuous reform and innovation.

By sharing the values presented in the Management Principles and the Activity Guidelines across the Group to materialize them in specific business activities, we aim to be a global organization that constantly stays a step ahead in dealing with change, creates new value, and contributes broadly to society.

Our Quality

We realize quality products are the foundation of any successful business. From manufacturing to shipping, Sumitomo Electric Interconnect Products Inc. submits our products to numerous points of quality control, all to ensure our customers get the highest quality available and the correct products the first time.

Our Focus

It is the Environmental Policy of Sumitomo Electric Interconnect Products Inc. to continually improve on the Environmental Prevention of hazards through monitoring objectives and targets of predetermined aspects and pollutants while complying with the relevant Environmental Legislation, Regulations and Requirements.

Our History

Since 1996  Sumitomo Electric  Interconnect Products Inc. has been  manufacturing high quality products based upon heat shrink tubing plastics technology. Although independent, SEIP, Inc. is a wholly owned subsidiary of Sumitomo Electric U.S.A. Holding Company, which was established in 1964. As part of a global business, SEIP, Inc. manufacturers product at 5 locations, thus also allowing for proper load balancing to meet customer demand. During the ensuing years and over various locations, we estimate producing over 100 million miles of tubing.

Our long history demonstrates an outstanding track record of innovation, problem solving and product development. Our core global client base includes national defense, commercial aerospace, mass transit, telecommunications, consumer electronics, power generation and medical.

When you choose Sumitomo Electric Interconnect Products Inc. for your application needs, you are working with a team of people dedicated to providing you the highest value, when considering quality, price, delivery and service.

To find out more about Sumitomo Electric Interconnect Products Inc.’s commitment to you, please visit the pages below.

Corporate Governance

SEI’s Code of Conduct states the Company’s expectations that its employees conduct business in accordance with the Sumitomo Spirit and high ethical standards. We are committed to integrity and ethical business practices as we conduct business worldwide.

For a copy of the Company’s Code of Conduct, please click here for PDF.

The Company encourages employees and third parties to seek guidance or to report suspected violations of the Code, and the Company provides several avenues for reporting. One example is SEI’s Hotline, which allows for anonymous, confidential reporting maintained by an independent third party, Navex Global. For more information on the Company’s Hotline, please visit SEI’s website: http://sei.ethicspoint.com.

Sumitomo Electric Industries Ltd. (SEI)

Since its founding in 1897, Sumitomo Electric Industries Ltd., has become one of the world’s leading forces in the research and development of leading-edge, high-technology products and systems.
The accumulation of many years of technological expertise, in conjunction with a progressive research and development policy, forms the foundation of Sumitomo Electric’s developmental progress in optoelectronics, new materials and electronically based systems.

Sumitomo Electric Fine Polymer Inc. (SFP)

Sumitomo Electric Fine Polymer Inc., is a leading manufacturer of heat-shrinkable tubing, located near Osaka, Japan. In the rapidly evolving industrial fields, the demand is growing for more complex and advanced heat-shrinkable products.
To meet today’s increasingly sophisticated needs, Sumitomo Electric Fine Polymer Inc. is aggressively expanding the global scope of its operations through production facilities in Germany, Taiwan, China and the United States.



HOW CAN WE HELP?

For any information please Contact Us

Sumitomo Electric Interconnect Products, Inc.
915 Armorlite Drive, San Marcos, CA 92069

T: (760) 761.0600 info@seipusa.com

World leaders in identification
and heat-shrink technology

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