Press Releases

OKI Launches Stretchable Flexible Printed Circuits ("Stretchable FPC")

The product accommodates complex movements, including the movements of the human body

New product: Stretchable FPC
New product: Stretchable FPC

TOKYO, June 14, 2019 -- Oki Electric Cable Co., Ltd., an OKI Group company specializing in electric cables, today announced the launch of its Stretchable Flexible Printed Circuits,(*1) "Stretchable FPC." The product is part of the new Oki Electric Cable product lineup to be introduced in June 2019.

The astonishing technological advances and the growing sophistication of electronic devices in recent years have generated demand for new characteristics in the flexible printed circuits (FPCs) used as wiring materials.

The requirements for wiring materials found in clothing-type wearable devices include the ability to mount functional parts, in addition to light weight, thin profile, and the flexibility needed to ensure comfort when worn. Furthermore, these materials must offer the elasticity needed to accommodate the various movements of the human body. Existing FPCs offer light weight, thin profile, flexibility, and mountability, but lack elasticity.

The newly launched Stretchable FPC offers elasticity by replacing the polyimide(*2) widely used in existing FPCs with an elastic substrate. This elastic substrate can be stretched repeatedly, like rubber, and is heat-resistant, allowing components to be solder-mounted. Its circuit conductor incorporates the same copper wiring as existing FPCs but the wiring method is specially designed to allow it to work with the stretchable substrate. The use of copper wiring minimizes variations in conductor resistance due to FPC expansion or contraction, allowing use of the FPC as a sensor. Potential applications for the Stretchable FPC include use as a wearable sensor to help diagnose disease in the chest; the Stretchable FPC is wrapped around the chest to measure signal fluctuations in the copper wiring.

By combining elasticity with the existing characteristics of FPCs, the Stretchable FPC can be used as elastic wiring material in wearable devices and will contribute to the ever-growing sophistication of electronic devices. Oki Electric Cable will continue to proactively develop new products to meet constantly diversifying customer needs.

Sales schedule

June 2019
Sales target
100+ million yen in fiscal 2020


  • *1 :Flexible printed circuits (FPCs)

    Thin, flexible circuit boards that offer performance free of variations in electrical characteristics even when bent

  • *2 :Polyimide

    A type of engineering plastic characterized by a rigid, robust molecular structure; has the highest levels of thermal, mechanical, and chemical properties among polymers; widely used as an insulating substrate in FPCs

  • OKI Electric Industry Co., Ltd. and OKI Electric Cable Co., Ltd. are referred to as "OKI" and "OKI Electric Cable" in this document, respectively.
  • The names of the companies and products mentioned in this document are the trademarks or registered trademarks of the respective companies and organizations.
Press Contact:
Oki Electric Cable Co., Ltd.
Corporate Planning Office
Phone: +81-44-754-4369
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  • * Information in the press releases is current on the date of the press announcement, but is subject to change without prior notice.

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