Engineering Sealing Solutions That Keep Industries Moving

Founded in 1989, Functional Oil Seal Industrial Co., Ltd. (FOS 逢成工業股份有限公司) is a Taiwan-based manufacturer specializing in high-performance oil seals and precision rubber-to-metal sealing components.

Over the years, we have built our expertise around one clear purpose: to develop sealing solutions that perform reliably under real operating conditions. By combining proven manufacturing experience with continuous engineering development, FOS supports customers in overcoming challenges involving pressure, temperature, friction, wear, media compatibility and service life.
 

Integrated Manufacturing. Consistent Quality.

Our vertically integrated manufacturing system covers the critical stages of oil seal production, including:

• Metal stamping
• Surface treatment and adhesive application
• NBR and FKM rubber compounding
• Compression molding and vulcanization
• Seal profile finishing
• Garter spring assembly
• Inspection and performance verification

By controlling these processes in-house, we can respond rapidly to new projects, maintain consistent production quality and provide dependable support from initial development to mass production.
 

More Than Manufacturing

FOS is not simply a producer of standard oil seals. Our capabilities extend to material development, product and tooling design, process optimization, failure analysis and seal performance testing.

We work closely with customers to translate application requirements into practical and manufacturable solutions. Whether the objective is to develop a new seal, improve service life, resolve leakage or wear issues, or stabilize high-volume production, our engineering team approaches every project with technical discipline and a problem-solving mindset.
 

Quality Built into Every Process

Our management systems are certified to:

• IATF 16949:2016
• ISO 9001:2015
• ISO 14001:2015

These certifications reflect our commitment to automotive-grade process control, consistent product quality, continuous improvement and environmentally responsible manufacturing.
 

Your Partner in Sealing Innovation

As industries move toward higher speeds, greater efficiency and more demanding operating environments, sealing technology must continue to evolve.

FOS is committed to advancing beyond conventional oil seal manufacturing by developing higher-performance materials, specialized sealing structures and application-specific solutions for the next generation of industrial and mobility systems.

From concept to production, we combine materials, manufacturing and testing expertise to create sealing solutions our customers can trust.

FOS — We engineer confidence into every rotation.