About Us

A Message from Our President & CEO

Built on Experience. Driven by Purpose.

My journey to becoming a CEO was far from conventional.

As a young man, I faced life-changing challenges that forced me to reconsider my future and rebuild my life from the ground up. Those early experiences taught me the importance of perseverance, personal responsibility, and the value of a second chance. More importantly, they gave me a determination to create a better future through hard work, education, and opportunity.

My professional journey began on January 13, 2003, in the rubber manufacturing industry, where I started in sales and learned the business from the ground up. While working long hours and pursuing my college education, I developed a passion for international business, manufacturing, and building lasting customer relationships.

Over the years, I had the privilege of working with manufacturers across Asia, developing global supply relationships, and supporting customers throughout North America. What began as a career in sales evolved into a lifelong commitment to understanding the complexities of manufacturing, engineering, and international commerce.

COi Rubber Products manufacturing facility in Wuhu, China

In 2011, we built Wuhu COi Rubber Products from the ground up: our own factory in Wuhu, China, about 200,000 square feet, with all of our rubber compounding and production under one roof. I am proud of what our team has built there.

In 2013, I became President and CEO of COi Rubber Products, bringing together years of industry experience, international manufacturing relationships, and a vision for building a company centered on quality, integrity, and long-term partnerships.

Throughout my career, I’ve learned that successful business relationships are built on more than competitive pricing or manufacturing capabilities. They require trust, accountability, consistent execution, and a genuine commitment to understanding the needs of others.

Today, COi Rubber Products reflects those principles. We combine global manufacturing capabilities with the responsiveness, flexibility, and personal attention of a privately owned American company. Our goal is not simply to supply components, but to become a dependable manufacturing partner that our customers can rely on for years to come.

As I’ve grown both personally and professionally, my definition of success has also evolved.

Early in my career, success meant growth, achievement, and constantly pursuing the next opportunity. Today, I believe true success is measured by the relationships we build, the opportunities we create for others, the commitments we honor, and the positive impact we leave behind.

I’m proud of what we’ve accomplished at COi Rubber Products, but I’m even more grateful for the employees, customers, manufacturing partners, and family members who have contributed to this journey.

My story has taught me that where we begin does not have to determine where we finish. With perseverance, integrity, and a willingness to keep learning, extraordinary things are possible.

Thank you for taking the time to learn about our company and the journey behind it. We look forward to the opportunity to earn your trust and your business.

David Chao signature

David Chao
President & CEO
COi Rubber Products, Inc.

Executive Leadership

Napoleon Castillo – Vice President of Sales

Napoleon Castillo joined COi Rubber in 2017 as an account manager, was promoted to sales manager in 2019, and has served as Vice President of Sales since 2024. He leads the company’s sales team and new customer outreach across the automotive and industrial markets.

Read: COi Rubber Recognizes Napoleon Castillo for Nearly a Decade of Service

About COi Rubber Products

COi Rubber Products, Inc. is a US owned and operated supplier of custom-engineered rubber, plastic and industrial components for OEMs. We have been in business since 2003, more than 23 years. In addition, we help customers go from design input and material selection to prototyping, tooling and high-volume production, with a US team that coordinates engineering, quality and supply.

Manufacturing capabilities at COi Rubber Products

  • Custom rubber compounding and material development
  • Compression, injection and transfer molding
  • Rubber-to-metal bonding and insert molding
  • Rubber and plastic extrusion
  • Plastic injection molding and metal stamping
  • Prototyping, production tooling and engineering support
  • Testing and high-volume production

In 2011 we built our own Wuhu, China factory from the ground up, with rubber compounding and production under one roof. Our Wuhu, China manufacturing network and testing laboratories cover approximately 200,000 square feet. Our Wuhu, China manufacturing facility is IATF 16949 certified, and COi Rubber Products holds MBE certification. See all of our capabilities and our facilities.

Growing in Southern California

In 2025 we moved our headquarters to Diamond Bar, California, and were recognized by the Diamond Bar City Council. We bought our Pomona sales office and warehouse, an investment in our community that puts us closer to the customers we serve. We also utilize a 25-dock distribution warehouse in Mira Loma. When a customer’s demand surges, it gives us the capacity to receive, stage and ship large container volumes quickly, so orders keep moving. We are a US owned and operated company, and we are proud to keep growing here at home.

COi Rubber Products engineering that shows in the part

Good manufacturing starts before production. That is why our technical work covers specialty elastomer formulations, noise and vibration control (NVH), natural rubber performance, electrical conductivity and insulation, and demanding rubber-to-metal bonding. Also, we work with you on material, design and manufacturability to improve part performance and control cost. Read more in Material Technology.

Industries COi Rubber Products serves

Automotive and transportation, agriculture and heavy equipment, industrial machinery, HVAC and appliances, food processing equipment, and consumer and specialty products.

A COi Rubber Products partnership built on long-term value

Price matters. So do consistent quality, clear communication and dependable delivery. Because we are privately held and family-owned, we stay accountable to every customer.

New product, a better price on an existing part, or a second source you can count on: send your drawings or requirements to estimator@coirubber.com or use our contact page, and an engineer will respond.

COi Rubber Products Mission Statement

“To be a trusted manufacturing partner, delivering engineered rubber and plastic solutions with technical depth, consistent quality, competitive value and dependable service.”

Our Address

Corporate Headquarters

1370 Valley Vista Dr Suite 200
Gateway Corporate Center
Diamond Bar, CA 91765

sales@CoiRubber.com

(626) 965-9966

Meet our leadership team

Meet the people supporting COi Rubber customers across sales, finance, production and quality control.

Leadership & Team

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