What are the opening hours?

Monday 8:30am - 5:30pm Tuesday 8:30am - 5:30pm Wednesday 8:30am - 5:30pm Thursday 8:30am - 5:30pm Friday 8:30am - 5:30pm

Coi Rubber Products

Name: Coi Rubber Products
Address: 1370 Valley Vista Drive Suite 200, Diamond Bar, CA, 91765, US
Telephone: +16269659966

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Diamond Bar, CA
Coi Rubber Products

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Rubber & Plastics - Injection Molding, Compression, Transfer, Vacuum Molding/Forming, Rubber-to-Meta Find out more about us by calling today!

Coi Rubber Products was established to service the Rubber & Plastics Industry. We started in molded products serving the agriculture industry. Since then, we have expanded into a variety of rubber products which includes molding, extrusion, and rubber to metal bonding. We serve a wide variety of companies in different industries, some industries include the Automotive, Industrial, Food Processing, HVAC, Appliance and others. We offer injection molded rubber, or any custom rubber or plastic products. We offer competitive pricing, fast lead time, and US local customer and engineering service.

10/30/2026

COi Rubber Products is looking for independent sales reps. Competitive commission, non-exclusive, on new accounts you bring us. Email [email protected]

10/21/2026

COi Rubber Products is proud to recognize Vice President of Sales Napoleon Castillo for nearly a decade of service. Napoleon joined us in 2017 as an account manager, became sales manager in 2019, and has led our sales team as VP of Sales since 2024, supporting customers across automotive and industrial markets from APQP through ASTM specifications and testing. Read the full announcement: https://coirubber.com/coi-rubber-recognizes-napoleon-castillo-for-nearly-a-decade-of-service/

10/19/2026

Custom molded rubber, built to your print. Compression molding, extrusion and rubber-to-metal bonding for automotive, HVAC, appliance and industrial customers. Send us a drawing and we will tell you what is possible.

10/17/2026

Will your rubber seal survive oil? ASTM D471 helps you ask the right questions. It is the standard test for how rubber compounds hold up in oils, fuels and other fluids - so the material you pick matches the fluid it actually sees.

Learn more: https://coirubber.com/astm/astm-d471-liquid-test/

Full video: https://www.youtube.com/watch?v=vA-Qp-khjaU

What happens to rubber seals, gaskets and hoses when they contact o...

10/17/2026

Full video: https://www.youtube.com/watch?v=vA-Qp-khjaU

11/05/2025

The secret to cost-effective plastic component manufacturing? It's all in the design and material advancement.

At Coi Rubber Products, we combine advanced R&D with precise injection and compression molding techniques to deliver high-quality, affordable parts. This means less waste, faster production, and parts tailored perfectly to your needs.

Ready to cut costs without sacrificing quality? Let's engineer your next solution together.

Address

1370 Valley Vista Drive Suite 200
Diamond Bar, CA
91765

Opening Hours

Monday	8:30am - 5:30pm
Tuesday	8:30am - 5:30pm
Wednesday	8:30am - 5:30pm
Thursday	8:30am - 5:30pm
Friday	8:30am - 5:30pm

Telephone

+16269659966

Website

http://www.coirubber.com/, https://www.youtube.com/@CoirubberUSA

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