What Coi Rubber Products does

Coi Rubber Products is a US-owned custom manufacturer of molded rubber and plastic components, founded in 2013 by David C. Chao (formerly VP of Sales at Lusida Rubber Products) and headquartered in Diamond Bar, California. The company produces compression-molded, transfer-molded, and injection-molded rubber parts, rubber-to-metal bonded assemblies, plastic injection/extrusion/thermoformed parts, rubber extrusions (solid, sponge, and dual durometer), metal stampings, fabric-reinforced hoses, and a range of secondary converting services (die cutting, laser cutting, CNC knife cutting, laminating/coatings). Its primary manufacturing footprint is a 250,000 sq. ft. facility in Anhui Wuhu, China, with an additional 1.4 million sq. ft. of capacity accessible through partner plants, while US distribution is handled from warehouses in Pomona and Mira Loma, California. In-house material compounding (including FKM, UL 157, FDA, and conductive/non-conductive compounds), an in-house CNC tooling department, and an R&D lab at the China site (with US-side testing supported by Akron Rubber Development Laboratory) give the company end-to-end control from formulation to finished part. The company holds IATF 16949:2016 and ISO 9001:2015 certifications, plus US Minority Business Enterprise (MBE) status, and serves OEMs across automotive, industrial, appliance, heavy trucking, agriculture, medical, and HVAC end markets.

The business model is B2B custom manufacturing sold on a quote-based, multi-year contract basis. Customers submit specifications and RFQs through the company website, direct phone, or email, and pricing is determined per part based on material, tooling, and volume rather than published lists. Lead generation is sales-led, supported by US-based engineering and customer service, content marketing (blog, social), and earned media in Rubber & Plastics News. Logistics involve regular 40-foot container shipments from China to the US, with California warehouses serving as inventory and fulfillment points for North American customers. The company is privately held by the Chao family, with no disclosed external institutional funding and no public revenue figures, though it is established and operating with a workforce of 251-500 (450 at the China facility alone, up from 150 at founding).

Name

Coi Rubber Products

Legal name

Coi Rubber Products, Inc.

Website

https://coirubber.com

Company type

Private

Founded year

2013

Operating status

Operating

Headcount range

251–500 employees

Short description

Coi Rubber Products is a US-owned custom manufacturer of molded rubber and plastic components, operating a 250,000 sq. ft. China factory plus US distribution. It serves automotive, industrial, appliance, HVAC, agriculture, and medical OEMs with IATF-certified, quote-based custom manufacturing.

Ownership category

akta.pro rank

Product category

Custom Molded Rubber and Plastic Components

NAICS

Rubber Product Manufacturing for Mechanical Use (326291), Plastics Product Manufacturing (3261), Other Rubber Product Manufacturing (32629)

SIC

Fabricated Rubber Products, Nec (3060), Plastics Products, Nec (3089), Plastic Material, Synth Resin/Rubber, Cellulos (No Glass) (2820)

akta.pro primary industry

Molded & Extruded Industrial Rubber Parts (Custom Components) (IMANALAG)

akta.pro secondary industry

Food-Grade, Medical & Cleanroom Rubber Compounds (IMANAJAH)

Keywords

• Custom molded rubber
• Plastic injection molding
• Rubber to metal bonding
• Rubber extrusion products
• Automotive rubber components

Headquarters

HQ city

City Of Industry

HQ country

United States

HQ region

North America

Offices4 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Personnel, Operations, Infrastructure, Marketing or Sales, Technology or R&D

Revenue model

1. Custom Molded Rubber Products: The company manufactures custom molded rubber products using compression, injection, and transfer molding techniques. Products are sold to OEMs and industrial customers requiring high quality rubber components meeting automotive and other industry specifications.
2. Plastic Products Manufacturing: Plastic injection, extrusion, and thermoforming services for custom parts across multiple industries including automotive, appliance, HVAC, and industrial.
3. Rubber Extrusion Products: Solid rubber extrusion, sponge rubber extrusions, and dual durometer rubber extrusions manufactured in-house with custom compounds.
4. Rubber to Metal Bonding: Rubber-to-metal bonded products combining rubber and metal components for enhanced durability and performance in demanding applications.

Pricing tiers

Go-to-market motion1 record

Distribution channels4 records

Marketing channels6 records

Core offering

Coi Rubber Products is a custom contract manufacturer of molded rubber and plastic components for B2B OEM and industrial customers. The company produces parts via compression, transfer, and injection molding of rubber and plastic, rubber-to-metal bonding, plastic injection, extrusion, and thermoforming, rubber extrusion (solid, sponge, and dual durometer), metal stamping, fabric-reinforced hoses, die cutting, laser cutting, laminating and coatings, and CNC knife cutting and slitting, with in-house compounding, CNC tooling, and R&D supporting every order.

Product overview

Coi Rubber Products is a custom manufacturer of rubber and plastic products offering a comprehensive portfolio of manufacturing capabilities. The core offerings include custom molded rubber products utilizing compression, transfer, and injection molding processes, along with rubber-to-metal bonding services. The company also provides plastic products through injection, extrusion, and thermoforming processes. Additional capabilities include metal stamping, rubber extrusion (solid, sponge, and dual durometer), fabric-reinforced hoses, die cutting, laser cutting, laminating and coatings, and CNC knife cutting and slitting. The company operates manufacturing facilities in both the USA and China, serving industries including automotive, industrial components, appliance, heavy trucking, agriculture, medical, and HVAC. They provide in-house material compounding, tooling, and R&D capabilities to support their manufacturing operations.

Differentiator

Problem solved

Functional benefit

Products and services

• Custom Molded Rubber Custom molded rubber products manufactured via compression, transfer, and injection molding to client specifications, sold to OEM and industrial customers across automotive, industrial, appliance, heavy trucking, agriculture, medical, and HVAC sectors.
• Compression Molding Rubber Rubber compression molding services that produce custom rubber parts with cost-effective tooling options for industrial and OEM customers.
• Transfer Molding Rubber Rubber transfer molding services that offer better control over material flow and part quality for custom rubber products.
• Injection Molding Rubber Rubber injection molding for high-volume production of precision rubber parts with consistent quality, serving automotive and industrial customers.
• Rubber to Metal Bonding Bonded rubber-to-metal components that combine rubber and metal substrates into integrated assemblies for automotive and industrial applications.
• Plastic Injection Molding Custom plastic injection molding services that produce precision plastic components for automotive, industrial, appliance, and HVAC applications.
• Plastic Extrusion Plastic extrusion services that produce continuous plastic profiles and shapes for industrial and OEM customers.
• Plastic Thermoforming Plastic thermoforming services that use heat and pressure to create custom plastic parts for OEM and industrial customers.
• Metal Stamping Metal stamping services that produce metal components and stamped parts for industrial and automotive customers.
• Solid Rubber Extrusion Extrusion of solid rubber profiles used for seals, gaskets, and custom rubber shapes manufactured with in-house custom compounds.
• Sponge Rubber Extrusions Sponge (cellular) rubber extrusions produced for cushioning and sealing applications, using custom rubber compounds.
• Dual Durometer Rubber Extrusions Rubber extrusions with two different hardness levels bonded together to provide versatile sealing solutions for industrial and OEM customers.
• Fabric Reinforced Hoses Custom fabric-reinforced rubber hoses designed for fluid transfer applications in industrial and OEM settings.
• Die Cutting Die cutting services that provide precision cutting of rubber and plastic materials into custom shapes for OEM and industrial customers.
• Laser Cutting Laser cutting services for precise cutting of rubber and plastic materials, sold to OEM and industrial customers.
• Laminating and Coatings Lamination and coating services applied to rubber and plastic products to enhance functionality for industrial and OEM customers.
• CNC Knife Cutting and Slitting CNC-controlled knife cutting and slitting services for precise material processing of rubber and plastic materials, sold to industrial and OEM customers.

Quantifiable outcome

• Reliable product and delivery guarantee
• +2 more outcomes

Named customers5 records

Segments8 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

Three partnerships are on record, tiered minor and core.

• Lear CorporationminorStrategic or Co-development PartnerLear Corporation's facility is located two blocks away from Coi Rubber's Anhui Wuhu manufacturing plant in China, suggesting a close geographic and potentially operational relationship. Coi Rubber appears to benefit from proximity to a major automotive seating systems manufacturer.
• Partner Manufacturing Companies in ChinacoreStrategic or Co-development PartnerCo-founder David Chao has financial interests in some partner manufacturing companies in China. These partner companies have helped shoulder some of the production workload during the construction stage of the new plant. When including partner plants, the company has over 1.4 million sq. ft. of manufacturing power.
• Alex Horng (Silent Partner/Co-founder)coreStrategic or Co-development PartnerAlex Horng, founder of a successful durable medical equipment business headquartered at the same Los Angeles facility as Coi Rubber, co-founded the company with David C. Chao in 2013.

Scale indicators5 records

Recent moves9 records

Expansion highlights5 records

Direct peers

• Custom Rubber Corp. Custom molded rubber and extruded rubber products manufacturer serving industrial and OEM customers. Comparable offering across compression molding, transfer molding, extrusion, and rubber-to-metal bonding.
• Lusida Rubber Products: Custom molded rubber manufacturer serving automotive and industrial markets. Directly comparable as Coi founder David Chao served as VP of Sales at Lusida before founding Coi, indicating very similar product capabilities and customer overlap.
• Minnesota Rubber and Plastics: Custom molded rubber and plastic component manufacturer serving medical, industrial, and automotive markets with engineered materials. Comparable in compound development, custom molding, and regulated-industry certifications, though at larger scale.
• Howard Rubber & Manufacturing: Custom molded rubber products manufacturer providing compression and transfer molded rubber components for OEM customers. Comparable in custom molded rubber offerings to industrial and automotive end markets.
• VIP Rubber: Custom molded rubber manufacturer offering compression, transfer, and injection molding with in-house compounding. Highly comparable to Coi Rubber in product mix, customer base (automotive/industrial), and engineering-driven sales model; Coi even references VIP Rubber's RMA tolerance tables on its own engineering site.
• Polycorp Ltd. Manufacturer of engineered polymer products including custom molded rubber and rubber-to-metal bonded components for industrial, transportation, and infrastructure. Comparable in molded rubber, rubber-to-metal bonding, and engineered compound capabilities.

Broad incumbents

• Parker Hannifin: Diversified motion and control technologies manufacturer with a substantial sealing and engineered materials division. Overlaps with Coi on rubber seals, gaskets, and molded elastomer components across industrial and automotive customers.
• Trelleborg Sealing Solutions: Global engineered polymer solutions provider of seals, vibration dampers, and custom rubber components. Direct overlap with Coi's molded rubber and rubber-to-metal bonded parts serving transportation and industrial OEMs, but with global footprint and brand.
• Freudenberg Sealing Technologies: Global Tier 1 supplier of seals, gaskets, and custom elastomer components for automotive and industrial markets. Competes in the same end applications as Coi but with vastly broader scale, multi-region manufacturing, and global OEM contracts.

Others

• Akron Rubber Development Laboratory: Independent rubber testing, compound development, and consulting laboratory. Comparable in adjacent value chain role — Coi is an explicit customer and partner, and ARDL represents the upstream technical services tier that custom rubber manufacturers either build in-house (as Coi has with its R&D lab) or outsource.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• YouTubeyoutube.com/@CoirubberUSA
• Facebookfacebook.com/CoiRubber
• LinkedInlinkedin.com/company/coi-rubber-products
• Xx.com/CoiRubber

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles4 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Coi Rubber Products