Long Beach, CA
1. Medway Plastics Corporation
Address: 2250 E Cherry Industrial Circle, Long Beach, CA 90805
Phone: (562) 630-1175
Website: https://medwayplastics.com/
Email: info@medwayplastics.com
Founded: 1974
Employees: Approximately 66
Facility: 26 injection molding presses in Long Beach; second facility in Round Rock, Texas
Services:
Custom plastic injection molding, engineering and design, research and development, material specialties, process capabilities, proprietary product development
Industries Served:
Automotive, food packaging, furniture, sporting goods, marine, medical devices
Certifications: Sustainable manufacturing practices, zero plastic waste to landfills
Highlight:
Family-owned company with 50+ years of experience operating a green co-generation system that generates electricity from natural gas, recovers heat for mold cooling, and provides backup power. Press fleet ranges from 60 to 1,000 tons. Known for proprietary products and patents developed through dedicated R&D efforts.
2. Bryant Rubber Corporation
Address: 1580 W. Carson Street, Long Beach, CA 90810
Phone: (310) 530-2530
Website: https://www.bryantrubber.com
Founded: 1971
Facility: 45,000 sq ft in Long Beach; 125,000 sq ft in Tijuana, Mexico
Services:
Compression molding, transfer molding, waste-less molding, injection molding, liquid injection molding (LSR), overmolding, automated production, vision inspection, clean room environments (Class 100,000/ISO 8), secondary operations, material science and compound development
Industries Served:
Medical devices, automotive, gas and fluid regulation, military/aerospace/civilian defense, general industry
Certifications: ISO 9001:2015, IATF 16949:2016, ISO 14001:2015
Highlight:
Over 50 years of rubber and elastomer molding expertise with patented SPAPS (Select Primerless Adhesion Polymer System) technology for cost-effective overmolded gaskets. Company operates under a “100 Year Dream” philosophy focused on long-term excellence rather than short-term profits. Cleanroom capabilities support medical device manufacturing.
3. R.S.K. Tool, Inc.
Located in Compton, CA, serving the Long Beach metro area
Address: 410 W Carob Street, Compton, CA 90220
Phone: (310) 537-3302
Website: https://www.rsktool.com/
Founded: 1979
Employees: Approximately 20
Services:
Plastic injection molding, plastic mold manufacturing, die-cast molds, custom tooling
Industries Served:
General manufacturing, industrial applications
Highlight:
Family-owned and operated business with over 40 years of manufacturing excellence in plastic and die-cast molds. Specializes in quality plastic injection molding with a focus on making products stand out through superior craftsmanship.
Oakland, CA
1. Plastikon Industries, Inc.
Headquartered in Hayward, CA, serving the Oakland/Bay Area market
Address: 687 Sandoval Way, Hayward, CA 94544
Phone: (510) 400-1010 / (888) 538-9374
Website: https://www.plastikon.com/
Email: info@plastikon.com
Founded: 1982
Employees: 1,300+ globally (approximately 377 at headquarters)
Facility: 12 worldwide facilities including Hayward CA (headquarters), Lawrence KS, Hong Kong, multiple China locations, Chihuahua Mexico
Services:
Plastic injection molding (10-3,000 ton capacity), prototyping and product development, injection mold design and tooling, engineering and design, blow/fill/seal aseptic filling, thermoforming, part decoration and assembly, clean room manufacturing, program management, warehouse logistics
Industries Served:
Healthcare, pharmaceutical, medical devices, automotive, electronics
Certifications: ISO 9001:2015, ISO 13485:2016, ISO 14001, FDA registered, MBE certified minority-owned business
Highlight:
Global leader in medical device and pharmaceutical plastic manufacturing with 40+ years experience. Recognized as a Toyota Select Supplier applying TPS principles including Kaizen, 5S, and lean manufacturing. Comprehensive capabilities from design through contract manufacturing with facilities spanning three continents.
2. Westec Plastics Corporation
Located in Livermore, CA, serving the Oakland/Bay Area market
Address: 6757 Las Positas Road, Livermore, CA 94551
Phone: (925) 454-3400
Website: https://www.westecplastics.com/
Founded: 1969
Services:
Plastic injection molding, mold building, 3D printed injection mold tooling, clean room capabilities, secondary operations
Industries Served:
Medical (specialty), aerospace and defense, consumer products, electronics, sports/recreation/entertainment, baby care, veterinary
Certifications: ISO 13485:2016
Highlight:
Family-owned business specializing in medical injection molding with clean room capabilities for over 55 years. Known for responsive service, honest mold design advice, and collaborative approach. Customers praise their down-to-earth team and family business feel combined with well-rounded quality, processing, and competitive pricing.
3. JATCO Incorporated
Located in Modesto, CA (formerly Bay Area), serving Oakland and Northern California
Address: 4801 Stoddard Road, Modesto, CA 95356
Phone: (209) 497-4297
Website: https://www.jatco.com/
Founded: 1976
Facility: 102,000+ sq ft on 5+ acres with rail access
Services:
Custom plastic injection molding, tooling, clean room injection molding, engineering, die casting, metal stamping, assembly, painting, packaging, warehousing, distribution, import/export services
Industries Served:
Healthcare, consumer products, construction, technology (clients include Tesla, VELUX, SONY, Life Technologies)
Certifications: ANAB certified
Highlight:
Over 50 years of plastic molding experience operating as a full-service “one-stop shop” 24/7 on two continents. With 30+ molding machines including a 720-ton two-component press, proximity to Port of Oakland enables global distribution capabilities. Known as the American firm that helps companies bring manufacturing back from overseas.
Minneapolis, MN
1. Steinwall, Inc.
Located in Coon Rapids, MN, serving the Minneapolis/Twin Cities metro area
Address: 1759 116th Avenue NE, Coon Rapids, MN 55448
Phone: (763) 767-7060 / (800) 229-9199
Website: https://steinwall.com/
Founded: 1965
Facility: Nearly 250,000 sq ft of production and warehouse capacity
Services:
Engineering and design, tooling, plastic injection molding (30-1,100 ton capacity), assembly and secondary operations, warehouse and distribution
Industries Served:
Agricultural, industrial, lawn and garden, appliances, computers, consumer goods, utility and energy, construction, electrical
Certifications: ISO 9001:2015, WBENC certified women-owned business
Highlight:
Celebrating 60 years as a recognized leader in thermoplastic injection molding. Named one of the 2025 Best Places to Work in the Plastics Industry. Major clients include John Deere, Bosch, Caterpillar, Honeywell, and Emerson. Women-owned business operating under the philosophy “Reliable parts. Reliable People.”
2. REO Plastics, Inc.
Located in Maple Grove, MN, serving the Minneapolis/Twin Cities metro area
Address: 11850 93rd Ave. N, Maple Grove, MN 55369
Phone: (763) 425-4171
Website: https://www.reoplastics.com/
Email: info@reoplastics.com
Founded: Approximately 1970 (55+ years in business)
Services:
Plastic injection molding, custom plastic molding, plastic machining, material decoration, stocking/fulfillment services, toolroom services, mold maintenance
Industries Served:
Multiple markets including manufacturing, consumer goods, industrial applications
Certifications: ISO 9001:2015, UL certified
Highlight:
Twin Cities plastic injection molding company committed to quality, service, and productivity. Known for flexible, end-to-end plastic injection services with advanced automation equipment. Customer testimonials highlight their responsiveness, consistency, and treatment of all clients equally regardless of company size.
3. Aprios Custom Manufacturing
Formerly Diversified Plastics, Inc. Located in Brooklyn Park, MN, serving the Minneapolis/Twin Cities metro area
Address: 8617 Xylon Court, Brooklyn Park, MN 55445
Phone: (763) 297-2613 / (763) 424-2525
Website: https://www.aprios.com/
Email: sales@aprios.com
Founded: 1976 (48+ years in business)
Employees: Employee-owned
Facility: Two locations: Minneapolis, MN (Aprios North) and Vista, CA (Aprios West)
Services:
Design for manufacturing, additive manufacturing (Carbon 3D technology), tooling, injection molding (15-610 ton capacity), quality management, clean room/white room manufacturing, secondary operations, supply chain strategy
Industries Served:
Medical devices, industrial applications, B2B mission-critical devices
Certifications: ISO 9001, ISO 13485, ITAR, UL Blue, FDA registered
Highlight:
Employee-owned company with 48+ years delivering complex plastic parts for mission-critical B2B devices. Located in Medical Alley (Minneapolis), the company specializes in medical device manufacturing with clean room capabilities. 100% manufactured in the USA with expertise in helping companies reshore manufacturing operations. Offers rapid prototyping with tooling to finished parts in as little as three weeks.
Notes
Research across these three cities reveals distinct regional specializations in the plastic injection molding industry. Long Beach and the broader Los Angeles metro area feature companies with strong automotive and rubber/elastomer capabilities, with Bryant Rubber’s patented bonding technologies and Medway’s sustainable manufacturing practices standing out. The Oakland/Bay Area region demonstrates concentration in medical device and pharmaceutical manufacturing, with Plastikon’s global reach and Westec’s specialized medical molding expertise reflecting Silicon Valley’s healthcare technology ecosystem.
Minneapolis and the Twin Cities area show strength in industrial, agricultural, and consumer goods manufacturing, with Steinwall’s relationships with major agricultural equipment manufacturers and Aprios’s medical device focus representing the region’s diverse manufacturing base. Women-owned and employee-owned business structures appear more prominently in the Midwest, potentially reflecting different regional business cultures.
Companies serving medical industries consistently maintain ISO 13485 certification and FDA registration, while automotive suppliers hold IATF 16949 certification. Press capacities range widely from 15 tons for micro-molding applications to 3,000 tons for large-scale production, indicating the diversity of part sizes and volumes these manufacturers can accommodate.
Research conducted January 2026. Verify all information directly with companies before business engagement.