More About Westec Plastics

High Precision Plastic Injection Molding in California

Westec Plastics is a high precision plastic injection molding company in California, providing custom injection molded plastic parts and full service manufacturing from our Livermore, CA injection molding facility. We operate as a full service manufacturing partner, helping customers move from concept through production with a focus on quality, speed, and long term reliability.

Since 1969, Westec Plastics Corporation has set the standard for the custom plastic injection molding industry. We specialize in tight tolerance mold manufacturing and production. Quality and customer service are our top priority and 100% customer satisfaction is our goal. Our dedication to both quality and our customers is why Westec Plastics is a leading U.S. injection molding company.

Custom Injection Molded Plastic Parts & Manufacturing Capabilities

Westec’s engineering design team can take your project from concept to production by supporting customers with design for manufacturability and mold flow analysis. Our full service tool room supports mold design, prototypes, and mold manufacturing.

To accelerate timelines, we leverage advanced tooling technologies, including 3D printed steel tooling, to support faster iteration, bridge tooling, and reduced lead times from prototype to production.

Injection Molding Facility in California with Advanced Capabilities

Our 23 state of the art injection molding machines range in size from 28 to 610 tons, including three two-shot injection molding machines, all of which are integrated into our Real Time Monitoring System. This allows us to track mold performance and efficiency during production.

ISO Class 8 clean room facilities are also available to support regulated industries, including medical and biotech applications that require controlled manufacturing environments.

Built for Precision, Quality, and Production Control

Our quality and inspection processes are integrated throughout production, utilizing advanced metrology equipment, CMM measurement systems, and statistical process control (SPC) to maintain tight tolerances and ensure part consistency.

With a combination of in-house capabilities and long standing domestic and offshore tooling partnerships, we help customers reduce supply chain risk while maintaining quality, flexibility, and production continuity.

Westec's ISO Class mobile clean room for medical injection molding and secondary operations

Westec's experienced plastic molders working on the manufacturing floor

Supporting Industries Where Precision Matters Most

We specialize in supporting a range of precision-driven industries requiring tight tolerances, regulatory compliance, and consistent performance. This includes medical devices, biotech and pharmaceutical, electronics, aerospace and defense, and select consumer and food and beverage applications.

As an ISO 13485:2016 certified manufacturer, we support regulated industries with advanced quality systems, validation processes, and inspection capabilities to ensure consistent, repeatable performance.

Delivering Precision Plastic Parts Since 1969

Recent Westec Company Milestones:

2020 Improvements & Additions

Extended our building by 9,200 sq/ft and brought our total facility square footage up to 46,080
Remodeled 2nd Ops to include open space and additional clean room capabilities
Remodeled warehouse into new space
Two-shot molding capabilities implemented in 2nd quarter
Implemented cobots, automation, and additional robots

2019 Improvements & Additions

Added Class 7 clean room capabilities for secondary operations
Purchased a Keyence IM-7030T Instant Measurement System
Invested in a Branson Mini II Linear Vibration Welding Machine
Added a Branson 2000Xdt 15KhZ, 2200 W Ultrasonic Welder
Procured Minilase XL Laser Engraver
Obtained a KP08 Cupslide Pad Printer with extended pad reach for larger projects
Increased our Class 8 molding clean room to 989 sq/ft including a full gowning room

Westec Prior Year Accomplishments

2018 – Achieved ISO 13485:2016 certification
2018 – Procured custom built roll printer for tight tolerance pad printing
2018 – Purchased an Arburg molding machine (88T)
2017 – Purchased a 6-color pad printing machine
2016 – Invested in two molding machines (610T Milacron, 110T Milacron)
2016 – Installed an ISO Class 6 secondary operations clean room
2016 – Added a Mitutoyo CMM and Starrett Optical Comparator
2015 – Invested in an electric Sumitomo injection molding machine (385T)

2014 – Purchased a local competitor in a strategic acquisition
2014 – Expanded our in-house tool room with a Makino F3 Vertical Machining Center and an Agie Charmilles FORM 20 EDM
2014 – Invested in four injection molding machines. Two hydraulic Van Dorn machines (85T & 170T) and two electric Sumitomo machines (both 198T).
2012 – Added an additional 14,000 sq/ft of manufacturing and warehouse
2000 – Original Registration ISO 9001 October 17,2000
1997 – Westec Plastics relocated from San Jose to Livermore, California.

Providing Our Customers with High Quality Plastic Parts Since 1969

In 1969, our founder Paul Biery returned from the Vietnam War to start Westec Plastics with his wife Karen. Paul was a toolmaker by trade, and wanted to be able to sample his tools in-house. He purchased his first machine out of a farmer’s barn in Gilroy, California that year — pretty soon, Westec Plastics was born.

Westec is celebrating over 50 years in business! Learn more about it here.

Westec Plastics Corp original machining center in Bridgeport with 1969 Dodge Charger and 1960 red Ford truck parked in front — The red truck was used to move our first machine to Westec, Machine #1, in July 1969.

Need Support for Your Next Injection Molding Project?

Work with a plastic injection molding team in California that can support design, tooling, and production — all under one roof.

What Our Customers Say

I love the team. They’re very friendly which is their best attribute. They’re easy to work with – down to earth and deliver with a family business feel, that’s really a strength of theirs. They’re well-rounded in terms of balancing quality, processing, and competitive in all those aspects.

Sara N, Co-founder, Medical Device Company
A quick reply or RFQ for our early stage development is important. We find companies that support our needs with the shortest lead times for tooling and components. Westec fills this need for us. Their professionals ensure they produce high quality parts and they work closely with us to ensure we are satisfied with service, documents, and components. They’re a pleasure to work with.

Victor B. – Bio Tech Diagnostics Company