Hi-Rel Plastics & Molding Corp. is an ISO-certified custom plastic injection molding company in California providing precision plastic manufacturing solutions for OEMs and manufacturers across demanding regulated and commercial industries.
With more than 40 years of plastics manufacturing experience, Hi-Rel supports customers from product development and Design for Manufacturability (DFM) through custom mold and tool making, plastic injection molding, secondary operations, assembly, packaging and ongoing production.
Our extensive injection molding capabilities include precision plastic injection molding, cleanroom medical injection molding, ISO Class 7 and ISO Class 8 cleanroom molding, Liquid Silicone Rubber (LSR) molding, overmolding, insert molding, vertical injection molding, engineering-grade thermoplastic molding and custom injection mold manufacturing.
Hi-Rel also provides injection mold transfer services for companies looking to relocate existing tooling to a new plastic injection molding manufacturer.
As an ISO 9001:2015, ISO 13485:2016 and AS9100 Rev D certified plastics manufacturer, Hi-Rel supports the medical industry, pharmaceutical industry, aerospace and defense industry, industrial equipment manufacturers, electronics, consumer, agriculture, packaging, food and beverage, automotive and numerous other industries.
Our manufacturing services extend beyond injection molding to include plastic blow molding, thermoforming and vacuum forming, rotational molding, LSR molding, mold making and comprehensive secondary operations, providing customers with a single manufacturing resource for complex multi-process plastic products.
Hi-Rel serves customers throughout Los Angeles, Riverside, Orange County, San Diego, San Bernardino, the Inland Empire, Southern California, Northern California, Silicon Valley, the San Francisco Bay Area, Sacramento and across the USA.
Every plastic injection molding project presents different requirements for part geometry, resin, tolerances, tooling, production volume, surface finish, cleanliness and secondary operations.
Hi-Rel provides flexible custom injection molding solutions designed around those individual requirements.
Our plastic injection molding capabilities include:
Precision molding processes ensure accurate, repeatable parts for demanding applications.
Support for a wide range of engineering-grade thermoplastics.
Efficient processes designed for large-scale manufacturing with consistent quality.
From prototyping to production and secondary operations, all under one roof.
By combining engineering, custom mold manufacturing, injection molding and value-added manufacturing capabilities, Hi-Rel can support projects ranging from individual precision components to complex multi-component plastic assemblies.
Precision plastic injection molding is used to manufacture repeatable plastic components with complex geometry, detailed features and demanding dimensional requirements.
Producing a consistent injection molded component requires much more than filling a mold cavity with molten resin. Product design, plastic material selection, mold construction, gating, cooling, venting, process development, inspection and ongoing process control can all influence the quality of the finished component.
Hi-Rel’s engineering and manufacturing teams evaluate these factors throughout product development and production.
Our approach to precision injection molding can include evaluation of part geometry, wall thickness, draft, ribs and bosses, undercuts, gate locations, parting lines, material flow, cooling, ejection, sink and warpage risk, weld lines, dimensional tolerances, surface finish, cosmetic requirements, secondary operations and assembly requirements.
This comprehensive approach helps establish a robust manufacturing process capable of producing consistent, high-quality injection molded plastic parts throughout the life of the program.
Hi-Rel provides cleanroom medical injection molding services in California for contamination-sensitive medical, pharmaceutical, diagnostic, healthcare and life science applications.
Hi-Rel’s ISO Class 7 cleanroom, commonly referred to as a Class 10,000 cleanroom, provides a controlled manufacturing environment for applications requiring enhanced particulate control.
Hi-Rel also provides ISO Class 8 / Class 100,000 cleanroom manufacturing capability, giving customers flexibility based on specific product and process requirements.
Cleanroom injection molding can support:
As an ISO 13485:2016 certified manufacturer, Hi-Rel combines controlled-environment manufacturing with established quality systems for demanding medical plastic molding applications.
Companies developing medical devices can also explore Hi-Rel’s dedicated medical device injection molding capabilities.
Hi-Rel provides Liquid Silicone Rubber molding services for applications requiring flexible, durable and high-performance silicone components.
LSR offers characteristics that can make it suitable for applications requiring:
LSR injection molding can be used for components such as seals, gaskets and flexible components for medical, healthcare, aerospace, electronics, industrial and consumer applications.
Because Hi-Rel provides both thermoplastic injection molding and LSR injection molding, customers developing products containing rigid plastic and flexible silicone components can consolidate more of their manufacturing requirements with one supplier
Plastic overmolding combines multiple materials or components into a single molded part.
A rigid thermoplastic substrate, metal component or previously molded component can be combined with another compatible material to provide additional functional or cosmetic features.
Overmolding can help improve grip, ergonomics, impact protection, sealing, vibration absorption, surface feel, appearance and component integration.
Material combinations can include rigid thermoplastics with TPE, TPU, silicone and other compatible elastomeric materials.
Hi-Rel’s mold and tooling capabilities include tooling support for overmolding, insert molding, multi-shot molding and vertical molding applications.
Insert molding allows metal or other pre-manufactured components to be incorporated directly into an injection molded plastic part.
Common molded-in components include threaded inserts, bushings, pins, fasteners, electrical contacts, terminals, connectors and other functional inserts.
Insert molding can reduce downstream assembly, increase component strength, incorporate threaded or conductive features and consolidate multiple components into a single manufactured part.
Hi-Rel provides custom insert molding for medical, aerospace, electronics, industrial, automotive and consumer applications.
Hi-Rel provides vertical injection molding services for applications where inserts, components or substrates need to be accurately positioned within the mold prior to injection.
Vertical molding can be particularly effective for insert molding and overmolding applications involving metal inserts, electrical contacts, connectors, cables, bushings, fasteners, electronic components and pre-molded substrates.
Hi-Rel’s cleanroom medical molding capabilities also include vertical injection molding for insert molding and overmolding applications requiring secure component integration.
The quality and productivity of an injection molding program begin with the mold.
Hi-Rel provides custom injection mold manufacturing and mold making services for new plastic products and established production programs.
Tooling capabilities can support:
Hi-Rel provides both onshore and offshore tooling options, allowing tooling strategies to be developed around project requirements, budget, production volume, lead time and long-term manufacturing objectives.
Our mold and tool making services can support injection molding, blow molding, thermoforming and rotational molding applications.
Early engineering involvement can help identify potential tooling and production problems before substantial investments are made.
Hi-Rel provides Design for Manufacturability (DFM) support for plastic injection molding projects.
DFM analysis can evaluate:
For applicable programs, mold flow analysis can provide additional insight into filling behavior, gate location, pressure, weld lines, cooling, shrinkage and warpage risk.Customers evaluating resins during this stage can also review Hi-Rel’s guide to thermoplastic injection molding material selection.
Companies do not always need a new injection mold when changing manufacturers.
Hi-Rel provides injection mold transfer services, tooling transfer services and existing mold evaluation for OEMs seeking a new injection molding supplier.
Companies may transfer molds because of supplier quality problems, delivery delays, capacity limitations, supplier consolidation, increasing manufacturing costs, supplier closure, reshoring initiatives or the need for specialized manufacturing capabilities.
Depending on the program, transferred tooling may require mold inspection, repair, refurbishment, engineering modifications, sampling and process development. Hi-Rel’s mold and tool making team supports mold repair, refurbishment, engineering changes and tooling-transfer requirements.
Selecting the correct plastic resin is critical to product performance and manufacturability.
Hi-Rel works with a broad range of commodity thermoplastics, engineering-grade plastics, high-performance polymers, elastomers, filled materials, reinforced materials, specialty resins and medical-grade plastics.
Common materials include:
For additional technical information, review our resource on thermoplastic injection molding material selection.
Many injection molded components require additional manufacturing operations before becoming finished products.
Hi-Rel provides comprehensive secondary operations for injection molded plastic parts, helping customers consolidate manufacturing with fewer suppliers.
Available capabilities include:
Combining injection molding, secondary operations, assembly and packaging can simplify supply-chain management while improving control over quality and production scheduling.
One significant advantage of working with Hi-Rel is access to several plastic manufacturing technologies.
Hi-Rel’s plastic blow molding services include extrusion blow molding (EBM), injection blow molding (IBM) and injection stretch blow molding (ISBM) for bottles, containers, reservoirs and other hollow plastic components.
Our plastic thermoforming and vacuum forming services support trays, housings, covers, packaging components and custom formed plastic products.
Hi-Rel’s custom rotational molding services support larger hollow plastic products and components requiring durable, seamless construction.
Our LSR injection molding capabilities complement thermoplastic molding for flexible and high-performance silicone components.
Hi-Rel provides custom mold and tool manufacturing for multiple plastic manufacturing processes.
This broad manufacturing platform can help OEMs consolidate products requiring several different plastic manufacturing technologies with one supplier.
Hi-Rel provides plastic injection molding for medical applications and pharmaceutical applications.
Capabilities include cleanroom molding, precision thermoplastic molding, LSR molding, insert molding, overmolding, medical-grade resin processing, custom tooling, secondary operations, assembly and packaging support.
For applications requiring controlled manufacturing environments, visit our dedicated ISO Class 7 and ISO Class 8 cleanroom molding page.
Hi-Rel’s AS9100 Rev D certification supports demanding aerospace and defense plastic manufacturing applications.
Injection molding capabilities can support precision housings, electrical components, connectors, enclosures, structural components, insert-molded parts and high-performance engineered thermoplastic components.
Materials such as PEEK, PEI/ULTEM, PPS, LCP, glass-filled nylon and other engineering-grade plastics can be evaluated depending on application requirements.
Hi-Rel provides industrial plastic molding services for equipment manufacturers and industrial OEMs requiring durable and repeatable engineered plastic components.
Applications can include equipment housings, machine components, handles, covers, electrical components, connectors, brackets and fluid-management components.
Hi-Rel supports plastic molding for agricultural and farming equipment requiring durable components capable of performing in demanding outdoor environments.
Applications can include irrigation valve bodies, fittings, sensor housings, control housings and equipment components.
OEM purchasing managers and engineers evaluating plastic injection molding companies in California should consider more than molded-part price.
Hi-Rel offers:
This combination enables customers to consolidate engineering, tooling, molding and secondary manufacturing operations with an experienced California plastics manufacturer.
Companies searching for plastic injection molding in Los Angeles or Southern California can work with Hi-Rel for custom injection molding, tooling, mold transfers and secondary manufacturing.
Hi-Rel supports OEMs throughout Los Angeles, Riverside, Orange County, San Bernardino, San Diego, the Inland Empire and surrounding Southern California markets.
Customers requiring multiple technologies can combine injection molding with blow molding, thermoforming and vacuum forming, rotational molding and LSR molding.
Hi-Rel also serves Northern California customers throughout the San Francisco Bay Area, Silicon Valley, San Jose, Santa Clara, Fremont, Oakland and Sacramento.
These capabilities support medical device manufacturers, aerospace companies, technology companies, industrial OEMs and other organizations seeking an experienced California injection molding manufacturer.
Although based in California, Hi-Rel supports manufacturers throughout the United States.
OEMs can utilize Hi-Rel for new tooling programs, transferred molds, medical molding, precision injection molding, specialized molding processes and turnkey plastics manufacturing programs.
Explore Hi-Rel Plastics & Molding’s complete manufacturing capabilities to learn more about available processes and services.
Yes. Hi-Rel provides custom mold and tool making services for new injection molding programs as well as other plastic manufacturing processes.
Yes. Hi-Rel provides cleanroom medical injection molding in ISO Class 7 / Class 10,000 and ISO Class 8 / Class 100,000 controlled environments.
Yes. Hi-Rel provides Liquid Silicone Rubber molding services for flexible and high-performance silicone components.
Hi-Rel works with commodity, engineering-grade, specialty, filled, reinforced and medical-grade thermoplastics. Additional information is available in our thermoplastic injection molding material selection guide.
Yes. Hi-Rel provides assembly, printing, labeling, bonding, ultrasonic welding, heat insertion, CNC machining, finishing, packaging, filling and sealing and other secondary manufacturing services.
In addition to injection molding, Hi-Rel offers plastic blow molding, thermoforming and vacuum forming, rotational molding, LSR molding and custom mold manufacturing.
Whether your project requires a new injection mold, existing mold transfer, cleanroom medical molding, LSR molding, overmolding, insert molding, vertical molding or conventional precision injection molding, Hi-Rel Plastics & Molding Corp. can evaluate your manufacturing requirements.
Send available 3D CAD files, 2D drawings, material specifications, estimated annual usage, tooling information and secondary-operation requirements through our contact and project inquiry page.
Partner with Hi-Rel Plastics & Molding Corp. for custom plastic injection molding, tooling and complete plastics manufacturing services in California and across the USA.
Precision molding processes ensure accurate, repeatable parts for demanding applications.
Support for a wide range of engineering-grade thermoplastics.
Efficient processes designed for large-scale manufacturing with consistent quality.
From prototyping to production and secondary operations, all under one roof.
