Hi-Rel Plastics & Molding Corp. provides comprehensive plastic assembly services, mechanical assembly, cable assembly, clean room assembly, subassembly, and value-added secondary operations for OEMs and product manufacturers throughout California and across the United States.
As an ISO 9001, AS9100 and ISO 13485 certified contract manufacturer, we support projects from engineering and prototyping through mold manufacturing, plastic molding, component production, assembly, finishing, inspection, packaging, and delivery. Our integrated manufacturing capabilities help customers consolidate suppliers, simplify purchasing, improve production coordination, and move products efficiently from individual components to completed assemblies.
Hi-Rel Plastics & Molding supports assembly programs for medical devices, aerospace and defense, automotive and electric vehicles, electronics, industrial equipment, research and laboratory products, pharmaceutical applications, consumer products, food and beverage, packaging, agriculture, and other demanding industries.
Whether your project requires a simple plastic subassembly or a more complex multi component finished assembly, our team can develop an assembly process around your drawings, specifications, quality requirements, production quantities, and end-use application.
Hi-Rel Plastics & Molding provides plastic parts assembly services for components manufactured through multiple processes.
Customers can combine assembly with our plastic injection molding, blow molding, liquid silicone rubber molding, thermoforming, vacuum forming, rotational molding, CNC machining, and other manufacturing capabilities.
Depending on product design and assembly requirements, components may be joined, installed, aligned, fastened, bonded, welded, inserted, decorated, inspected, and packaged as part of a coordinated manufacturing program.
Assembly capabilities can support:
Combining component manufacturing and assembly through one supplier can reduce unnecessary transportation and handling while providing greater visibility over the complete production process.
Our mechanical assembly services support products requiring multiple molded, machined, metal, purchased, or customer-supplied components to be combined into a finished assembly or subassembly.
Depending on project requirements, mechanical assembly can involve the installation of screws, fasteners, inserts, clips, springs, brackets, hardware, molded components, machined components, cables, and other product-specific elements.
Hi-Rel Plastics & Molding can integrate mechanical assembly with our custom plastic and metal CNC machining services and plastic manufacturing capabilities, providing customers with a more complete contract manufacturing solution.
Assembly processes are developed according to customer drawings, bills of materials, specifications, approved work instructions, inspection requirements, and production needs.
Many modern products incorporate both plastic and metal components.
Hi-Rel Plastics & Molding provides plastic and metal component assembly services that can combine molded plastic components with machined parts, inserts, brackets, fasteners, hardware, cables, and other components.
Our ability to support both plastic injection molding and plastic and metal CNC machining can help simplify programs involving multiple manufacturing technologies.
This integrated approach is particularly valuable for OEMs seeking a manufacturing partner capable of supporting components from initial prototype and tooling through production and final assembly.
Combines multiple components into fully assembled, ready-to-use products.
Standardized processes ensure accuracy and repeatability.
Reduces handling, lead times, and the need for multiple vendors.
Supports a wide range of product types and complexity levels.
Products used in medical, pharmaceutical, diagnostic, laboratory, biotechnology, and other contamination-sensitive applications may require assembly within a controlled manufacturing environment.
Hi-Rel Plastics & Molding offers both Class 10,000 / ISO Class 7 cleanroom environments and Class 100,000 / ISO Class 8 cleanroom environments for qualifying cleanroom manufacturing and assembly programs.
Our cleanroom capabilities can support:
Customers requiring medical plastic components can combine clean room assembly with our medical device injection molding services, allowing molding, secondary operations, assembly, inspection, and other production steps to be coordinated through a single manufacturing partner.
Hi-Rel Plastics & Molding is ISO 13485 certified and provides manufacturing and assembly support for medical device, diagnostic, pharmaceutical, healthcare, and laboratory product manufacturers.
Medical programs may require significantly more than production of an individual molded component. Finished products and subassemblies can involve molded plastic parts, silicone components, machined components, inserts, hardware, adhesives, printing, welding, assembly, inspection, and packaging.
Our vertically integrated manufacturing capabilities allow customers to combine medical device injection molding, liquid silicone rubber molding, tooling, machining, clean room assembly, ultrasonic welding, adhesive bonding, pad printing, and other secondary operations.
Hi-Rel Plastics & Molding can support medical manufacturing programs from early product development and prototyping through tooling, production, secondary processing, and assembly.
Hi-Rel Plastics & Molding is AS9100 certified and supports aerospace and defense programs requiring precision manufacturing, documented quality systems, component assembly, and value-added secondary operations.
Our aerospace and defense manufacturing capabilities can support molded and machined components, housings, brackets, enclosures, cable-management components, hardware assemblies, and other custom plastic and metal products.
By combining molding, machining, secondary operations, inspection, and mechanical assembly, Hi-Rel Plastics & Molding provides aerospace OEMs and suppliers with a more integrated manufacturing solution.
Hi-Rel Plastics & Molding can support cable assembly and component integration as part of larger mechanical and electromechanical product assemblies where appropriate.
Projects may involve combining molded housings, plastic components, metal components, hardware, connectors, cables, and customer-specified purchased components into a finished subassembly.
This capability can be particularly useful for products serving electronics, electrical equipment, aerospace, medical equipment, industrial systems, automotive, EV, and other applications requiring multiple components to be integrated into a completed product.
One of the major advantages of working with Hi-Rel Plastics & Molding is the ability to combine plastic injection molding and assembly services within a coordinated manufacturing program.
Our custom plastic injection molding services support prototype, low-volume, medium volume, and high-volume production using a broad range of thermoplastics and engineering resins.
After molding, components can move into secondary operations such as machining, insertion, bonding, welding, printing, finishing, assembly, inspection, and packaging.
Keeping multiple production stages with one manufacturing partner can provide important advantages:
Customers can also combine production with mold and tooling manufacturing for an even more integrated manufacturing program.
Some assemblies require joining methods other than conventional mechanical fasteners.
Our adhesive bonding services can support compatible plastic-to-plastic, plastic-to-metal, and other multi-material assemblies depending on substrate, adhesive, geometry, and product requirements.
Adhesive bonding can be useful when mechanical fastening is impractical, visible hardware is undesirable, or dissimilar materials need to be joined.
The appropriate joining method is evaluated according to the specific product design and application.
For compatible thermoplastic components, ultrasonic welding can provide another method of permanently joining components.
Ultrasonic welding uses high-frequency mechanical vibration to generate localized heat at the joint interface, enabling compatible thermoplastic components to be joined without conventional fasteners.
Integrating ultrasonic welding with injection molding and assembly can help customers create complete plastic assemblies without transporting components between multiple suppliers.
Hi-Rel Plastics & Molding also offers heat insertion and heat staking for qualifying plastic assemblies.
Heat staking can be used to mechanically secure components within an assembly, while heat insertion can install threaded metal inserts into thermoplastic components to create durable fastening points.
These processes can be incorporated into larger mechanical assemblies containing plastic components, metal hardware, fasteners, inserts, and other product elements.
Assemblies may require graphics, identification, instructions, logos, symbols, or other decorative and functional markings.
Our pad printing services can be incorporated into molded-component and assembly programs, helping customers consolidate production and decorating operations.
Depending on project requirements, Hi-Rel Plastics & Molding can also support additional secondary decorating and finishing operations.
Assembly is one part of the comprehensive range of secondary manufacturing services available from Hi-Rel Plastics & Molding.
Customers can combine assembly with:
These integrated capabilities allow Hi-Rel Plastics & Molding to provide more than individual molded components—we can support customers requiring value-added manufacturing, subassemblies, and more complete finished-product solutions.
Our blow molding capabilities include extrusion blow molding (EBM), injection blow molding (IBM), and injection stretch blow molding (ISBM).
Blow molded components can be combined with secondary operations including trimming, leak testing, labeling, printing, adhesive bonding, hardware installation, component assembly, packaging, filling and sealing, heat staking, and ultrasonic welding depending on project requirements.
This makes Hi-Rel Plastics & Molding a valuable manufacturing partner for customers requiring bottles, containers, reservoirs, ducts, housings, and other hollow plastic products requiring additional operations before shipment.
Large housings, covers, panels, trays, enclosures, and other thermoformed components frequently require additional operations after forming.
Hi-Rel Plastics & Molding can integrate thermoforming and vacuum forming with CNC trimming, drilling, hardware installation, adhesive bonding, mechanical assembly, printing, finishing, and packaging to provide customers with more complete finished components.
Rotationally molded products can also require assembly and secondary processing after molding.
Large hollow products, housings, tanks, containers, covers, and industrial components may require machining, trimming, inserts, fittings, hardware, labeling, bonding, or mechanical assembly before they are ready for the customer’s production line.
Our integrated manufacturing approach allows these secondary operations to be coordinated with the primary molding process.
Assembly requirements should ideally be considered early in product development.
Hi-Rel Plastics & Molding provides engineering and prototyping support to help customers evaluate part manufacturability, component interfaces, fastening methods, joining processes, tooling requirements, tolerances, materials, and assembly considerations before full production.
Our engineering support can be combined with 3D printing and rapid prototyping to evaluate concepts and assemblies before committing to production tooling.
Once the design is finalized, Hi-Rel Plastics & Molding can support mold and tooling manufacturing, component production, secondary operations, assembly, and production scaling.
This prototype-to-production manufacturing approach provides continuity throughout the product-development process.
Hi-Rel Plastics & Molding provides plastic, mechanical, cleanroom, and contract assembly services for a wide variety of industries.
Medical & Healthcare
Medical devices, diagnostic equipment, laboratory components, medical housings, pharmaceutical-related components, disposable products, and other assemblies requiring precision manufacturing and controlled environments.
Aerospace & Defense
Precision plastic and metal components, housings, brackets, cable-management components, enclosures, and assemblies supported by our AS9100 quality management system.
Automotive & Electric Vehicles
Plastic housings, electrical components, cable-related assemblies, brackets, covers, interior components, fluid-system components, and other automotive and EV assemblies.
Electronics & Electrical
Plastic enclosures, connector components, cable assemblies, housings, insulating components, switches, sensor housings, and other electronic product assemblies.
Industrial Equipment
Machine components, equipment housings, protective covers, controls, brackets, fluid handling components, and multi-component industrial assemblies.
Research & Laboratory Equipment
Instrument housings, diagnostic components, laboratory assemblies, fluid-management products, test equipment components, and other precision products.
Consumer Products
Appliance components, housings, dispensing products, cosmetic assemblies, household products, handles, enclosures, and other finished consumer assemblies.
Packaging, Food & Beverage
Containers, closures, dispensing components, packaging systems, and other products requiring molding, secondary processing, assembly, decorating, or packaging operations.
OEMs searching for an assembly company in California often need more than labor for putting components together. They need a manufacturing partner capable of managing component production, quality, secondary operations, assembly, and delivery.
Hi-Rel Plastics & Molding offers:
By combining these capabilities, Hi-Rel Plastics & Molding can support projects from concept and prototype through tooling, manufacturing, assembly, finishing, and delivery.
Hi-Rel Plastics & Molding is located in Riverside, California and supports customers throughout Riverside, San Bernardino, the Inland Empire, Los Angeles, Orange County, San Diego, Ventura, Southern California, Northern California, and across the United States.
Whether you are searching for a plastic assembly company, mechanical assembly services, cleanroom assembly services, medical device assembly, plastic and metal assembly, injection molding and assembly, secondary assembly services, or a complete contract manufacturing partner, our team can review your requirements and develop a manufacturing solution around your product.
Looking for an experienced contract manufacturer capable of producing components and completing secondary operations and assembly?
Contact Hi-Rel Plastics & Molding Corp. with your CAD files, drawings, bill of materials (BOM), assembly instructions, material requirements, quality requirements, estimated order quantities, annual usage, and application information.
Our team can review your project and determine how our molding, machining, assembly, cleanroom manufacturing, and secondary operations can support your production requirements.
Hi-Rel Plastics provides complete assembly services for plastic, metal, and multi-component products across a wide range of industries. Our assembly capabilities support everything from sub-assemblies to fully finished products, helping streamline production and reduce supply chain complexity.
The assembly process involves the integration of individual components into a finished product or functional sub-assembly using mechanical fastening, adhesive bonding, soldering, wiring integration, and other assembly methods based on application requirements. Services include plastic and metal part assembly, mechanical assembly, cable and wiring integration, chassis assemblies, and final product assembly.
Cable assembly and wire harness assembly services support organized electrical connectivity for products requiring routed wiring systems, connectors, terminals, and bundled cable management. These assemblies are commonly used in electronic devices, industrial equipment, aerospace & defense, automotive, control systems, medical products, and other applications requiring reliable electrical integration and clean internal organization.
By combining manufacturing and secondary operations under one roof, Hi-Rel Plastics helps ensure consistent quality, efficient production, and dependable turnaround times for both standard and custom assemblies.
Hi-Rel Plastics offers comprehensive product assembly services to deliver fully integrated, ready-to-use components. From simple sub-assemblies to complex multi-part systems, our team ensures accurate, efficient, and consistent results.
Product assembly streamlines production by combining multiple components into a single, finished unit. Hi-Rel Plastics integrates assembly processes with manufacturing to reduce lead times, improve quality control, and simplify supply chains.
With experience across a wide range of products and assembly requirements, we help manufacturers bring complete, market-ready solutions to life.
Combines multiple components into fully assembled, ready-to-use products.
Standardized processes ensure accuracy and repeatability.
Reduces handling, lead times, and the need for multiple vendors.
Supports a wide range of product types and complexity levels.
Combines multiple components into fully assembled, ready-to-use products.
Standardized processes ensure accuracy and repeatability.
Reduces handling, lead times, and the need for multiple vendors.
Supports a wide range of product types and complexity levels.
