Hi-Rel Plastics & Molding Corp. provides comprehensive mold making, custom injection mold manufacturing, mold design, tool making, and tooling manufacturing services for OEMs and product manufacturers throughout Los Angeles, Southern California, Northern California, California, and across the USA.
With more than 40 years of plastics manufacturing experience, Hi-Rel Plastics & Molding supports customers from initial product development and Design for Manufacturability (DFM) through mold design, mold manufacturing, sampling, qualification, production molding, mold maintenance, repair, modification, and ongoing manufacturing.
Customers can also use Hi-Rel Plastics & Molding’s 3D Printing & Rapid Prototyping services during early-stage design development to evaluate form, fit, and functionality before committing to production tooling.
Our tooling capabilities extend far beyond conventional thermoplastic injection molds. Hi- Rel Plastics & Molding provides custom mold and tool manufacturing services for:
Whether your program requires a prototype tool, bridge mold, single-cavity production mold, complex multi-cavity injection mold, blow mold, LSR mold, thermoforming tool, vacuum forming mold, or rotational molding tool, our engineering team can develop a tooling solution around the requirements of your product, material, production volume, quality requirements, and budget.
A successful injection molding program starts with a properly engineered mold. Mold construction can directly affect dimensional consistency, cosmetic quality, cycle time, scrap rates, automation, maintenance requirements, and the long-term economics of a molding program.
Hi-Rel Plastics & Molding provides custom injection mold manufacturing services for simple through highly complex plastic components. Our tooling team works with customers to determine the appropriate mold construction based on part geometry, resin, expected annual volume, tolerance requirements, surface finish, production environment, automation requirements, and anticipated tool life.
Engineered molds built to meet specific part requirements and performance standards.
Advanced machining processes ensure accuracy and consistency in every tool.
Molds designed for long-term use and high-volume production environments.
Ongoing support to maintain tool performance and extend operational life.
Custom injection mold capabilities can include:
For medical and high-purity applications, tooling can also be developed for Hi-Rel Plastics & Molding’s Cleanroom Medical Injection Molding services.
Our goal is not simply to manufacture a mold. We develop production-ready injection molding tooling engineered around reliable, repeatable manufacturing.
Good mold manufacturing begins before steel is cut.
Hi-Rel Plastics & Molding’s engineering and tooling teams evaluate the relationship between the plastic component, material, mold construction, molding machine, and expected production requirements before tooling moves into manufacturing.
Our injection mold design and engineering services may include evaluation of:
Evaluating these factors early can reduce expensive engineering changes after the mold has already been manufactured.
For customers still validating geometry, Hi-Rel Plastics & Molding can incorporate rapid prototyping and 3D printing before production mold construction.
Hi-Rel Plastics & Molding incorporates Design for Manufacturability (DFM) into the tooling development process to identify potential manufacturing challenges before committing to production tooling.
DFM analysis can help identify concerns involving draft, wall thickness, undercuts, shutoffs, parting lines, ejection, gating, tolerances, and other features that may influence part quality or mold complexity.
When appropriate, Mold Flow Analysis can provide additional insight into how molten resin is expected to behave inside the mold. Mold simulation may be used to evaluate factors such as:
Combining DFM, mold flow analysis, mold design, tooling engineering, rapid prototyping, and injection molding experience provides a more complete approach to developing reliable production tooling.
Additional technical information about resin behavior, mold design, processing, and material performance is available in Hi-Rel Plastics & Molding’s Injection Molding Material Selection resource and broader Resources library.
Not every product requires the same mold construction.
A prototype program producing hundreds of components has very different tooling requirements from a medical, aerospace, automotive, electronics, or consumer product program expected to manufacture hundreds of thousands or millions of parts.
Hi-Rel Plastics & Molding helps customers select tooling based on the expected production requirements and can support SPI mold classifications including:
SPI Class 105 – Prototype Tooling
Designed for limited prototype quantities and early product evaluation.
SPI Class 104 – Low-Volume Production Tooling
Suitable for lower production quantities and programs where tooling economics are especially important.
SPI Class 103 – Medium-Volume Production Tooling
Production tooling designed for increased durability and repeatability.
SPI Class 102 – Medium-to-High-Volume Tooling
Robust production molds engineered for extended manufacturing programs.
SPI Class 101 – High-Volume Production Tooling
High-performance molds designed for demanding, high-volume production programs and extended mold life.
Tool construction is evaluated individually because material selection, part geometry, molding conditions, cycle requirements, and maintenance can all affect actual mold life.
One of Hi-Rel Plastics & Molding’s advantages as a custom mold and tool manufacturing company is our ability to support tooling for several plastics manufacturing technologies rather than injection molding alone.
Hi-Rel Plastics & Molding provides plastic injection molding mold design and manufacturing for thermoplastic components ranging from straightforward molded products to complex precision parts requiring slides, lifters, inserts, multiple cavities, specialized gating, tight tolerances, or advanced surface finishes.
Tooling can be developed for commodity resins, engineering thermoplastics, filled materials, high-temperature polymers, and other specialty molding materials.
Liquid Silicone Rubber mold manufacturing presents different tooling challenges from conventional thermoplastic injection molding.
Hi-Rel Plastics & Molding provides LSR injection molding mold design and tool making services for medical, electronics, industrial, consumer, sealing, and other silicone applications.
LSR tooling can require extremely precise mold construction, controlled venting, specialized gating, accurate temperature management, and careful consideration of flash.
Our ability to support both LSR mold manufacturing and LSR injection molding allows tooling and production requirements to be evaluated together.
Hi-Rel Plastics & Molding offers extrusion blow molding and blow mold manufacturing services for custom bottles, containers, reservoirs, ducts, hollow components, and specialty blow molded products.
EBM mold design must consider factors such as part geometry, pinch-off design, neck and finish requirements, cooling, venting, flash, wall distribution, and trimming requirements.
Our engineering experience in extrusion blow molding and blow mold manufacturing helps customers develop tooling around the actual production requirements of their products.
Hi-Rel Plastics & Molding also supports tooling for Stretch Blow Molding (SBM) and Injection Stretch Blow Molding (ISBM) as part of our broader blow molding manufacturing capabilities .
These processes are commonly used for bottles, containers, and packaging products requiring controlled dimensions, consistent neck finishes, clarity, strength, and repeatable material distribution.
Our mold and tooling resources can support customers developing custom packaging and specialty blow molded components from design through production.
Hi-Rel Plastics & Molding provides thermoforming and vacuum forming mold manufacturing and custom tooling services for trays, housings, covers, packaging, medical products, industrial components, and other formed plastic products.
Depending on the program, tooling may incorporate aluminum construction, vacuum passages, cooling features, plugs, trim fixtures, and other components necessary for consistent forming and trimming.
We can support both prototype thermoforming tools and production thermoforming tooling.
Hi-Rel Plastics & Molding provides rotational molding mold design and manufacturing services for hollow plastic products including tanks, housings, containers, enclosures, industrial components, and specialty products.
Rotomolding tools must account for product geometry, mold construction, venting, inserts, parting lines, release, heat transfer, and other factors unique to the rotational molding process.
By supporting both rotational molding tooling and production, Hi-Rel Plastics & Molding can help customers develop a more integrated manufacturing program.
Selecting the proper mold material is an important part of custom tooling development. Tool material may be selected according to expected production volume, molded resin, operating temperature, surface finish, corrosion requirements, wear characteristics, budget, and expected tool life.
Materials can include:
Material selection is evaluated based on the specific requirements of each tooling program.
Depending on tooling requirements, mold manufacturing processes can include:
For precision-machined mold components, inserts, fixtures, and related manufacturing requirements, Hi-Rel Plastics & Molding also provides Plastic & Metal CNC Machining services.
These manufacturing technologies enable production of complex mold cavities, cores, inserts, slides, lifters, shutoffs, cooling features, and other precision tooling components.
Hi-Rel Plastics & Molding supports a broad range of injection mold surface finishes and mold textures based on product appearance and functional requirements.
Options can include:
Surface finish is considered during mold design because cosmetic requirements can influence tool steel selection, draft, polishing, ejection, and mold construction.
After molding, customers can also use Hi-Rel Plastics & Molding’s Surface Treatment & Enhancement services, pad printing services, Hot Stamping and Foil services, and Label Application services for finished production parts.
Hi-Rel Plastics & Molding can support both hot runner and cold runner injection mold systems.
Hot runner tooling may be beneficial for applications where reducing runner waste, improving cycle efficiency, supporting high-cavitation tooling, or controlling gate locations is important.
Cold runner molds can provide a simpler and economical solution for many applications.
Available tooling configurations can include:
Our engineering team evaluates part geometry, resin, volume, quality requirements, and production economics when recommending the appropriate mold configuration.
The completion of mold manufacturing is only one stage of launching a successful molding program.
Once tooling is completed, the mold must be sampled and evaluated to verify that the mold, material, molding process, and finished component work together as intended.
Depending on customer requirements, tooling qualification can include:
Hi-Rel Plastics & Molding’s manufacturing programs are supported by documented Quality and inspection systems for demanding medical, aerospace, automotive, industrial, and other applications.
Because Hi-Rel Plastics & Molding provides tooling and plastic molding services, customers can transition from mold manufacturing into production with a manufacturing partner familiar with the tooling program.
Already own your mold?
Hi-Rel Plastics & Molding can evaluate existing injection molds and transferred tooling for customers looking to relocate production, establish a new molding supplier, bring an idle mold back into production, or resolve manufacturing issues with an existing tool.
Our mold transfer services can include:
Customers searching for a new injection molding company for an existing mold can work with Hi-Rel Plastics & Molding to evaluate both the condition of the tooling and the requirements necessary to establish reliable production.
Production tooling requires proper maintenance throughout its operating life.
Hi-Rel Plastics & Molding provides mold maintenance, injection mold repair, mold refurbishment, mold modification, and tooling engineering support to help customers maintain production reliability and part quality.
Services can include:
Proactive mold maintenance can help reduce unexpected downtime while protecting the customer’s tooling investment.
Hi-Rel Plastics & Molding can support customers beyond tooling and molding with a broad range of secondary manufacturing.
Depending on the product and program requirements, value-added services may include assembly services, adhesive bonding, heat insertion and heat staking, ultrasonic insertion and ultrasonic welding, pad printing, label application, hot stamping and foil decoration, custom packaging, and filling and sealing .
This allows customers to consolidate mold manufacturing, molding, machining, decoration, joining, assembly, packaging, and finishing with a single manufacturing partner.
Different manufacturing programs have different priorities. Some customers prioritize the shortest possible supply chain, while others require aggressive tooling economics for a new product launch.
Hi-Rel Plastics & Molding offers access to both onshore and offshore mold manufacturing solutions, allowing tooling strategy to be matched to the project’s budget, complexity, schedule, expected volume, and long-term production requirements.
Hi-Rel Plastics & Molding provides project management and engineering coordination throughout the tooling program, including design review, DFM, tool construction oversight, sampling, qualification, engineering changes, and transition into production.
This combination provides customers with the flexibility of global tooling resources together with engineering and production support from a California plastics manufacturer.
Hi-Rel Plastics & Molding’s Quality Management Systems include ISO 13485:2016, ISO 9001:2015, and AS9100 Rev D certification, supporting customers operating in highly regulated and quality-sensitive markets.
Our mold making and plastics manufacturing capabilities serve applications across:
From precision medical tooling and aerospace plastic component molds to consumer product molds and high-volume industrial tooling, each mold is developed around its specific manufacturing requirements.
Choosing the right mold making company or injection mold manufacturer means evaluating more than the initial tooling price. Mold quality influences the entire production program.
Hi-Rel Plastics & Molding offers customers an integrated approach combining:
Customers can work with one manufacturing partner from concept → DFM → prototype → mold design → mold manufacturing → mold sampling → qualification → production → secondary operations → assembly → packaging.
Hi-Rel Plastics & Molding Corp. is headquartered in Riverside, California, providing convenient support for manufacturers throughout Los Angeles County, Orange County, Riverside County, San Bernardino County, San Diego County, and the Inland Empire.
Companies searching for a mold maker in Los Angeles, injection mold manufacturer in Los Angeles, Southern California mold making company, Southern California injection mold manufacturer, plastic mold maker near Los Angeles, or California tooling manufacturer can partner with Hi-Rel Plastics & Molding for tooling development and complete production support.
Our Southern California location provides customers with access to engineering, project management, injection molding, blow molding, LSR molding, thermoforming and vacuum forming, rotational molding, quality, assembly, and contract manufacturing resources while maintaining the flexibility to utilize both domestic and international tooling options.
Hi-Rel Plastics & Molding also serves OEMs and manufacturers throughout Northern California, including the San Francisco Bay Area, Silicon Valley, San Jose, Sacramento, Oakland, Fremont, and surrounding manufacturing regions.
Northern California medical device, biotechnology, electronics, aerospace, semiconductor, industrial, and technology companies can utilize Hi-Rel Plastics & Molding for custom mold manufacturing, injection molding tooling, mold transfers, plastics production, assembly, and turnkey contract manufacturing.
Whether your company is searching for an injection mold maker in Northern California, California mold manufacturing company, custom tooling supplier, or full-service plastics manufacturer, Hi-Rel Plastics & Molding can support programs from product development through production.
Beyond California, Hi-Rel Plastics & Molding provides custom mold making and tooling manufacturing services for customers throughout the United States.
Our combination of tooling engineering, plastics processing technologies, project management, quality systems, and contract manufacturing capabilities enables us to support OEMs seeking a long-term USA plastics manufacturing and tooling partner.
We can support projects ranging from a single custom mold to complex manufacturing programs involving multiple molds, multiple molding technologies, secondary operations, assembly, packaging, and ongoing production.
Customers can also explore Hi-Rel Plastics & Molding’s Resources and technical articles for additional information about plastic molding, materials, tooling, design, and manufacturing.
Custom injection mold manufacturing is the process of designing and building tooling specifically for a customer’s plastic component. The mold typically contains precision-machined cavities and cores that create the geometry of the finished plastic part when molten resin is injected into the tool.
Providing a 3D CAD model is generally the best starting point. Helpful information also includes 2D drawings, plastic material, expected annual quantity, program life, tolerance requirements, cosmetic requirements, color, inserts, assembly requirements, and any applicable quality or validation requirements.
Yes. Design for Manufacturability (DFM) is an important part of tooling development. The objective is to identify potential moldability and manufacturing concerns before substantial investment is made in production tooling.
Mold Flow Analysis can be incorporated when appropriate to evaluate resin flow, filling behavior, gate strategy, weld lines, air traps, pressure, shrinkage, cooling, and potential warpage before tooling is finalized.
Yes. Hi-Rel Plastics & Molding’s tooling capabilities support thermoplastic injection molding, LSR injection molding, EBM, SBM and ISBM blow molding, thermoforming and vacuum forming, and rotational molding.
Yes. Existing molds can be evaluated for transfer into Hi-Rel Plastics & Molding’s manufacturing operation. Tooling may be inspected, sampled, repaired, modified, or refurbished as necessary before production qualification.
Yes. Mold support can include inspection, preventive maintenance, repairs, replacement of worn tooling components, engineering changes, modifications, and refurbishment.
Yes. Hi-Rel Plastics & Molding provides tooling as part of a broader plastics manufacturing capability. Customers can transition from mold design and mold manufacturing directly into injection molding or another applicable molding process, followed by secondary operations, assembly, and contract manufacturing as required.
Whether you need a new injection mold, LSR mold, blow mold, thermoforming tool, vacuum forming mold, rotational molding mold, replacement mold, mold repair, mold transfer, or complete custom tooling program, Hi-Rel Plastics & Molding Corp. can support your project from engineering through production.
Send us your 3D CAD files, drawings, material requirements, estimated annual quantities, and project specifications for review.
Partner with Hi-Rel Plastics & Molding for custom mold making, injection mold manufacturing, tool making, tooling manufacturing, mold design, DFM, Mold Flow Analysis, plastic molding, secondary services, assembly, and turnkey contract manufacturing serving Los Angeles, Southern California, Northern California, California, and customers throughout the USA.
Ready to discuss a new mold, tooling transfer, mold repair, or production program? Contact Hi-Rel Plastics & Molding Corp. to request a quote or discuss your manufacturing requirements.
Hi-Rel Plastics & Molding Corp. — From Mold Design to Production, One Manufacturing Partner.
