MAJOR INDUSTRIES
Founded in 1984, Hi-Rel Plastics & Molding Inc. is a turnkey custom manufacturer specializing in precision plastic injection molding, blow molding, tooling, and value-added secondary services. Based in Riverside, California, the company supports customers across a broad range of demanding industries throughout the United States.
With more than 40 years of experience, Hi-Rel provides complete manufacturing support from part evaluation and prototyping through tooling, mold building, production, assembly, and secondary operations. The company works with a wide range of commodity and engineering-grade thermoplastic resins to manufacture complex plastic components that require tight tolerances, dimensional consistency, and dependable long-term performance.
Hi-Rel Plastics & Molding Inc. offers a diverse range of in-house manufacturing capabilities, including custom injection molding, blow molding, liquid silicone rubber molding, thermoforming, rotational molding, mold manufacturing, rapid prototyping and 3D printing. Additional value-added capabilities include ultrasonic welding, pad printing, hot stamping, heat transfer labeling, custom packaging, and other secondary operations designed to streamline production and reduce lead times.
Quality and consistency remain central to every stage of the manufacturing process. Hi-Rel Plastics & Molding Inc. is certified to ISO 9001:2015, AS9100 Rev D, and ISO 13485:2016 standards, supporting the strict quality requirements of aerospace, medical, military, industrial, scientific, electronics, and consumer product industries.
For applications requiring controlled manufacturing environments, Hi-Rel Plastics also offers ISO Class 7 cleanroom molding capabilities for medical, laboratory, and other high-performance applications.
Built on precision, responsiveness, and long-term customer relationships, Hi-Rel Plastics combines practical manufacturing expertise with hands-on engineering support to help customers move efficiently from concept to full-scale production. The company’s commitment to quality workmanship, dependable service, competitive pricing, and on time delivery continues to drive every project and every customer partnership.
Hi-Rel Plastics & Molding Inc. is a custom manufacturer specializing in plastic injection molding and blow molding for demanding industries across the United States. Since 1984, the company has supported customers through every stage of the production process, from part evaluation and prototyping to tool design, sampling, and full-scale production.
With a reputation built on quality, precision, and dependable service, Hi-Rel Plastics & Molding Inc. works with a wide range of thermoplastic resins and engineering-grade materials to produce complex plastic and metal components for high-performance applications.
For more than 40 years, Hi-Rel Plastics & Molding Inc. has delivered highly precise molded components for industries where consistency and performance matter most. The team combines technical knowledge, practical manufacturing expertise, and hands-on problem solving to create molds and finished parts that meet exact specifications.
From medical and aerospace components to military, scientific, and luxury product applications, Hi-Rel Plastics & Molding Inc. is equipped to manufacture parts with tight tolerances and exceptionally low rejection rates. The company’s commitment to integrity, responsibility, and ingenuity continues to shape every customer relationship and every production run.
We specialize in custom plastic injection molding and blow molding, supporting projects from initial concept through full-scale production. Our capabilities include prototyping, tool design, tool building, sampling, and high-volume manufacturing.
We serve a wide range of industries including medical, aerospace, military, industrial, automotive, and scientific applications. Our team is experienced in producing both highly technical components and precision consumer-facing products.
It depends on the product application, performance requirements, and manufacturing process. For injection molding, we work with a wide variety of materials including ABS, Polycarbonate (PC), Nylon, Acetal, Acrylic, TPU, Polypropylene (PP), and Polyethylene (PE). For blow molding, commonly used materials include HDPE, LDPE, Polypropylene (PP), and PET depending on the design and end-use requirements. We also work with many additional custom and specialty materials based on specific project needs.
Yes. We regularly manufacture components with tolerances as tight as ±0.001 inch, ensuring consistency, performance, and minimal rejection rates for critical applications.
Yes. Our team can assist with product design and development, including creating 3D CAD models based on sketches, drawings, prototypes to ensure optimal design, manufacturability, and cost efficiency before production begins.
Timelines vary based on project complexity, tooling requirements, and volume. However, our streamlined process and experienced team ensure efficient turnaround and reliable, on-time delivery.
We work with engineers, procurement teams, and product designers across a wide range of industries. Here are some of the most common questions we get about our plastic injection molding and manufacturing capabilities.
To start the quoting process, simply contact us through our website contact page. Our team will follow up to request additional information such as a 3D CAD model, drawing, material, quantities, and project details needed to prepare an accurate quote.
Minimum order quantities vary depending on the manufacturing process, material, part size, and project requirements. Our team will review your project details and recommend the most cost-effective production quantity for your application.
We can manufacture a wide range of part sizes depending on the molding process and material requirements. Our injection molding capabilities range up to 900-ton press capacity, allowing us to produce everything from small precision components to large parts approximately the size of a plastic chair.
Yes. We offer tooling storage and ongoing preventive maintenance for molds manufactured by us. Tools are securely stored and insured against risks such as fire, explosion, and earthquake at no additional cost.
Yes. Based on your product application, industry requirements, durability needs, indoor or outdoor use, and cost considerations, our experienced team can help recommend the most suitable material for your project.
Yes. We offer a variety of secondary and custom value-added services including assembly, custom packaging, labeling, pad printing, ultrasonic welding, and other finishing operations to help streamline your production process.
Need help with a project or looking for a manufacturing partner you can rely on? Our team is ready to discuss your requirements and provide expert guidance.
