Hi-Rel Plastics provides liquid silicone injection molding for medical devices, aerospace, electronics, and other precision applications. From tooling to production, we mold flexible, durable silicone components with the quality, consistency, and compliance your project demands.
Hi-Rel Plastics & Molding Corp. provides liquid silicone rubber (LSR) injection molding alongside a full range of precision plastic manufacturing services. From part evaluation and prototyping to tooling, molding, assembly, and production, we support every stage of your silicone component program with quality and consistency.
With more than 40 years of experience, we partner with manufacturers in Riverside and across the United States to produce complex components in ISO-certified environments for highly regulated industries.
Hi-Rel Plastics & Molding Corp. is a trusted liquid silicone injection molding partner for customers across the United States. We produce precision LSR components such as seals, gaskets, valves, diaphragms, and soft-touch parts for applications where flexibility, heat resistance, and long-term performance are essential.
Liquid silicone rubber holds its shape and properties across extreme temperatures, resists chemicals and moisture, and can be formulated for biocompatibility. Backed by ISO 13485, ISO 9001:2015, and AS9100D certifications, we combine molding expertise with rigorous quality systems to deliver reliable, repeatable silicone parts.
From prototype through full-scale manufacturing, Hi-Rel partners with customers nationwide to deliver dependable liquid silicone molding solutions for critical industries.
Molded under certified quality systems built for medical, aerospace, and other regulated applications.
Produces repeatable, high-quality silicone components with fine detail and complex geometries.
Flexible parts that hold up to heat, cold, chemicals, and sterilization.
Supporting low and high volume LSR programs with expert engineering from concept through delivery.
Whether you’re designing a new silicone component, moving a part to LSR from another material, or searching for a reliable molding partner, our team is here to help. Below are answers to common questions about our liquid silicone injection molding capabilities and process.
Liquid silicone injection molding, also called LSR molding, injects a two-part, platinum-cured liquid silicone into a heated mold where it cures into a solid, flexible part. It's well suited for precise, repeatable production of durable elastomer components.
LSR is commonly used for seals, gaskets, O-rings, valves, diaphragms, keypads, soft-touch grips, and medical device components. If your part needs to flex, seal, or stand up to heat, LSR is often a strong fit.
LSR offers excellent heat and cold resistance, chemical resistance, low compression set, and consistent quality across high-volume runs. It can also be formulated for biocompatibility and holds up to common sterilization methods.
Medical-grade LSR materials are available that meet FDA and biocompatibility requirements. Our team can help you select the right silicone grade based on your application and regulatory needs.
Hi-Rel Plastics is certified to ISO 13485, ISO 9001:2015, and AS9100D, supporting medical, aerospace, defense, and other quality-critical manufacturing programs.
Yes. We support silicone projects from part evaluation and prototyping through mold design, tooling, production, and assembly to help streamline development and time to market.
Production timelines vary based on part complexity, tooling, silicone grade, and order volume. Our team will provide a detailed schedule during the quoting process.
To begin, contact our team with your project details, including CAD files or drawings, silicone grade or hardness (durometer) requirements, estimated quantities, and application information. We'll review your project and prepare a detailed quote.
Minimum order quantities depend on part design, tooling, material selection, and project requirements. Contact us to discuss the best production plan for your liquid silicone molding project.
Yes. Hi-Rel Plastics is based in Riverside and partners with manufacturers throughout the Inland Empire, Southern California, and across the United States.
