Hi-Rel Plastics & Molding

What Hi-Rel Plastics & Molding does

Hi-Rel Plastics & Molding Inc. is a privately held custom plastic manufacturer founded in 1984 and headquartered at 7575 Jurupa Ave, Riverside, California. The company operates as a single-site, B2B contract manufacturer with 11-50 employees, serving OEMs and Tier 1 suppliers across medical, aerospace and defense, automotive and electric vehicles, industrial equipment, electronics, pharmaceutical, cosmetics, sustainability/renewable, agriculture, and construction end-markets in the United States. Its go-to-market is enterprise-direct, with sales initiated through website quote forms, phone outreach, and long-running OEM relationships, supported by content marketing, design guidelines, and LinkedIn/Facebook/Instagram brand presence.

The company's core technology stack comprises eight in-house molding processes — injection molding (presses up to 900 tons, including vertical, insert, overmolding, and multi-shot), blow molding (EBM/ISBM/IBM with 200-point parison programming, 1 mL to 7-gallon capacity), liquid silicone rubber molding (10-80 Shore A), thermoforming, rotational molding, ISO Class 7 cleanroom medical molding, and 3D printing/rapid prototyping — backed by in-house mold design, tooling fabrication, and preventive maintenance. Tolerances as tight as ±0.001 inch and certification to ISO 9001:2015, AS9100 Rev D, and ISO 13485:2016 underpin its positioning in regulated, high-reliability applications. The portfolio is rounded out by twenty secondary services, including assembly, adhesive and ultrasonic welding, coil winding, CNC machining of plastics and metals, surface treatment (EMI/RFI shielding, UV coatings), filling/sealing, custom packaging, hot stamping, pad printing, and labeling.

Hi-Rel generates revenue through quote-based, project-priced contracts spanning tooling build (one-time, including domestic and offshore options), prototype-to-production runs (one-time and recurring), and secondary value-added services. Pricing is not publicly disclosed; minimum order quantities and tool/lead-time estimates vary by process, material, and complexity, with long-term JIT/Kanban programs supporting repeat volume. The company has no disclosed funding events, M&A activity, parent entities, or named institutional ownership, and operates as a founder/management-controlled private corporation with no subsidiaries.

Name

Hi-Rel Plastics & Molding

Legal name

Hi-Rel Plastics & Molding Inc.

Website

https://hirelplastics.com

Company type

Private

Founded year

1984

Operating status

Operating

Headcount range

11–50 employees

Short description

Hi-Rel Plastics & Molding is a Riverside, California-based custom plastic manufacturer offering precision injection, blow, LSR, thermoforming, rotational, cleanroom, and 3D-printed molding with in-house tooling, serving medical, aerospace, automotive, industrial, and electronics OEMs.

Ownership category

akta.pro rank

Product category

Custom Plastic Manufacturing

NAICS

Plastics Product Manufacturing (3261), Other Plastics Product Manufacturing (32619), Plastics and Rubber Products Manufacturing (326)

SIC

Plastics Products, Nec (3089), Miscellaneous Plastics Products (3080)

akta.pro industry

PRIMARYIMANAFAJ

Custom Injection Molding & Contract Manufacturing (Job Shops/CMs)

Industrials, Manufacturing & Construction/Plastics & Rubber Manufacturing/Injection-Molded Plastics Manufacturing

SECONDARYIMANAFAC

Medical & Life Sciences Injection Molding (Devices, Diagnostics, Cleanroom)

Industrials, Manufacturing & Construction/Plastics & Rubber Manufacturing/Injection-Molded Plastics Manufacturing

SECONDARYIMANAFAI

Insert & Overmolding (Metal/Plastic, Multi-Material)

Industrials, Manufacturing & Construction/Plastics & Rubber Manufacturing/Injection-Molded Plastics Manufacturing

SECONDARYIMANAGAF

Blow-Molded Industrial Containers & Crates (Non-packaging)

Industrials, Manufacturing & Construction/Plastics & Rubber Manufacturing/Blow-Molded Plastics Manufacturing

SECONDARYIMANAOAG

Injection-Molded Plastics Manufacturing

Industrials, Manufacturing & Construction/Plastics & Rubber Manufacturing/Additive Manufacturing (3D Printing of Plastics)

Keywords

• Precision injection molding
• Custom plastic manufacturing
• Cleanroom medical molding
• Mold and tool making
• Blow molding services

Headquarters

HQ city

Riverside

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Operations, Supply Chain, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. Custom Plastic Manufacturing Services: Revenue generated from providing custom plastic injection molding, blow molding, LSR molding, thermoforming, and rotational molding services. Pricing is quote-based and varies by project complexity, material requirements, production volumes, and tooling needs.
2. Mold and Tool Making Services: Revenue from in-house mold design, tooling fabrication, and ongoing maintenance. Domestic (onshore) and international (offshore) tooling solutions available with complete project management.
3. Secondary Services: Value-added services including assembly, adhesive bonding, ultrasonic welding, CNC machining, hot stamping, pad printing, labeling, custom packaging, and surface treatment enhance revenue from core manufacturing.
4. Rapid Prototyping and 3D Printing: Revenue from rapid prototyping, 3D printing, and design validation services enabling seamless transition to injection molding or blow molding production.

Pricing tiers

Go-to-market motion2 records

Distribution channels2 records

Marketing channels5 records

Core offering

Hi-Rel Plastics & Molding is a custom precision plastic manufacturer providing injection molding, blow molding, liquid silicone rubber molding, thermoforming, rotational molding, and 3D printing/rapid prototyping services, supported by in-house mold design and tooling plus secondary operations such as assembly, machining, welding, and packaging. The company serves OEMs and Tier 1 suppliers across medical, aerospace, automotive, industrial, electronics, and consumer industries, producing tight-tolerance components in ISO Class 7 cleanroom environments where required.

Product overview

Hi-Rel Plastics & Molding Inc. is a full-service custom plastic manufacturer offering a comprehensive portfolio of precision manufacturing capabilities. The core offerings include eight primary manufacturing processes: 3D Printing/Rapid Prototyping, Mold & Tool Making, Injection Molding, Cleanroom Medical Molding, Blow Molding, Liquid Silicone Rubber (LSR) Molding, Thermoforming/Vacuum Forming, and Rotational Molding. These manufacturing services are supported by a comprehensive suite of twenty secondary/value-added services including Adhesive Bonding, Assembly Services, Coil Winding, Custom Packaging, Filling & Sealing, Heat Insertion/Heat Staking, Hot Stamping Foils, Label Application, Pad Printing, Plastics & Metal CNC Machining, Surface Treatment & Enhancements, Ultrasonic Insertion/Ultrasonic Welding, and Heat Transfer Labels. The company serves demanding industries including medical, aerospace, automotive, industrial, electronics, and consumer products, supporting customers from part evaluation and prototyping through tooling, production, assembly, and secondary operations.

Differentiator

Problem solved

Functional benefit

Products and services

• 3D Printing / Rapid Prototyping Additive manufacturing service that produces three-dimensional components by building material layer by layer from a digital CAD model, enabling rapid production of complex geometries, functional prototypes, and pre-production parts for OEMs across medical, aerospace, automotive, and industrial sectors.
• Mold & Tool Making In-house design, engineering, fabrication, and maintenance of precision molds, dies, fixtures, and tooling used for injection molding, blow molding, thermoforming, and rotational molding, with domestic and offshore tooling options.
• Injection Molding High-precision injection molding service for complex and tight-tolerance plastic components, supporting press sizes up to 900 tons with capabilities including single-shot, multi-shot, overmolding, insert molding, and vertical injection molding.
• Cleanroom Medical Molding ISO Class 7 (Class 10,000) cleanroom injection molding for medical, pharmaceutical, and life sciences applications requiring strict contamination control and regulatory compliance under ISO 13485:2016.
• Blow Molding Manufacturing process producing hollow plastic parts by extruding or injecting a molten plastic tube (parison) and inflating it with compressed air, supporting EBM, ISBM, and IBM processes for containers from 1 mL to 7 gallons.
• Liquid Silicone Rubber (LSR) Molding Precision injection molding process for flexible, high-performance elastomeric components with durability, biocompatibility, and environmental resistance, supporting 10 to 80 Shore A durometer hardness.
• Thermoforming / Vacuum Forming Manufacturing process that heats thermoplastic sheets until pliable, then forms them over a mold using vacuum pressure or mechanical force, supporting sheet thicknesses from 0.010 to 0.060 inches.
• Rotational Molding Manufacturing process that produces hollow, seamless plastic parts by heating and rotating a mold filled with powdered thermoplastic material, ideal for large, complex parts with uniform wall thickness.
• Assembly Services Complete product assembly services integrating individual molded and purchased components into finished products or functional sub-assemblies using mechanical fastening, adhesive bonding, soldering, and wiring integration.
• Plastics & Metal CNC Machining Precision CNC machining services for prototypes, low-volume production, tooling components, and custom parts using CNC milling and turning for both plastic and metal materials.
• Custom Packaging Custom packaging services including bag packaging, clamshell packaging, sealed foil bags, foam protective packaging, custom cartons, and header cards tailored to product size and branding.

Quantifiable outcome

• Tolerances as tight as ±0.001 inch with extremely low rejection rates
• +2 more outcomes

Segments10 records

Ideal customer profiles4 records

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature7 records

Scale indicators5 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Mack Molding: Custom plastics manufacturer with injection molding, blow molding, and contract manufacturing capabilities serving medical and industrial customers. Comparable end-market focus and full-service molding model.
• Tessy Plastics: Custom plastic injection molding and contract manufacturer with significant medical device exposure and cleanroom capabilities. Comparable to Hi-Rel in regulated-industry contract manufacturing.
• EVCO Plastics: Custom injection molding and contract manufacturing firm serving medical, industrial, and consumer markets. Closely comparable to Hi-Rel in offering multi-process custom molding with engineering support and tooling services.
• Plastic Molded Concepts (PMC): Custom injection molder providing design, tooling, molding, and assembly services to medical, industrial, and electronics OEMs. Directly comparable custom molding offering and customer base.
• Viking Plastics: Custom injection molding and contract manufacturer specializing in tight-tolerance components for automotive, medical, and industrial customers. Comparable precision molding focus.
• Crescent Industries: Custom injection molder and contract manufacturer with in-house tooling, automation, and medical/aerospace certifications. Closely matches Hi-Rel's certified, multi-process contract manufacturing profile.
• Protolabs: Digital manufacturer offering rapid prototyping, injection molding, and CNC machining. Comparable to Hi-Rel on custom plastic manufacturing and quick-turn prototyping, though scaled via proprietary software platform.
• R&D Molders: Custom injection molding company offering design, prototyping, tooling, and production for medical, aerospace, and industrial markets. Similar vertically integrated custom molding model.

Broad incumbents

• Phillips Plastics (Phillips-Medisize): Large-scale contract manufacturer specializing in medical device and pharmaceutical plastics, with cleanroom molding and assembly. Comparable to Hi-Rel on medical plastics focus, but materially larger and more diversified.
• Hoerbiger: Global industrial group with precision plastic and elastomer components for automotive, aerospace, and process industries. Comparable in precision plastics for demanding industries, but operates at much larger scale across many product categories.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks5 records

Key highlights6 records

Customer concentration

• Facebookfacebook.com/profile.php?id=100079889214264
• LinkedInlinkedin.com/company/hi-rel-plastics-molding-inc
• Instagraminstagram.com/hirelplastics
• Xx.com/hirelplastics

Compliance4 records

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Hi-Rel Plastics & Molding