Position：Home

Video display

Plastic Injection Molding
Plastic Injection Molding

Plastic Injection Molding

Insert molding
Insert molding

Insert molding

Overmolding
Overmolding

Overmolding

Liquid silicone rubber molding

Liquid silicone rubber molding

Our custom injection molding services
Our custom injection molding services

Our custom injection molding services

Plastic Injection Molding

Plastic injection molding is a precision manufacturing process that transforms liquid plastic resin into durable, high-quality parts. Perfect for high-volume production and intricate designs, it’s the go-to solution for industries like automotive, consumer goods, and electronics. From prototypes to mass production, we deliver speed, accuracy, and reliability.

Insert Molding

Insert molding combines plastic with pre-installed inserts—like metal or electronic components—to create strong, multi-functional parts. This process enhances durability, reduces assembly steps, and is ideal for applications in medical devices, automotive, and electronics. Let us help you simplify your design and improve performance.

Overmolding

Overmolding bonds multiple materials into a single, seamless component, perfect for ergonomic handles, soft-grip surfaces, and multi-functional parts. This process enhances comfort, durability, and design flexibility, making it a top choice for consumer products, tools, and industrial applications.

Liquid Silicone Rubber Molding

Liquid silicone rubber (LSR) molding creates flexible, heat-resistant, and biocompatible parts ideal for demanding applications. From medical devices to automotive seals, LSR offers unmatched durability and precision. Our advanced LSR molding process ensures high-quality results for even the most complex designs.

Our custom injection molding services

Plastic Injection Molding Service

Injection molding is a manufacturing process that consists of filling a metal mold cavity with liquid plastic resin, which then cools and forms a plastic part.

Insert molding

A manufacturing process in which a part is molded around a pre-installed insert in the tooling.

Overmolding

A manufacturing process in which one plastic material is molded over another to create a single component.

Liquid silicone rubber molding

A thermoset process that involves mixing a two-part solution together to produce flexible and durable parts.

Satisfied Customers

We are still keeping good and lasting relationships with these customers

MERCKphilipsaudimagnaWhirlpool

Applications and Advantages
of Injection Molding

Rapid PrototypingProduction PartsRange of Industries and Certifications

Rapid Prototyping

Speed up your product development with our rapid prototyping services! Using low-cost tooling, we deliver high-quality injection molded parts in as fast as 10 business days. Perfect for testing designs and validating concepts, our affordable solutions ensure precision, speed, and reliability - helping you bring ideas to market faster.

Production Parts

From low-volume runs (250 units) to mass production (over 1,000,000 units), our injection molding services deliver unmatched quality and efficiency. Plastic injection parts outperform machined or 3D-printed alternatives, offering superior strength, functionality, and intricate details. With CNC-machined molds and expert resin selection, we ensure high-tolerance parts tailored to your exact needs.

Range of Industries and Certifications

We serve a wide range of industries, backed by certifications like ISO 9001, AS9100, ISO 13485, UL, ITAR, and ISO 7 & 8 Medical Clean Room molding. Whether it’s aerospace, medical devices, or consumer products, our commitment to quality and compliance ensures your project meets the highest standards.

Why Use HLH Injection

Moulding Services?

Endless Options

With millions of possible combinations of materials, finishes, tolerances, markings, and certifications, we offer unmatched flexibility for your injection molding needs. Whether you need a specific material property, a unique finish, or industry-specific certifications, we’ve got you covered. Your vision, our expertise—let’s create something extraordinary.

Easy to Use

Simplify your production process with our hassle-free service. From design to delivery, we handle everything—sourcing, project management, logistics, and shipping. Your parts will arrive right at your door, ready to use. Focus on your business, and let us take care of the rest.

Vetted Network

Quality and reliability are at the core of what we do. As an ISO 9001:2015, ISO 13485, and AS9100D certified provider, we work with only the top-tier suppliers who meet our rigorous standards. Trust us to deliver precision, consistency, and compliance for every project.

Injection molding materials

Injection molding uses a huge range of plastics, making it ideal for many applications across nearly every industry. we can source thousands of materials on request.

Acrylonitrile Butadiene Styren (ABS)

Acrylonitrile Butadiene Styren (ABS)

Polymethyl Methacrylate (PMMA)

Polycarbonate (PC)

Polycarbonate (PC)

Polyethylene (PE)

Polypropylene (PP)

Polypropylene (PP)

Polyamide 6 (PA6)

Polyether Ether Ketone (PEEK)

Polyether Ether Ketone (PEEK)

Polyoxymethylene (POM)

Custom Injection Moldings Design Guidelines

Feature

Tip

Undercuts

Minimize undercuts to simplify tooling and reduce costs. Use pass-thru coring to avoid complex ejection mechanisms and streamline manufacturing processes.

Wall Thickness

Maintain uniform wall thickness to prevent sinks and voids. Opt for thinner walls to decrease cycle time and lower production costs, ensuring consistent and efficient molding.

Draft Angles

Design parts with a draft angle of at least 0.5° for smooth ejection, and up to 5° for surfaces with medium textures, improving mold release and part quality.

Ribs and Gussets

Keep ribs at 40-60% of the outer wall thickness while maintaining proper draft angles. This ensures strength without compromising the integrity of the mold or part design.

Bosses

Design bosses with a depth of 30% of wall thickness and include a 30% edge groove for optimal strength. Connect bosses to side walls or ribs to enhance structural durability.

Tooling - prototyping vs production

Prototyping

Ideal for rapid prototyping and low-volume production

1:Tool shot life – 1k to 100k units

2:Fast turnaround and cost-efficient construction

3:Aluminum or steel

Prototyping

Production

Longer-lasting tooling for larger volumes

1:Tool shot life – 100k to 1M units

2:Automated production for cost-efficiency at higher volumes

3:Hardened steel for longer life and a scalable unit price

Low Production

RELATED SOURCES

Insert molding
Insert molding
Overmolding
Overmolding
Liquid silicone rubber molding
Liquid silicone rubber molding

Testimonials

Amazing experience. All the expectations fulfilled. Exceptional quality and surface finish. Lead time faster than initially stated.

Amazing experience. All the expectations fulfilled. Exceptional quality and surface finish. Lead time faster than initially stated.

-------------STEVEN JAWORSKI

I think HLH is a very customer friendly service, easy to understand the costs and build limitations. The best part for me is the ease of which I can turn ideas around into something I can sell, which I can use to fund my next project.

I think HLH is a very customer friendly service, easy to understand the costs and build limitations. The best part for me is the ease of which I can turn ideas around into something I can sell, which I can use to fund my next project.

------------YONATAN ASSOULINE

HLH has always given us exactly what we needed. We’ve received parts with holes in the right places, with the right finish, and on time. Their user-friendly website means faster turnaround.

HLH has always given us exactly what we needed. We’ve received parts with holes in the right places, with the right finish, and on time. Their user-friendly website means faster turnaround.

----------------Jackson Siu