LSR Overmolding Solution Provider

With over 8 years of expertise in LSR overmolding technology, Henry Precision provides over-molding services for a wide range of consumer products and life science applications.

Henry-precision’s LSR/plastic overmolding processes create parts specifications as tight as 0.001”. We utilize the most advanced injection molding equipment for overmolding to ensure the highest possible quality and superb repeatability. Different types of overmolding injection molding we provide include:

Plastic over metal
Silicone Rubber over metal
Plastic over plastic
Silicone Rubber over plastic

LSR OVERMOLDING - EVERYTHING YOU NEED TO KNOW

What Is LSR Overmolding

The overmolding process involves creating a single part using a combination of two or more plastic or elastomer materials. During the plastic overmolding process, the base layer part is molded first, then the additional plastic layer(s) are molded over and around the original part. One or more plastic resins may be used depending on material compatibility to achieve a specific texture or look.

Overmolding is used for a range of applications including medical, automotive, military and more. A common example of injection overmolding is a toothbrush with a stiff frame and rubberized grips on the handle. Different overmolding material options are also used to add color contrast for aesthetics or to create flexible areas on rigid components.

Benefits of LSR overmolding

Save Time and Money– When we mold silicone directly onto metal or plastic parts, we cut out many assembly steps that used to be done by hand. This means you can make your products faster and spend less on manufacturing, helping you bring them to market sooner and at a better price.
Build Better Products– This silicone rubber molding process works great for making complex parts, especially for cars and medical devices. When silicone rubber are overmolded onto other materials, you get parts that keep water out, don’t leak air, and handle shocks and vibrations better than traditional components.
Make Parts with Precision– We can make these LSR overmolded parts exactly to your specifications in class 100k clean rooms. While overmolding is challenging and requires extremely precise measurements, it produces high-quality parts consistently. The process ensures excellent control over how each part turns out.

Our Overmolding Process

Applications of LSR Overmolding

LSR over-molding is used for a range of applications including medical, automotive, electronics, and more. Our research into silicone over-molding extends to food-grade and medical-grade silicone for use such as baby pacifiers that are designed for direct contact with food or the mouth.

MEDICAL DEVICE

NEW ENERGY AUMOTIVE PARTS

3C DIGITAL PRODUCTS

AUDIO PRODUCTS

HIGH-END BATHROOM PRODUCTS

What Material Combinations Can You Use for Overmolding

Overmolding is a process that often used to create a textured or comfort grip surface on metal components so an initial part of the material selection process is reviewing different material properties to see which will produce the desired results. This become a bit trickier when using more than one material because material properties can change when two or more resins are combined.

Compatibility is key for the overmolding process, so there may be some limitations as to which overmolding material combinations you can use. There are also important considerations regarding thickness effects, hardness, and coefficient or friction to ensure compatibility between lsr overmolding materials.

We have extensive knowledge of LSR/plastic materials including thermoplastics and exotic resins to help you select the right materials for your specific part. Some of the more common materials used for injection overmolding are:

ABS	A common and versatile plastic that provides good resistance heat, oils, acids and alkalis. Other features include high impact strength and toughness, good dielectric properties, excellent ductility and ability to be alloyed with other polymers.
PEEK	This high-performance plastic provides high chemical and temperature resistance without degradation and provides excellent fatigue and stress-crack resistance. It is FDA-approved and suitable for use in medical device applications.
Acrylic Thermoplastics	Provide excellent weather ability and resistance to UV fading. They feature high tensile strength and are scratch-resistant. Acrylics are also available in FDA-approved grades for use in food and medical applications.

Our expertise in LSR technology ensures optimal material selection and processing parameters for your specific requirements. Contact our professional team to get your best material choice for LSR over-molding.

LSR Overmolding vs. Insert Molding

	LSR Overmolding	Insert Molding
Process	Applies one material over another, creating a seamless multi-material part.	Encases pre-formed components (e.g., metal inserts) in plastic.
Material Integration	Combines materials for added grip, aesthetics, or functionality.	Adds strength or functionality by integrating rigid components.
Applications	Used for ergonomic grips, dual-material parts.	Common for reinforced housings, threaded components.

Custom LSR Overmolding Solutions from Henry Precision

- We Provide Custom LSR Overmolding Solutions

Henry-precision specializes in LSR overmolding technology, ensuring the success of your projects through our comprehensive expertise. We guide you through every phase from initial design to final production, providing technical support and troubleshooting solutions throughout the process.

Since the materials we use shrink as they cool following the overmolding process, special considerations are made during the tooling development process to accommodate for changes in dimensional tolerance. Our mold designers will perfectly match their mold specs to the unique needs of your overmolding project. And because we use several different materials in overmolding with different cooling/shrinking properties, we create our molds to match the specific properties of the materials being used.

The variety of materials we use, the precise capabilities of our equipment, and our mold design services make our overmolding process extremely customizable. Our state-of-the-art LSR processing equipment, combined with expert mold design capabilities, allows us to offer highly customizable solutions. Whether you need:

Complex medical device components
High-precision automotive parts
Consumer electronics with water-resistant seals
Custom industrial components

Henry-precision tailors each LSR over-molding solution to meet your exact specifications. No matter what your project specifications are, and how low or high-volume your production run will be, Henry-precision will meet, even exceed the expectations of your next over-molding project.

Ready to explore LSR overmolding solutions? Contact our team to discuss your project requirements.

Cases

Explore our overmolding projects across medical, automotive, consumer electronics, and other applications.

Cases

Precision Molding and LSR Injection for Atomizer Shells

Overview of the Atomizer Aluminum Alloy Shell Project In this case study, we will explore how we used liquid silicone rubber (LSR) injection molding and precision mold design to produce high-quality atomizer aluminum alloy shells. The project involved several key challenges, including ensuring biocompatibility, durability, and aesthetic quality of the final product. Let’s dive into how we approached the project, from design to production. Key Challenges in Producing Atomizer Shells Aluminum Alloy Coating for Corrosion Resistance The aluminum alloy shells required superior corrosion resistance, especially for skin-contact applications. The solution was to apply a high-performance coating to the aluminum to

Solving Medical Mask Production Challenges with Innovative Materials

Challenges in Medical Mask Production In medical-grade product production, especially for breathing masks, functionality, safety, and durability are critical. Henry Precision faced several challenges in designing medical masks using Covestro PC-2458 (a high-temperature-resistant polycarbonate) and JAPEN Shin Etsu2090-40 (liquid silicone rubber, LSR). These materials meet FDA’s biocompatibility requirements and provide the necessary support, sealing properties, and performance. Material Compatibility and Bonding Issues Bonding liquid silicone to plastic components is essential for maintaining structural integrity. The high fluidity of liquid silicone can cause gas traps, degumming, and non-stick defects. To address this, the adhesive process had to ensure a strong, reliable

High-Performance Sealing Rings for Medical Devices

In the production of sealing rings for medical devices, maintaining precision and ensuring high-quality performance is crucial. Henry Precision recently encountered several challenges while manufacturing a sealing ring with WACKER 3038-70 silicone material. The product’s small size, internal instability, and complex structure required advanced design, meticulous attention to detail, and high-precision mold processing. Challenges Internal Size InstabilityThe sealing ring had a relatively small internal size, which was prone to instability. This caused issues such as partial silicon filling, leading to potential quality defects. The solution required careful mold design and machining precision to ensure stable production. Multiple Cavities and

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Partner with Henry-precision to Experience:

Premium LSR Overmolding Excellence

Advanced in-house tooling for precise LSR over-molded components
Flash-free production with minimal waste
Streamlined manufacturing requiring no post-processing
Specialized cold runner systems for optimal material control

Advanced Manufacturing Capabilities

State-of-the-art automated production facilities
High-precision injection molding systems
Integrated quality control processes
Industry-leading 6S management implementation

Expert Technical Support

In-house mold design and fabrication expertise
30+specialized technical professionals
Customized R&D solutions
Comprehensive project support from concept to production

Let’s build the future with innovation.

Please provide the following details to help us better understand your needs and get in touch with you as soon as possible.

You can send us 3D drawings in STL, STEP, IGES and 2D drawings in PDF. We will provide accurate quotations within 24 hours.

From concept to completion, we provide a one-stop silicone mold manufacturing service.

LSR Overmolding Solution Provider

LSR OVERMOLDING - EVERYTHING YOU NEED TO KNOW

What Is LSR Overmolding

Benefits of LSR overmolding

Our Overmolding Process

DFM Analysis

Mold Design

LSR Overmolding

Quality Inspection

Delivery & Technical Support

Applications of LSR Overmolding

What Material Combinations Can You Use for Overmolding

LSR Overmolding vs. Insert Molding

Custom LSR Overmolding Solutions from Henry Precision

- We Provide Custom LSR Overmolding Solutions

Cases

Precision Molding and LSR Injection for Atomizer Shells

Solving Medical Mask Production Challenges with Innovative Materials

High-Performance Sealing Rings for Medical Devices

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Partner with Henry-precision to Experience:

Let’s build the future with innovation.

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+86 189 3871 2136

enquiry@henry-precision.com

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