Overmolding Services

Certifications: IATF16949:2016 | ISO9001:2015

Although in some cases Prototool may recommend you choose our factory’s moldeo por inyección bicolor technology to complete your particular products, we may also recommend overmolding if you have loose deadlines and want to reduce costs.

Overmolding is obviously a very mature injection molding process in the market. Our professional staff will provide you advice according to our nearly 10 years of injection molding experience to make your products competitive in the market.

Por qué elegirnos

High-Quality Standards

From using the best materials to employing efficient workflows, precise measurements, and timely deliveries - we follow strict quality control measures to guarantee that only the highest quality parts are produced.


We use advanced automation procedures and other techniques to make sure that the project remains cost-effective for you, suiting your budget.

Excellent Capacity

We have an efficient and exceptional in-house capacity and capabilities, helping us ensure that your parts are made with top quality industry standards from start to finish.

Quick Turnaround

We ensure faster lead times and quick turnaround with our rapid services. We help you reach the market quicker by shortening lead times to weeks or even days.

How Does Our Overmolding Services Work?

Here is the typical working order to expect when you hire us for our overmolding services:

Enviar solicitud

Submit quote request with a description and technical drawing of your product. In case of no technical drawing, no worries. We can reverse engineer.

DFM y presupuesto

Solemos responderle en un plazo de 24 horas.

Mold-making & Machining

Once you approve the quote and make the deposit, we start working on the mold making and machining process.


Packaged, labeled, and shipped to your door right on time. You can easily reorder the parts from your molding tool.

Find the Best Overmolding Service?

This is where you get it all. Request your free quote today, and enjoy the best overmolding services.

Different Types Of Overmolding Processes

There are different types of overmolding processes, each of which has different applications. Here are some of the most common types of overmolding structures:

overmolding case

Plastic Over Plastic

This involves the molding of a rigid plastic material, which is later overmolded with another rigid plastic. These plastics can be of different colors, structures, and resins.

Rubber Over Plastic

This involves the molding of a rigid plastic material. Once molded, this plastic is then overmolded with soft rubber or TPE.

Plastic Over Metal

First, a metal substrate is machined, cast, or formed. Then, it is inserted into an injection molding tool, and the plastic is molded over or around the metal.

Rubber Over Metal

First, a metal substrate is machined, cast, or formed. Then it is inserted into an injection molding tool, and the rubber or TPE is molded over or around the metal.

Materials Used for Overmolding

We offer a wide range of materials for overmolding projects, depending upon the geometry, complexity, and requirements of your project. These materials can be divided into three different categories, including:

Rigid Plastics


Flexible Plastics

EVA Foam
EPS Foam
PU Foam

Rubber Plastics

Silicon Rubber

overmolding material


We offer multiple finishing options to complete the products made with the overmolding process. You can choose from any of the following depending upon your application’s requirements:

Standard Finish

Interior, non-cosmetic finish according to the geometry of the mold.

SPI Finishes

Range of SPI finishes from Grade 3 diamond / high polish to 320 stone low polish. These Finishing options include SPI A-1, SPI A-2, SPI A-3, SPI B-1, SPI B-2, SPI B-3, SPI C-1, SPI C-2, SPI C-3, SPI D-1, SPI D-2, and SPI D-3.

Threaded Inserts

We can install the most commonly used and popular standard inserts in UNF and metric sizes.

As Molded

As the name suggests, the mold will remain ‘as it is’ – without any secondary texturing or polishing.

Mold Texturing

Creating textures on the molds so that it shows on the final product. This finishing option includes matte, swirls, patterns, and lines.

Laser Engraving

Engrave part numbers, designs, logos, or any other specified printing onto your parts.

Pad Printing

Application of an ink-based design to the surface.


Painting the surface with standard colors or Pantone matching, including Primer and topcoat. Masking available; EMI (copper) paint.
overmolding product

Industry application

Overmolding is used to produce customized parts and components for a wide variety of industry applications, including:

Our Strengths


We offer end-to-end specialized overmolding services to meet your specific design requirements.


From design to final fabrication and packaging, our team of experts will work with you every step of the way to create a tailored solution for your exact needs.

Diverse Material

With a variety of materials available and the precise capabilities of our equipment and facilities, we offer highly customizable overmolding services for all your project needs.

Online quote

We give our customers instant access to a technical team with our online quote system.  Once a quote is submitted online, you will have a response within 24 hours.

What is Overmolding?

Overmolding refers to the manufacturing process of a single part, which is created using two or more different materials in combination with each other. Typically the first material, sometimes called the substrate, is partially or fully covered by subsequent materials, sometimes called the overmold materials, during the manufacturing process. It is when one thermoplastic material is molded over another material to form one integrated part of high-quality and better resistance.

injection molding process

Benefits of Overmolding


Once the mold is created, it can be used repeatedly to create as many parts as possible, making it highly economical. Moreover, overmolding also reduces assembly and labor costs.


It eliminates the need for the bonding step in the manufacturing process, giving a boost to reliability and consistency.

Enhanced Strength

With double strength of two molded parts, the manufactured part has higher durability and a more solid structure.

Accuracy & Efficiency

In higher volumes, overmolded parts preserve a higher precision and less waste than other manufacturing processes.


Custom overmolding allows the production of parts in multiple thermoplastic materials as required by your project and its application.

Better Surface Quality

Improve the aesthetic, strength, and functionality of the components with a combination of different colors and hardness.


Overmolding is a multi-shot injection molding process that produces a single product from two or more different thermoplastics.

The first “shot” is called the substrate, which is typically the more rigid of the two materials being used and is designed to accept the subsequent shots or overmolds. 

Where the substrate is the first material injected into the mold, the overmold is the second. The substrate is designed to accept the overmold onto or around itself. The substrate is typically more rigid than the overmold.

Overmolding refers to the process when plastic is molded over another molded part. The first component is made inside an injection mold, and it is then placed into a second mold to add the over-molded material. On the contrary, Insert molding refers to combining other parts, particularly metal parts, directly into the injection-molded product.

Depending on size and complexity, we take from 4 to 12 weeks generally to complete an overmold project.

Simply upload your product details and/or CAD files, and we will send you a free quotation within 48 hours or even less.

There is no need to worry. You can just provide us with a description, and we can reverse engineer it to reach your product ourselves.