An Overview of Overmolding

An Overview of Overmolding

By moulding two or more materials (typically a rigid plastic and a rubber-like elastomer) together, a non-slip, soft touch surface is produced, which is common on everyday products like toothbrushes, power tools, medical devices, razors, and consumer electronics. This process, known as overmolding, offers a unique feel and look for consumer products like those listed above. 

An overmolded piece is first created with the molding of a rigid, thermoplastic substrate. This substrate is molded to a thermoplastic elastomer (TPE) and through either multi-shot or insert molding, these two are connected. Multi-shot molding allows the TPE to become overmolded instantly after the molding of the substrate.

It accomplishes this by spraying numerous materials in a single procedure on an injection molding press. Insert molding, on the other hand, is a two-step procedure. After the rigid substrate is molded, it is positioned in a mold cavity on a separate injection molding machine and TPE is sprayed directly over the substrate. 

Which method is selected varies with differing factors, which include: part designs, tooling costs and production volumes. To overcome issues that surface when designing an overmolded product, companies depend on a number of differing prototyping methods. 

Method 1: Prototype Injection Molds 

Taking 3-8 weeks to complete and with a cost ranging between $6,000 and $50,000 (depending on size and detail), prototype injection mold is the ideal rapid prototyping method. Although it is costly and time consuming, the final overmolded prototype boasts the same qualities as the final product. 

Method 2: RTV Molds 

Costing $1,000 to $5,000 and taking usually 1-3 weeks to complete, the RTV molding process uses one compound to form the base constituent and a separate, different compound for the overmolded area. Each of these molds demands a cast for the liquid silicone rubber to be poured into. 

Why Connex?

Over the last five years the Connex 3D Printing Systems has separated itself from the competition using its truly unique technology and capabilities. “Jetting” multiple compounds allows for overmolding in one simple building procedure. Using industry leading technology also allows each model to be created with unparalleled quickness, accuracy and affordability. It is quickly replacing both RTV and injection molding in rapidly producing prototypes.

About Us

Here at Proto3000, we offer you any various 3D Engineering Solutions. We serve any North American location. Our services include: 3D Engineering Design, 3D Laser Scanning, 3D Printing and Rapid Prototyping and Reverse Engineering solutions and services. Through each of these services, our first priority is maintaining professional customer service. Each of our professionals maintains a high level of expertise to ensure success, a friendly experience and high quality service.

Our team of Mechanical Engineers and Mechanical Engineering Technologists use the latest and greatest 3D Engineering Software. This allows us to be innovative, strategic and adaptable. Our passion is evident in all our work and we are relentless and talented at what we do. Our competitive prices combined with industry leading and latest technology never fail to deliver success and quality to our clients. By creating prototypes quickly, you will not only save great amounts of time, but you will be able to alter your design to remove flaws. Our ready-to-use, durable prototypes will help save you money during the research and development stage of any project.



Our mission is to help develop world-class, industry leading products. We can take any idea and apply our expertise and extensive research and development to create and enhance products sold worldwide.



Using our creativity, we want to help pioneer ideas and perfect prototypes for our customers. By being diverse in all aspects of our business, we are committed to enhancing your experience in any way. Our industry leading design, technology and capabilities allow us to best serve you. We want to continue to lead the design and prototype industry while creating new solutions and improving old ones.



Our ultimate measure of success is customer satisfaction. Recent surveys show our aptitude, dedication and success in this category. Our devotion leads us to go above and beyond customer expectations as we value reliability and confidence in our services. As a member of the Canadian Manufacturers & Exporters, as well as the Vaughan Chambers of Commerce, we receive acclamation from all across North America.



Quality is at the core of our growing reputation. As individuals and as a corporation, we expect excellence. Determination is an essential requirement for our success. We are devoted to continued progress in all aspects of our operation.

Your satisfaction is necessary to our success. Our goal is to provide you with the best level of customer service, and we welcome your comments and suggestions.

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