ST uses the latest technology available for the manufacture of rubber and plastic molds.

Mold Flow uses 3-D part geometry to analyze the part design to determine gate size and placement, the design of the runner, and to predict the location of knit lines for proper venting.

Over molding

What is overmolding

By combining two or more materials, overmolding is a manufacturing process that facilitates the creation of a unified, integrated product. Typically, the procedure commences with the molding of a substrate or core material, followed by the molding of a subsequent material, which is generally a softer or distinct substance, over the preceding material. The ultimate outcome is a cohesive and unified product. It is composed of numerous materials, every single one of which fulfills a distinct function.

The principal objective of employing the overmolding process is to improve the aesthetics, functionality, or overall performance of a product. This is achieved through the integration of diverse material properties in specific regions of the product. This process is readily employed in the manufacturing of an extensive range of consumer goods, electronic devices, medical devices, and industrial components.

Advantages of OverMolding

Overmolding is a technique that creates a seamless and integrated product by deforming one material onto another, usually a base or pre-existing component. Because of all the benefits it offers, this method is quickly becoming the norm in many fields. The best parts of overmolding will be discussed in this article. The factors that have led to this production method’s rising popularity among companies will also be investigated.

It is possible to improve an object’s practicality and aesthetics by overmolding it. There is a huge benefit to this. Manufacturers can improve the quality of their products by combining different materials. This leads to better insulation, increased grip, and durability. This allows for the creation of products that are more adaptable and unique, meeting the needs of customers more effectively.

Overmolding, an additional benefit of this process, can help save costs. Integrating various materials into one manufacturing process allows companies to streamline production by reducing the number of steps needed to make a product. In the long run, this might help the business save money on production costs. Further cost reduction and improved process efficiency are achieved by overmolding because it eliminates the need for additional operations like finishing or assembly. A couple of examples of secondary operations are assembly and finishing.

Because of this, complex shapes and structures can be made, even ones that would be difficult or impossible to achieve using more traditional methods. Because it allows for the creation of complex shapes and structures, overmolding gives designers more freedom in their work. Products will be able to stand out in the market and pique consumers’ interest if this phenomenon leads to designs that demonstrate increased comfort and creativity.

Additionally, overmolding may improve the product’s functionality and durability. Enclosing sensitive components or adding protective layers can help manufacturers make their products last longer and last better. Consequently, this makes the products more reliable and less likely to fail. The number of refunds and warranty claims could go down and customer satisfaction and loyalty could go up if this happens.

Overmolding has many uses, but one of the most important is helping businesses find ways to reduce their negative effects on the environment. By maximizing material utilization and decreasing waste generation, manufacturers can make their manufacturing process more environmentally friendly and lessen their impact on the environment. Businesses may find this useful in their pursuit of sustainability goals and in attracting eco-conscious consumers.

Product quality, cost, and a company’s ability to compete in the market can all be improved through the use of overmolding. The process of overmolding is one that is ever-evolving and getting better. Consequently, a plethora of innovative and interesting products that take advantage of its benefits are expected to proliferate.


Industries and Products Utilizing Over-Molding

“Over-molding” is a way to make things by shaping one piece of material over another to build something. A lot of different fields use this method to make things last longer, look better, and be more useful. Below will talk about a number of different fields and products that use over-molding.

Over-molding is used in many fields, but one of the most common is the auto world. More than one mold is used to make parts for cars, like door handles, gear shift knobs, and steering wheels. For better grip, comfort, and looks, manufacturers can mold rubber or plastic over metal parts. More molding not only lowers noise and vibration, but it also makes driving more pleasant and calm.

In the electronics business, over-molding is also helpful. Over-molding is a technique that is often used to make electronics like smartphones, tablets, and remote controls. Making electronic parts can protect their goods from dust, water, and shock by molding a layer of soft rubber or silicone over the parts. This makes electronics last longer and better handle the normal wear and tear of daily life.

Over-molding is also used in the medical field to make a variety of tools and devices that are used in healthcare. With the over-molding method, you can make handles for surgical instruments that are comfortable and fit well. The tool’s surface is also clean and germ-free after this method. Over-molding is also useful because it lets you make orthopedic devices and prosthetics that are just right for each patient. They can move around and be more comfortable this way.

In the consumer goods business, over-molding is often used to make items that are both useful and nice to look at. Overmolded handles are a good choice for kitchen tools and utensils because they give you more control and a better grip. A must-have for electronics is an over-molded case that looks good and works well. A lot of sports gear, like bike grips and golf club handles, can make you feel better and perform better at the same time.

Over-molding is a very adaptable way to make things that can be used in many fields and for many types of goods. Different materials and molding methods are put together to make things that last a long time, work well, look good, and are good for your body. Because technology changes so quickly, over-molding will probably be used in even more areas.

Design Considerations for Over-Molding


Over-molding have many advantages to make plastic injection molded products, but there are some key points you need to think about during overmolding part design,

One of the most important things a designer must think about when designing for over-molding is the choice of materials. It is important that the materials used for the base part and the over-mold work well with each other so that the two layers stick together well. To make sure the final product meets the needs, it is important to think about the materials’ properties, such as how hard they are, how flexible they are, and how well they resist chemical reactions.

Another important thing to think about is how the part’s geometry was designed. To make sure that everything is covered and sticks well, the base part should be designed so that the over-mold material can flow in the right way. It is important to stay away from sharp corners and edges because they can create stress points that can cause the material to separate or crack. Stay away from these stress points. It is also recommended that the design include features like ribs, bosses, and undercuts to make the over-molded part stronger and more stable.

How the mold is made is also very important for how well it works for over-molding. The mold needs to be made so that it can fit both the base part and the material that will be used for the over-molding. If it can’t, flaws like holes, sink marks, and warping will happen. In addition, it needs to have enough air flow and cooling. There are many things that need to be thought about to make sure that the over-mold material flows smoothly and fills the space. These include draft angles, wall thickness, and gate locations.

Along with choosing the material, the shape of the part, and the design of the mold, it is important to think about the process parameters for over-molding. Injection pressure, temperature, and cycle time are some of the things that fall into this category. It’s possible that these things will change the quality and consistency of the over-molded part. When trying to get the results you want, it is important to test and experiment with these parameters to find the best ones.

That being said, over-molding is a useful and flexible method that can be used to make plastic product parts look better and work better. There are many things that you need to think about when making over-molded parts that work well for your application. These include the design of the part, the choice of materials, the design of the mold, and the process parameters. Over-molding can help you make products that are both new and durable if you plan them carefully and pay attention to the details. This will help you stand out in the market.


Many thanks to Sincere Tech, a leading Chinese mold manufacturer that specializes in overmolding solutions and plastic injection molds. We provide high-quality injection molding products and services tailored to each customer’s needs.

Sincere Tech delivers high-quality overmolding solutions in accordance with the strictest industry standards. Skilled professionals support the mission. Our user-friendly interface makes finding the right overmolding solutions for your project easy.

Plastic mold manufacturing, custom plastic injection molding, rapid prototyping, mold design, post-manufacturing processes, assembly, and efficient delivery are our services. We offer rapid prototyping in addition to our many services. Whether you need a prototype or a large-scale manufacturing project, we can meet your overmolding needs. We have the skills and resources to meet your needs.

For excellent overmolding solutions, contact Sincere Tech. Our team is available to answer questions and offer advice throughout the process. Do not look further for reliable overmolding suppliers; contact us today. We believe our solutions will help your company achieve unprecedented success.

We appreciate your consideration of Sincere Tech as a reliable overmolding partner. We look forward to working with you on your plastic injection molding projects.


ST Plastics has the capability of molding all different rubber types, including difficult to process rubbers like carboxylated nitrile. Colson Plastics has been inserted and overmolding rubber for over fifteen years. 

An advantage ST has over other rubber injection molders is the product size they are capable of producing. Products can be molded of rubber that weighs up to 25 pounds.

ST has considerable experience processing nitrile, neoprene, SBR, EPDM, and carboxylated nitrile rubbers.

ST Plastics’ facility has its own individual molding competencies involving insert molding, overmolding, molding high-temperature materials, molding thick wall products, and molding difficult, complex shapes.

Materials processed at Colson facilities include, but are not limited to, Acetal, Nylon 6, Nylon 6,6, Polyurethanes, Thermoplastic Elastomers (TPE), Polyethylene, Polypropylene, ABS, Polyesters, Polyvinyl Chloride (PVC), Polycarbonate, and glass-filled materials. With over 30 million pounds of engineering resin and over 10 million pounds of commodity resins purchased each year, Colson uses its material supplier partnerships to provide technical support for developing material solutions.

ST facilities utilize automation and the latest technology to manufacture products. All Colson facilities are manned by committed, dedicated associates in a non-union environment.

Plastic Injection Mold Manufacturer China

Mold manufacturer China service will be of the best way for the overseas customers who need custom plastic injection molds.

With rising demand for the production of plastic parts across the globe, injection molding has become one of the most popular manufacturing processes. In China, injection molding is a booming industry and widely used to produce plastic parts of numerous varieties. If you’re looking for a reliable plastic injection mold manufacturer that can provide a wide range of plastic parts for your business, then China is certainly worth considering.

Why Choose a Mold Manufacturer China?

There are a few key benefits of working with a Chinese mold manufacturer, including:

  1. Cost-Effective Production: Compared to many other regions globally, China has lower manufacturing costs, which means you can often save money on the production of your plastic parts by working with a Chinese mold manufacturer.
  2. High-Quality Production Standard: Many Chinese mold manufacturers have advanced technology and equipment, ensuring high precision and consistency in the manufacturing process. Moreover, many manufacturers adhere to strict international quality standards, which helps to ensure high-quality production outcomes.
  3. Wide Range of Plastic Injection Molding Capabilities: Chinese mold manufacturers generally have extensive experience and can offer a wide range of plastic injection molding capabilities, including injection molding, overmolding, insert molding, and much more.

Finding the Right Mold Manufacturer in China

If you’re looking for a reliable mold manufacturer China partner, here are a few tips to help you find the right manufacturing partner:

  1. Conduct Thorough Research: Do your research to identify and analyze potential mold manufacturers in China. Check out their website, read reviews, and try to identify the right partner that matches your needs.
  2. Assess Manufacturing Capabilities: Understand the specific plastic injection molding capabilities of different mold manufacturers to find the right partner that can meet your needs.
  3. Check Quality Credentials: Ensure that the selected mold manufacturer has the relevant quality certifications and manufacturing credential to guarantee quality output and compliance to international standards.

Injection molded plastics are cost effective in the long run as they offer benefits of flexible designing and low cost of mass production. The recent stats have reversed that plastic production equipment industry has thrived with the market growth greater than ever as these molded plastics have certainly replaced metals in a number of industrial applications.

On industrial scale, molded plastics are produced by compressing liquid plastic in a molded form with Plastic injection mold as these machines release the molded products as they gains their solidified form. After years of industrial practice, manufacturers have listed down some major raw materials that are now commonly and commercially utilized in molding industrial plastics. Some of the most ideal foil plastics include PP, ABS, HDPE, and PS that are carried under manufacturing prescribed standards for manufacturing plastic for industrial and commercial applications.

In the automotive industry, molded plastics are utilized for molding ancillaries, dashboards and door handles for automotive vehicles.  Similarly, molded plastics are taken under employment for packaging household consumer based products as the offer safety and durability due to their light weight and unbreakable structure. Injection molded plastics are also increasingly popular among house ware and personal care sectors as their increasing application is the reason behind their augmented demand in the market.

The global research on Injection Molded Plastics 2014-2018, further predicts the instability of raw material, as their demand is direct affecting the supply growth in the market. The cost of Plastic injection mold makers is though high in demand, however the fluctuation and instability in price of crude oil is making it difficult for manufacturers to uphold the margin of profitability in the long run

We offer:
Services for custom injection molding and custom Injection Mold Design and mold ManufacturingMold Manufacturer China
Custom Plastic Vacuum Thermoforming Service
providing precision quality, dedication, teamwork, and total customer satisfaction.

Custom injection molding services
Custom plastic parts & Tooling
Plastic injection molding company based in China serves worldwide.
Elastomers molding – Rubber & Silicone

We are a China based reliable, innovative supplier in the plastics injection molding services business. We dedicate to the principle of “quality is second to none” and always can tailor a solution for each of our customers with the possible low costs on tooling and as well as on production process. By taking the advantage of relatively low labor cost, our specialty is mass production of small or medium sizes molded plastic parts, like packaging plastic bottle closures (cap), electronic components, EIFS washers, wall anchors or plugs and other customized industrial, packaging and household plastics partsˇ­

The molding company capacity for molds clamping force starts from 85 to 1650 tons, so no matter a tiny plastic screw or a big interior bucket of a washing machine, we can always get the jobs done easily and precisely with our latest sophisticated automatic molding machines. We also have our onsite plastic injection molding engineers to help you in the prototype design, tooling, and trouble shooting processes.

By keeping the pace of the world most advanced plastic processing technology, customer-centered services and cost effectiveness, we grows up and became strong. We seek to preserve our long-term relationships with existing customers and attract new customers through the establishment of value added relationships well beyond plastic parts requirements. These were the principles upon which we were founded in 2005 and remain the main operating philosophy of the company today.

As the increasing demands of our customers, we expanded our business to die casting parts and plastic profile extrusion in the year 2006 and achieved a great success. Now, we are making varies kinds of plastic packaging products like: folding blister, clamshells, clear folding cases by PVC, PS, PETG and other materialsˇ­

Final Thoughts

If you need a reliable mold manufacturer China, it’s crucial to have a good understanding of their manufacturing capabilities, quality standards, cost, and other parameters. This article aims to give you an insight into the key considerations you should bear in mind while working with the Chinese mold manufacturer to get the best results.

We create advantages; We enhance your competitiveness. if you are looking for mould suppliers in china to support you, Contact us today!