Insert Molding China – Understanding The Basics

Insert molding is a special type of injection molding. It involves using a previously-manufactured part and encasing it in molten plastic resin.

It can be used for a variety of different purposes. For example, a knife handle can have a resin injected into it to complete the product, or an electronic component can be covered with plastic resin to waterproof it and shield it from the elements.
By using plastic insert injection molding, you can improve the overall strength and reliability of your components, save on production times and costs, and eliminate the use of adhesives, connectors and soldering to attach components.

Injection Molding Threads For Screw Thread Applications

While this process does not technically count as a type of insert injection molding, Qmolding does also specialize in molding threads into plastic parts to provide attachment points for product assembly.
Using our advanced manufacturing capabilities, we can mold either external threads or internal threads into the part profile. We can handle screw threads of all types and sizes, including buttress threads, tapered pipe threads, ISO 80369 medical Luer fittings and more.

We can easily customize all aspects of screw threads including:

Profile width
Cross section

To learn more about our injection molding capabilities for screw thread applications, just contact Qmolding now. We can help you with the entire end-to-end design, engineering and manufacturing process for screw thread applications.

Insert Molding Advantages

So, why should you use insert injection molding in your products? There are a few different reasons.

Consolidation of parts

Fewer total parts are built for each component, reducing complexity and cost.

Reduction of part-to-part dimensional variability

Eliminating soldering, adhesives and other methods of attaching plastics helps reduce variability and enhances quality control.

Overall reduction of part size/weight

Because no additional attachment compounds are required, your parts can be smaller in size and weigh less, compared to parts that are not insert molded.

Reduction in “touch labor”

There are fewer touch points for each manufactured part, and fewer people involved in the overall production. This helps increase overall quality of your manufactured parts.

Overall cost reduction

The materials and labor costs are lower than using adhesives or other attachment methods to attach plastic components to other parts.
insert molding vs overmolding
For these reasons and quite a few more, Qmolding is a great way to save time and money, eliminate supply chain complexity, and much more.

Does Insert Molding Come With Any Special Considerations?

Because your parts must be directly injection molded, there are a few considerations you should keep in mind when choosing a base component material.
insert molding china


The material must be strong and thick enough to support itself during the injection molding process, and be able to support the weight of the insert molded part without breakage or excessive material stress.


Injection molding takes place in a high-pressure environment, so the base component must be robust enough to withstand this pressure without collapsing.

Temperature resistance

The inserts must be able to withstand the high temperatures required for plastic injection molding without melting, warping or otherwise failing.
When choosing materials for your base components, these factors should all be kept in mind so that you do not have quality issues.

Insert Molding vs. Injection Molding vs. Overmolding

Injection molding refers to the overall process of molding an object by injecting melted plastic into a high-temperature, high-pressure environment. Both insert molding and overmolding are a type of injection molding.

they may seem similar, but they are quite different. Insert molding is used to embed a small component into another material – such as placing a threaded plastic insert into another plastic component.

Overmolding, on the other hand, involves injecting a layer of material over another layer of material. A hammer, for example, may have a metal tube handle that is overmolded with a layer of soft-touch plastic to create a grip.

two shot injection molding

Why Choose Qmolding For Your insert molding Services?

Wondering why you should choose Qmolding for your parts needs? Here are a few of the reasons we’re the best choice.

Guaranteed quality

We always stand by our work. Your comments will meet all of your tolerance requirements, and pass our in-depth quality control tests.

molding expertise

We have been working in the injection molding industry for years, and have a team of highly-experienced engineers and operators.

Timely delivery

We guarantee that your projects will be done by your required deadline, and that your components will be delivered to you by the agreed-upon date.

Integrated design

We can assist you in the development of your insert molded component, thanks to our in-house design and engineering services.
For all of these reasons, Qmolding is the best choice for insert molding.
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Get A Quote From Qmolding Now

Ready to get started with Qmolding now? Contact us now to give us some more details about your project.

We’d be happy to provide you with a quote for your project, and answer any other questions you may have about using our insert molding china services. No job is too big – or too small – so get in touch right away.

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