Skip to content

What You Should Know About Overmolding Circuit Boards?

Most PCBAs come with a strong and protective barrier because they might occasionally be sensitive into environmental conditions. The injection mold procedure is used in this situation.

It is an effective approach to safeguard PCBAs and maintain visual appeal. We will now be able to see overmolding circuit boards clearly.

What Does a PCB Offer?

PCBs are little parts that make it possible for various forms of some modern technology so as to be able to function. In the past, connecting its wires from one onto the next was a laborious process for both production and maintenance. The idea of the printing of circuits on the top of your board resulted from this.

A basic conductive sheet serves as the basis for the entire procedure. With two layers of insulation provides support for conductive pieces.

A basic conductive sheet serves as the basis for the entire procedure. In most instances, a dual insulation layer provides support for a conductive element. Drilling is done on the sheets to make the registration holes required for accurate alignment. To make sure everything works in the right location for the CAD designs, then you can employ in-depth 3D models.

To be able to etch copper, the alkaline solution is employed, which aids in creating the proper tracing outline. It functions because UV lamps place the mask present on its copper layer, a process that may also be done in bulk. Utilize the optical testing device to examine the quality of copper traces for the short circuits as well as other types of damage. The solder mask coating’s distinctive greenish color provides insulation and protection.

Additionally, a silkscreen can print logos, markings, or symbols right onto the PCB.

How Does Overmolding Circuit Boards work?

The word “overmolding” describes a procedure that arranges and shields the component using injection or insert molding.

The first method is to put the PCBA assembly in place and then directly inject the overmold over it. This approach typically entails more alternatives for simplified look creation, color and logo customization, and the overall overmold design.

This second method of overmold injection involves providing a stronger barrier to serve the PCBA. It must be enclosed with a cap known as Lexan encapsulation in order to accomplish this. The design of the cap also enables it to accommodate the PCB as well as guarantee that it features a unique protective shell to protect vulnerable components.

The next stage after creating the cap is overmolding utilizing that very same options available for the process of instantaneous overmolding.

What are the Advantages of Overmolding Circuit Boards?

Nevertheless, while adding an additional degree of security, you must take the cost into account. Therefore, the question is: Is the investment worth it? A PCB component whose firmness is increased through overmolding circuit boards will perform better as well as be more resilient than one whose firmness is not increased.

Strength By having stronger flexural strength, high-traffic areas such as cable exits may take more tear and wear while still performing as intended.


Overmolding provides wall protection for components. You will discover that because of this, extreme environmental factors including high temperatures, abrasions, impacts, water, as well as other types of external forces won’t bring any damage to them.

Maximum Security

Even severe external forces are protected by an additional shielding layer provided by overmolding. It serves as a direct protection component for your PCB.

Perfect Performance

The strain relief and pull strength capabilities of Circuit boards are improved by overmolding.

Enhanced Defense

Overmolding circuit boards aids in protecting components from corrosive substances like oil and saltwater.

Aesthetic appeal

Here, the truth is, aesthetically pleasing products typically sell better. O PCBs with overmolding circuit boards typically have better aesthetics and are simpler to integrate and maintain.

Customizing overmolds

There are various advantages to customizing Circuit boards using an overmold, including:

  • It supports the quality printing of business logos, names, as well as other types of branded messaging
  • Provides diverse angles for the exit point, including a straight angle, which is occasionally required to meet the objectives of a project.
  • It gives various locations that enable the integration of attached components such as a flange.
  • It permits the utilization of various overmolding materials, such as PVCs or thermoplastics.

Looking Closely at the Overmolding Circuit Boards Process


The procedure can be relatively straightforward or quite difficult. The decision about the machine as well as the material is crucial.

What Molding Equipment Should I Use?

The overmolding cable process is propelled by injection molding equipment. They can exert strong or low pressure to move any form of molten objects which has to do with the mold type needed.

The force necessary to suspend the molten resin inside the mold is referred to as tonnage when choosing your molding machine. More is required for larger molds. The method depends on using the right injection molding equipment.

Choosing the Best Materials for Overmolding Circuit Boards

One can employ a virtually infinite variety of materials to get a variety of results. One might result in the ideal rigidity, whilst another might produce more flexibility. However, everything is dependent on the requirements of a specific project.

However, TPU and PVC are two popular overmold materials (thermoplastic polyurethane). The latter is popular primarily due to its cost-effective qualities and is excellent for increasing strength and moisture-proofing.

Final injection molding

Following the selection of the material, the molding machine’s hopper will need to be filled, and its injection screw will then pump the material in the mold. This procedure will heat all materials in the barrel and press them in the tool-made mold. This will keep building pressure until a point whereby solidification is possible.


Having the right education as well as skill set is beneficial when dealing with physically delicate components like overmolding circuit boards. Failing to do this will result in subpar goods or possibly a molding machine malfunction. Contact us for your top PCB services, and a member of our staff with extensive experience will respond.




                Get Fast Quote Now