4 Differences Between Overmolding and 2k Molding

4 Differences Between Overmolding and 2k Molding

By Blog-manager

What are the differences between overmolding and 2k molding?

  1. Number of materials used
  2. Process sequence
  3. Purposes
  4. Machinery or equipment


  • This article highlights how overmolding and 2k molding vary in the quantity of the materials they use to make one product.
  • The process of overmolding usually requires a substrate material, unlike 2k molding.
  • 2k molding is ideal to enhance appearance while overmolding is for functionality designs.
  • Different machines are used for these two methods to ensure the right procedures.

The plastic injection industry is the medium used to produce innovative products. Understanding their techniques is pivotal, as it allows companies relying on them to stay competitive in the market.

One of the details they need to learn is the differences between overmolding and 2k molding. From procedures and purposes to materials and machines, read on to learn which method is ideal for your designs.

Number of Materials Used

These two types of molding procedures differ in the number of materials used. 2K molding generally only uses exactly two materials for one part. On the other hand, one of the benefits of overmolding is it can mold two or more materials for a single part.

Though the quantity of the materials may differ, they use roughly the same materials. Materials like ABS and Polypropylene are compatible with both processes. Despite this, choosing the right materials for your product is important to understand. This is because materials should be complementary to each other to ensure quality.

It is best to consult with experts in the industry to ensure the proper bonding and shrinkage rates of the materials. This makes certain that the product you designed will meet the highest standards of quality.

Process Sequence

Process sequence

The process sequence of overmolding and 2k molding differs due to the number of materials they use. The method of overmolding involves a first layer with a substrate material, supporting the primary layer. The most common materials for this initial layer are PC/ABS, Nylon, and PBT. They are more rigid or have a higher melting point so that they can easily accept the other materials.

2k molding, however, does not need a substrate material. It is also the ideal method to combine hard and soft plastics. This technique is programmed to perform two injections in one cycle. The first injection of material is made into the mold and then it is rotated for the second injection.

Because of their difference in process as well as quantity of materials, overmolding usually takes longer to produce. This detail is important to note when considering the timeline and production size.


One of the key differences between overmolding and 2k molding is their purposes. 2k molding products are usually chosen for their aesthetic or appearance purposes. It can combine two colors in one product in the production process.

Opting for overmolding means that you want more functionality in your products. This is because they are the best option for products with handles. They are the ideal methods of designing products with grip and texture.

Common applications of overmolding are found in construction, beauty, medical industries, and more. Products like toothbrushes, syringes, wrenches, and makeup brushes are made with this technique. Conversely, 2k molding products are bicycle handle grips, dual-colored phone cases, remote control buttons, gaming controllers, etc.

Machinery or Equipment

Machinery or equipment

Both methods essentially use plastic injection machines, but they consequently use two different types. Overmolding machines can come in four types. They are vertical, horizontal, rotary table, and multi-station rotary overmolding machines. They have different purposes that allow manufacturers to create vertical, horizontal, multi-component, and complex products for you.

2k molding machines are designed to efficiently produce two-material products. They can also come in rotary platen, index platen, horizontal and vertical injection, and more.

When considering partnering with reliable plastic injection producers, it is pivotal to know the equipment they use. This will ensure they have the right resources to effectively produce your design. It also shows their commitment to quality when they invest in the right and advanced technology in their production.

Key Takeaway

Choosing between overmolding and 2K molding is important to ensure the quality of your product. This is because they create entirely different items with different purposes. Learning their differences is key to creating unique products that can improve the lives of your target market.

Do you have a product in mind? Choose Richfields Corporation to make your idea a reality. We offer various plastic injection services like precision injection molding and mold making. With over two decades of experience and insight, we can help guide you to create high-performing products. Make your design with experts in the industry who understand quality products and services. Contact us and inquire about the quota today!