Injection molding is used in the manufacturing of various parts. It involves the injection of molten material into a mold to produce the parts. It is mostly used to fabricate plastic parts but not limited to this only. Below are types of moulds:

Thermoplastic Injection

This type of molding is based on thermoplastic polymer. It means the plastic is not permanently solid even after cooling down. It can be liquefied through heating.


This refers to a process where injection mold is used on another substance. A good example is using an injection on metal to increase durability while enhancing the performance of a product. Overmolds are used as a sealant in products created from a few injection molds.

Insert Molding

Insert molding is similar to overmolding. But, it involves the use of more than one mold in a single product. It is a process that adds strength to a product without getting other additional parts. This ensures the weight remains as intended.

Cold Runner Injection

This type of mold injection involves a process where the runners are filled with a sprue and used to inject cold cavity. It reduces wastage by regrinding and recycling, but the cycle time increases. Cold runner injection eases color change and is perfect for different polymers.

Hot Runner Molds

The hot runner molds heat and melt plastic resin before sending it to the mold cavity. They are heated, externally, and internally. The external ones are for less sensitive molds while the internal one is for molds that require flow control.

Blow molding

This is the type of injection molding where raw plastic is shaped using a hollow tube. It helps to develop various plastic parts.


Mold injections help to create different parts, which eventually create whole products. The above types of injection molding are more detailed but can only be carried out by experts in molding.