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Insert moulding is a process that can be done either at the time of the moulding process, or inserted after the part as been made as a post moulding operation.
Considerations need to be taken as to which way is more suitable for the product as it can mean a varied cycle time when loading inserts by hand. To get the best quality mouldings, it is not advised to allow the cycle time to vary from shot to shot as this allows the material to degrade in the barrel.
Typical products that are insert moulded are threaded brass inserts or metal screws.
If you are needing parts with differing properties then this could be an option for you.