2-Shot Injection Molding

Double Shot Injection Molding Process and Capabilities for 3D MIDs

Double Shot Injection Molding3D-MIDs can be constructed with the electronic circuit via 2 shot injection molding. Two shot molded components can have an advantage over Laser Direct Structuring components for higher volume production and when the lines and spaces are greater than .015”.

At SelectConnect Technologies we can help with prototyping and ramping up your 2-shot program to production. While we do not mold the parts, we have preferred suppliers who are exceptionally skilled at developing a 2-shot molded component with the proper materials of construction.

Materials

The double shot injection molding process uses two different resins where only one of the two resins is platable.

The platable substrate is commonly ABS (acrylonitrile, butadiene, styrene) and the non-platable substrate is PC (polycarbonate).

2 shot injection molding can also use alternate materials, such as:

  • Nylon
  • PBT
  • PPS
  • LCP

It’s important to have a catalytic difference between the two plastics for a successful 2-shot injection molding application.

Process

The activation step is critical to successful plating of the 2-shot molded component.

Chromic acid, sodium hydroxide, sulfuric acid, and potassium permanganate have all been used to etch the second shot and provide activation sites for electroless deposition without attacking the first shot.

After a chemical neutralization, the 2-shot product needs to be activated and then plated with electroless copper, electroless nickel, and immersion gold (if required).

Successful 2-shot injection molded 3D MIDs rely on precise molding and consistent electroless plating.

Wherever the second shot material flows – the plating will follow.

It is not uncommon for the second shot material to be doped with a small amount of palladium to improve the electroless copper deposition reaction that forms the circuit.

Request more information on 2-shot injection molding now or quickly contact us online and we’ll respond shortly.