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A two-shot injection moulded part made from PC/ABS and TPE.


Whether you're looking for rubberised grips or in-moulded light guides;

two-shot injection moulding is the most sophisticated way to combine two different polymers in a single component. 

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It's a process with many different names around the globe, but should not be mistaken for lesser techniques.

The key advantage of two-shot, is the cohesive bond between polymers (or elastomers), which provides a level of strength between substrate and second-shot that is not possible with lesser techniques.

A vast range of polymers and elastomers can be chosen from to create a wide array of end-results. Soft touch surfaces, contrasting colours, clear windows, LED light guides, IP seals and flexible buttons are all great examples of the endless possibilities!

A series of two-shot injection moulded parts.
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A man wearing a Fluke polo-shirt.


With two-shot there is a better interface between the plastics, because the initial injected substrate is free from surface contaminants within the mould (enhancing adhesion) and also retains a high level of thermal energy (heat), improving the melt flow of the second shot.


Another advantage of the two-shot process over that of over-moulding relates to a reduction in post-mould-shrinkage of the substrate, as it is retained on the core-side of the mould until the cycle is completed with ejection.

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With two-shot moulding, the substrate commonly remains on the core side of the tool in a fixed and well-indexed location. When the second shot cavity closes against the substrate a highly accurate shut-out is achieved, which is not so feasible within the over-moulding process.

Once the process has been established, the two-shot process also lends itself well to an automated cycle, as no operator involvement is necessary.

A Fluke thermal imaging camera.
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Discernible BENEFITS

This makes two-shot the perfect choice for complex, multi-material, and multi-coloured components or products where the cosmetic finish needs to be seamless and free from visual defects.

With two-shot you can achieve:

  • reduced unit cost

  • faster cycle time

  • reduced waste and risk of damage

  • single process with no manual intervention

  • fewer assembly defects

  • enhanced product quality

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