Selecting Materials for your
Multishot Component

Material selection is critical to successful bonding with Multishot Injection Molding.  Because chemical bonding occurs only with compatible materials and because the choice of material is crucial to the performance of the part, many factors must be considered to ensure that the two resin choices will both bond and perform with suitable results. Here are some general material selection guidelines:

1. Determine the performance requirements for the substrate (1st shot).
2. Determine the performance requirements for the overmold (2nd shot).
3. Examine how the component will interact with the completed assembly.
4. Determine the physical properties needed to achieve the desired performance requirements.
5. Examine the environment in which the component and product will be used.
6. Determine if the material choices need to meet external regulatory requirements.
7. Determine if there are additional performance characteristics that could be supplied by the materials.
8. Select choices for the substrate (1st shot) then select choices for the overmold (2nd shot) based on compatibility with the substrate.
9. Test the two materials for suitability if their compatibility is unknown.
10. Revise the geometry of the design as needed based on characteristics of the material selections.

Download Guidelines: Material Selection for Multishot Injection Molding pdf

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