Start with the exact substrate and soft-material grades. TPE describes a family of thermoplastic elastomers, and TPU is a thermoplastic polyurethane. When a supplier uses the term TPR, ask for the compound identification and processing data. Rubber compounds that require curing need a suitable process and equipment package.
Match the Material Pair
Ask the material supplier for evidence on the intended substrate grade, including its fillers, surface treatment and color package. Review storage, moisture control, contamination and substrate temperature with the chosen process.
Choose the Sequence and Interface
Compare an integrated multi-shot sequence with transfer of a separately made substrate. Select the shot order from part geometry, material conditions, tooling and support during filling. Review where the design needs adhesion, mechanical retention or a combination. Specify the actual surface preparation and texture in the trial plan.
Test Representative Parts
Check the required peel, pull or other interface test, dimensions, hardness and appearance. Include the intended aging, exposure or loading conditions where they affect the application. Use the results to approve the grade combination and process window.
See the integrated and transfer process comparison. For grade selection, consult Avient’s TPE overmolding guide.
