Ten Tips on Overmolding
Match compatibility of TPE and substrate.
Minimize peeling with sharp transitions in shut-off design.
Avoid trapping air in cavities via appropriate venting.
Balance TPE thickness with Shore A hardness for desired “feel.”
Maintain TPE melt temperature at the level that optimizes adhesion.
Dry moisture-sensitive materials.
Select color-concentrate carriers that are compatible with both the TPE and substrate.
Be aware of liabilities of smooth surface textures.
Keep the TPE flow-length/part- thickness ratio below 150:1.
Design gating with good adhesion in mind.
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