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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