Choosing an Adhesive for Your Substrates: Surface WettingFirst, Then Hardness and Thermal Mismatch

Most searches start with “the strongest adhesive for electronics”, yet what answers you first is the surface — a metal housing, a low-surface-energy plastic cover, a board wrapped in solder mask. When a joint lets go cleanly from the surface, the limiting factor is the interface, not the strength of the adhesive.

Conclusion: assess surface wetting first, then hardness and thermal mismatch. A flexible 35–55 Shore A joint absorbs displacement; a rigid >85 Shore D joint stores stress. Most bond failures are not caused by insufficient strength.

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