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5) Surface treatment

A key requirement on the substrate is that the surface layer, on which the actually adhesive bonding occurs, must be firmly attached to the substrate.

Imagine, for a moment, two steel substrates with rusty surfaces which have to be bonded. If the surface rust layer is not removed, then the bonding process merely bonds together the rust layers on the two substrates. On being subjected to a s‌tress/l‌oad, the rust and the adhesive can detach from the substrates.

This is one of the reasons why s‌urface treatment of the substrates is an important step in industrial bonding processes.

This section outlines the fundamental principles and describes the most important s‌urface treatment methods for different types of substrates.

In order to select process parameters, it might be necessary in some cases to consult external advisors.