Used to modify a surface by adding a layer that can be bonded to – also known as chemical bridging – primers promote adhesion. They are typically used to promote bonding with low-surface-energy plastics or difficult-to-bond metals. While primers can promote adhesion and create a stronger, longer-lasting bond, they are an additional process step and carry H&S considerations.
In many cases, the use of a primer can be designed out, or substituted for a surface treatment process. Here, Kevin Brownsill, Head of Technical: Learning and Development at Intertronics, discusses.
Read the full article in DPA's April 2025 issue