Regardless of which method is used, primer, self-bonding LSR or standard LSR used with bonding additives, understanding the capabilities of each method can help design manufacturability, material selection, and cost savings.
Primers have long been used to bind LSR to the substrate. If a primer is used, the plastic parts to be bonded must first be injected. After forming, the part is ejected and cleaned to ensure that the surface is free of organic and inorganic materials (i.e. grease, dirt, rust, oil, and oxide layers), then a primer is applied. Surface treatment is one of the most important factors affecting adhesion in the bonding process.