Sandblasting the insert

Sandblasting is a surface-cleaning process that uses high-pressure abrasive media (sometimes combined with water to reduce dust). It removes problematic surface layers—old coatings, oils/grease, buildup, and rust—leaving a clean surface.
This creates a base that supports strong adhesion for subsequent anti-corrosion or protective treatments.
   

Priming and applying a bonding agent

Primer strengthens the substrate and helps prevent damage. It also improves adhesion between the next layer (bonding agent/adhesive) and the base material. The result is a stable surface with reduced and uniform absorption and stronger bonding between interfaces.

Bonding rubber to the metal insert

After sandblasting and priming, a bonding agent is applied—by spraying, brushing/painting, or dipping. Inserts are dried and pre-heated according to the bonding agent’s technical data sheet (TDS), then introduced into the molding process.
We can bond rubber to inserts using compression molding, transfer molding, or injection molding. During molding, the bonding agent activates and forms a chemical bond between the rubber and metal. Molded parts then proceed to finishing operations.