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What glue is generally used to bond silicone to silicone?
11 Nov 2026
Bonding silicone to silicone is a common requirement in silicone rubber product processing, but because silicone itself is chemically inert and has low surface energy, ordinary glues struggle to form effective adhesion on its surface. Bonding silicone to silicone requires special adhesives compatible with the silicone system. In the industrial field, mainstream solutions fall into three categories, each with its own application scenarios.
I. Room-Temperature-Curing Silicone Adhesive
Represented by one-component room-temperature-vulcanizing (RTV) silicone adhesives, this is the preferred solution for bonding already-formed silicone parts to each other, requiring no special equipment and offering convenient application.
• Curing principle: Crosslinking reaction with moisture in the air, curing gradually from the surface inward, belonging to a deacidification-type or dealcoholization-type moisture-curing system.
• Performance characteristics: After curing, the adhesive layer has properties similar to the silicone substrate itself—both are silicone rubber materials—providing excellent compatibility. The bonded interface is flexible and elastic, resistant to bending and high/low temperatures, and offers excellent weather resistance, aging resistance, electrical insulation, and waterproof sealing performance, achieving a "silicone-to-silicone" homogeneous integrated bond.
• Application scenarios: Butt-joining silicone tubes, splicing silicone sealing rings, repairing silicone products, assembling silicone accessories, sealing and waterproof bonding, etc.
• Key points: Curing speed is affected by ambient temperature and humidity; the thicker the adhesive layer, the longer the complete curing time. Before bonding, surfaces must be cleaned of oil stains and mold release agent residue to ensure a clean interface.
II. High temperature Adhesive
For integral molding between unvulcanized mixed silicone rubber, or for secondary vulcanization bonding of silicone to silicone inserts, heat-vulcanizing adhesives are the highest-strength solution.
• Process characteristics: After applying a primer, the adhesive is hot-pressed together with unvulcanized silicone, completing crosslinking and bonding simultaneously during the vulcanization process. Bond strength can reach the tear strength level of the silicone substrate itself.
• Application scenarios: Secondary vulcanization overmolding of silicone products, multi-layer composite molding of silicone, industrial silicone roller coating, and other large-volume molding production scenarios.
III. Surface Treatment + Instant Adhesive
For small-area silicone bonding that requires rapid positioning, a "silicone surface treatment agent + instant adhesive" combination can be used.
• Process characteristics: First activate the silicone surface with a treatment agent, then apply a drop of instant adhesive. Rapid curing and positioning can be achieved in seconds to tens of seconds, offering extremely high efficiency.
• Limitations: The instant adhesive layer tends to be brittle, with weaker bending resistance, temperature resistance, and aging resistance compared to dedicated silicone adhesives. Long-term reliability is limited, making it more suitable for temporary fixation or low-stress small-area bonding.
