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How do Silica Gel and Metal Stick? The Complete Scheme of Silicone Glue Bonding

Silicone glue has the properties of softness, flexibility, and high temperature resistance. Therefore, it is often necessary to coat a layer of silica gel on the metal to change the properties of the metal surface and ensure the overall strength of the product. The two materials of metal and silicone are not inherently viscous, so a layer of silicone glue must be applied to the two materials to bond them together and not fall off under force.


Commonly-used metals are iron or stainless steel, as well as aluminum. The above three materials can often use general-purpose silicone glue, and for copper and surface electroplating metals that are not commonly used, special solutions must be made, that is, separate formulations. For silica gel, it is divided into cold bonding process and hot bonding process. Cold bonding means that the silicone has been cured, and the cured silicone is bonded to the metal. The hot bonding process refers to contact with the metal coated with glue before the silicone glue is cured, and it is cured under certain conditions. After curing, the silicone and the metal are bonded under the action of the silicone glue.


For cold bonding processes, generally one-component condensed silicone glue is used to bond metal and silicone. After cleaning the metal surface with a solvent, directly apply silicone glue on the metal or silicone surface, press the two materials together, and wait for the silicone glue to solidify to complete the bonding. This kind of silicone glue usually cures to a certain strength within a few hours, and it cures completely in 72 hours.


For hot bonding processes, silicone glue is often called a primer, which is actually a viscous liquid silicone or silicone resin diluted with a solvent. Before applying the silica gel primer on the metal surface, be sure to clean the metal surface with a solvent such as xylene to clean the metal surface, otherwise the metal cannot be bonded with other materials.

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