Silicone is a rubber-like elastomer with low surface energy, which can make it difficult to bond to substrates.
Two recommended adhesives are those with a silicone base or using cyanoacrylate adhesives after applying the correct surface treatment.
What is Silicone
Silicone is a material that remains elastic at low temperatures, -100°F (-73°C), and has a good temperature stability; up to 390°F (199°C) continuous exposure and up to 575°F (302°C) for short periods.
Silicone is extremely flexible and can be easily compressed between two surfaces making it ideal for seals and joints. Silicone is widely used in the health industry from making flexible medical devices, tubes, prosthesis and surgical implants.
Its high temperature resistance and non-stick properties have made it popular in the baking industry for creating silicone moulds.
How to bond silicone
Degrease the surface with isopropanol to remove any traces of oil, dust and grease residue. We recommend using Permabond Cleaner A or an impregnated wipe like Wipemaster Wipe 9 IPA Wet Wipes.
Acetone and other cleaning products can be aggressive and may leave residue on the surface.
Always make sure the solvent has evaporated and the surface is clean and dry before bonding.
If you are using cyanoacrylate adhesives to bond silicone, it is advisable to use a primer such as Permabond POP. Permabond Pop can be applied after the surface has been cleaned.
Permabond POP enhances the adhesion to silicone and can be used as an alternative to pre-treatments such as flame or plasma treatment.
These adhesives are capable of bonding silicone, however, if you need a quick cure, they may not be the best solution.
These adhesives cure within seconds at room temperature and are available in a range of viscosities and capabilities.
We recommend Permabond 2050 since it is flexible, easy to apply and does not affect or modify the feel of the silicone. When Permabond 2050 adhesive has been used in applications, it has been difficult to detect the bond, as it remains soft like the base material. This makes it great for seals and O-rings.
Permabond 105 is ideal for bonding tight-fitting parts and hard to bond plastics and rubbers.
Apply Cyanoacrylate Adhesive
Once you have selected your product, apply the adhesive sparingly to one surface and bring the components together quickly and correctly aligned. Apply some pressure to ensure the adhesive spreads into a thin film.
Always refer to the product Technical Data Sheet for full instructions.
Antala has a wide range of adhesive for bonding silicone, contact us to find out more.