Silicone is a high-performance elastomer with the ability to withstand extreme temperatures, both high and low. It also naturally repels, which makes it an excellent choice for a water seal or a moisture barrier. However, this also makes silicone tricky to bond to other surfaces.
When bonding dissimilar materials, the surface energy of each is an important consideration. Materials with a high surface energy have a molecular construction that provides a more accepting bond than materials with low surface energy, which resist bonding. Silicone is a low surface energy elastomer.
A silicone adhesive will bond quite well to silicone rubber. However, an acrylic or rubber-based adhesive will not bond securely to the silicone without some help. Help most often comes in the form of a surface treatment of the silicone, such as priming or corona treatment. Both effectively alter the surface energy of the silicone: one chemically, the other with an electrical plasma charge. Both methods of surface treatment are capabilities that Marian can provide.
The ability to bond to a silicone surface is one of many key factors you should examine when considering silicone rubber material for your design. We encourage you to download our Free eBook, Pros and Cons of Designing with Silicone Rubber to learn more about this high performing material.
Material selection can be an overwhelming process. Marian engineers are available to help you weigh out your many options, providing data, material samples, and rapid prototypes. Contact us today!