How silicone adhesives work
|When a silicone adhesive cures, it becomes mechanically and
chemically locked in place, like a puzzle piece.
Mechanical and chemical adhesion
The first requirement of good adhesion is good spreading and wetting. With
its low surface tension and slightly higher critical surface tension of
wetting, polydimethylsiloxane is a master at spreading, wetting, and leveling.
It quickly and completely penetrates into small voids in the surface of the
By adding reactive adhesion promoters (silanes) to the
adhesive, it can be designed to chemically bond with anything from metal and
glass to paper, fabric, plastics, and even human skin. This chemical bond
further strengthens the mechanical bond.
In pressure sensitive adhesives, tack and cohesive strength are achieved by
formulating reactive silicone fluid-resin mixtures. These mixtures contain
groups that will react by silanol condensation to form a strong, flexible
Silicone adhesive benefits
Chemically and thermally stable
Resistant to moisture and weathering
Suitable tack for quick bonding
Ability to conform to skin; acceptable adhesion to skin for extended
periods of time; easily removed from skin; able to deliver active ingredients
to the skin
Easily customized and co-formulated
Can be formulated to adhere well to a wide range of surfaces
Can be designed to withstand highly acidic or basic chemicals, and organic
Typical silicone adhesive applications
sealants and adhesives
Adhesives and sealants for manufacturing
durable goods, such as automobiles,
windows, appliances, and electronic
Medical adhesives for attaching transdermal drug delivery patches and
other types of silicones work.