Types Of Materials
Silicone's core properties of low conductivity and chemical reactivity, thermal stability, and ability to repel water and form watertight seals make it a common solution for optical bonding.
Epoxy makes a much more rigid bond than silicone, but does not have tendency to form particulate debris. It is not reworkable in the event any problems arise during production or use.
Polyurethane adhesives possess good environmental integrity for use in a high altitudes and may be superior at low temperatures. It does exhibit a yellowing over time when exposed to high solar lighting.