The transmittance properties of optical adhesives in humid environmental aging

In this paper optical properties of optical adhesives exposed to high humidity aging are investigated. The properties were studied using transmittance measurements. Both silicone-based and epoxy-based adhesives were studied. The transmittance properties of the silicone-based adhesives did not impair even after 1,200h of high humidity aging at 85°C and 85% relative humidity. Epoxy-based adhesives were seen to impair due to high humidity aging, but there were differences between the adhesives. Additionally, the curing temperature was found to play a role in the performance of the epoxy-based optical adhesives.