The optics industry widely uses silicones for various fiber-optic, cable potting applications and light-emitting diode protection. Optics manufacturers know traditional silicone elastomers, gels, thixotropic gels and fluids not only perform extremely well in high-temperature applications but offer refractive index matching so that silicones can transmit light with admirable efficiency. However, because environmental conditions may affect a material’s performance over time, one must also consider the conditions in which the device operates to ensure long-term reliability. External environments may include exposure to a combination of UV light and temperature, while other environments may expose devices to hydrocarbon-based fuels. This article delves into the chemistry of silicones and functional groups that lend themselves to properties such as temperature, fuel and radiation resistance to demonstrate why silicone is the material of choice for optic applications under normally harmful forms of exposure. Data will be presented to examine silicone’s performance in these environments.

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This article appeared in Global SMT & Packaging 7.8, August 2007.

Keywords : Optical Silicones, Polysiloxanes, Harsh Operating Environments, Extreme Temperatures, Radiation, Fuel Resistance

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