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How Temperature Effects Transmission of Silicone Encapsulants

This paper describes five optically clear materials that were evaluated for changes in optical transmission due to temperature (150°C). Initial testing revealed that 150°C temperature exposure enabled reactions between the silicone being tested and the gasket material used to form the sample preparation. Observation of the cross contamination accelerated by the 150°C temperature exposure and the juxtaposition of dissimilar materials leads us to the following recommendations for working with optically clear silicones at high temperature:

  1. do everything possible to get the heat out
  2. be aware that effect of material incompatibilities will be accelerated at elevated temperatures
  3. use the lowest cure temperatures needed to accomplish the curing of the silicone