HIGH TEMPERATURE RELIABILITY LIMITS OF SILICONESAuthor: Kent Larson
Company: Dow Corning Corporation
Date Published: 10/11/2007 Conference: SMTA International
Silicones are a common protective material used in high temperature applications. Very high temperature stability is often claimed, but usually without substantiation or details. A study was undertaken to evaluate the high temperature performance and reliability of a variety of silicone adhesives, encapsulants and coatings. Short, mid and long term duration stabilities were determined according to procedures outlined in UL Standard 746B used to generate 10 year Relative Temperature Index (RTI) type of values. The silicone adhesives and encapsulants obtained 10 year stability temperatures of 130-200C, while coatings achieved values of 200C. Short term exposures of up to 325C were evaluated. Arrhenius plots were prepared of property loss vs exposure temperature and duration to provide predictive models of thermal stability over very broad ranges of time and temperature.
Key words: silicone, thermal stability, high temperature, Arrhenius plot
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