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42 SMT Magazine • June 2014 retaining 250% elongation is still highly elasto- meric and this property is likely still more than adequate for a great number of applications. Another line of reasoning would say that an end-of-life set point should be determined as when a material reaches some certain minimum value for a given important property. In the ma- terial example, the criteria might be retention of an absolute value of 50–100% elongation. Of course, these criteria would be very application specific and would require a great deal of testing for any given application, considering operat- ing conditions and geometric dimensions of the sealed part. feaTure eXPLORIng HIgH-TeMPeRATuRe ReLIABILITy LIMITS FOR SILICOn ADHeSIveS continues Table 4: Thermal aging for adhesive 1 @ 300°C. figure 4: elastic modulus during thermal aging.