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June 2014 • SMT Magazine 41 For a highly elastomeric material like sili- cone, an interesting point is elongation. Note that the typical elongation of the adhesive 3 (Table 1) is 500%. It is unlikely that for actual applications the adhesive is stressed close to its property capability, stretching the adhesive up to 500% its original size. Using the UL RTI type of test criteria where the end-of-life set point of any property is the loss of half of its original value, one would conclude that when the elongation of this material had dropped to 250% it is degraded to an end-of-life set point. However, a material eXPLORIng HIgH-TeMPeRATuRe ReLIABILITy LIMITS FOR SILICOn ADHeSIveS continues feaTure figure 2: Change in tensile strength during thermal aging. figure 3: Change in durometer during thermal aging.