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One of the most critical polymeric properties required to predict the absolute stress state of a semiconductor package is chemical shrinkage developed during the polymerization process. The issue of chemical shrinkage is not new. Numerous testing methods have been developed for many decades and some of them are practiced routinely to measure the intrinsic (or total) chemical shrinkage of polymers. It is important to note, however, that not all of the intrinsic chemical shrinkage contributes to the residual stresses simply because some of chemical shrinkage occurs before the gelation point where polymers start to build mechanical strength. The shrinkage that contributes to the residual stresses is called effective chemical shrinkage. This webinar will provide a review of CALCE EPSC research on this topic of chemical shrinkage. About the Presenter: Prof. Bongtae Han a Professor of the Mechanical Engineering Department of the University of Maryland at College Park and one of Research Directors at the Center for Advanced Life Cycle Engineering (CALCE), directing Laboratory for Opto-Mechanics and Multi-layer Systems. His research interest is centered on design/process optimization of microelectronics devices for optimum mechanical reliability. His previous professional career includes Advisory Engineer at IBM Microelectronics.