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54 SMT Magazine • July 2014 TIN WHISKER RISK MANAGEMENT By CoNFoRMAl CoATING continues fEATURE Inspection Results for Bent Coupons with Conformal Coating There was observable tenting but no tin whisker protrusion of the 1.0 mil and 2.0 mil thick acrylic conformal coating on the regions in compression for the Copper C110 base metal samples during the sampling in the fourth quar- ter of 2013. There was no indication of tenting or tin whisker protrusion for the 3.0 mil acrylic conformal coating or any of the thicknesses of Table 4: Tin whisker observations at end of experiment.