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18 The PCB Magazine • June 2015 Figure 7: Distribution overview plot of all IST coupons based on cycles to failure. The data was right censored at 1000 cycles. Figure 8: comparison of IST cycles to failure of the PTH with (red) and without (black) stress reducing additives. A HIGH-RELIABILITY, STRESS-FREE COPPER DEPOSIT FOR FPC, POLYIMIDE AND RIGID-FLEx continues FeAtuRe