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April 2016 • The PCB Magazine 75 long-term thermal reliability of pCb materials (Aging Duration [hours]) in the Y-axis. These are presented in Figure 10 for each laminate. In this instance a linear fit was used for the data sets. Temperatures where 50% retention would be reached for 1368, 3192, 6384, and 12,768 hours were calculated using the linear equation generated for each laminate. For all laminates, 105°C was chosen for T1. Temperatures T2, T3, Figure 10a: Arrhenius Plots 1/Temperature (K) vs log (Aging Duration, hr.) for laminate A; Calculated 50% Eol. Figure 10b: Arrhenius Plots 1/Temperature (K) vs log (Aging Duration, hr.) for laminate B; Calculated 50% Eol. Figure 10c: Arrhenius Plots 1/Temperature (K) vs log (Aging Duration, hr.) for laminate C; Calculated 50% Eol.