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Table 1 Copper concentration of the individual spectra through the solder mask profile displayed in Fig. 3

From: Influence of copper layer on epoxy acrylate based solder mask surface chemistry and the effect on epoxy adhesion

Label Spectrum 1 Spectrum 2 Spectrum 3 Spectrum 4
Cu/wt% 80 22 12 9
  1. Base level of copper concentration arises from the pigment phthalocyanine-copper complex and is calculated to approx. 0.1–0.3 wt%