Issue link: https://iconnect007.uberflip.com/i/1137649
66 SMT007 MAGAZINE I JULY 2019 From Figure 7, Material D has somewhat less (although sufficient) volume consistently. All materials passed our internal specifications. From Figure 8, Material D has somewhat less (although sufficient) volume consistently. All materials passed our internal specifications. From Figure 9, Material D has somewhat less (although sufficient) volume consistently. All materials passed our internal specifications. Manufacturability Testing: Missing Print In this test, circular apertures 6–16-mils (0.15–0.40-mm) diameter are printed in three locations on the test board and inspected for missing print locations (Figure 10). The num- ber of missing prints for each aperture are counted. We do not expect the 6-mil (0.15- mm) apertures to print at all. There were no missing prints on any of the apertures from 8 mils (0.20 mm) to 16 mils (0.40 mm), so all materials pass (Figure 11). Figure 7: Solder volume box plots for the 12-mil (0.30-mm) aperture with an area ratio of 1.1. Material A is the control. Figure 8: Solder volume box plots for the 10-mil (0.25-mm) aperture with an area ratio of 0.5. Material A is the control. Figure 9: Solder volume box plots for the 8-mil (0.20-mm) aperture with an area ratio of 0.4. Material A is the control. Figure 10: Missing print test pattern.