TABLE 9-3 Solder Acceptability, Intrusive Soldering, Un-Supported Holes1Criteria Class 1 Class 2 Class 3A. Wetting on solder source side oflead and barrel 2270° 270° 330°B. Percentage of land area coveredwith wetted solder on soldersource side 375% 75% 75%Note 1. Wetted solder refers to solder applied by the solder process.Note 2. The 25% unfilled height includes both source and destination side depressions.Note 3. Applies to any side to which solder paste was applied.Figure 9-2 4 Acceptable Wetting of Plated-Through Holes without LeadsFigure 9-3 5 Through-Hole Component Lead Soldering -Minimum Acceptability for Classes 2 and 3 Per Table 9-11. Vertical fill2. Solder destination side3. Solder source side