We work to the requirements of J-Std-001B and we use historical data and trend analysis to determine our testing frequency. We set up process control limits that are within the maximum contamination limits in table 5-1 of this spec. For us, Copper is generally the contaminant that will trigger replacement or replenishment Dan Botts Hughes Training Inc. Irving Tx. [log in to unmask] ______________________________ Reply Separator _________________________________ Subject: [TN] frequency of solder pot content analysis Author: "TechNet Mail Forum." <[log in to unmask]>, Ken Patel <[log in to unmask]> at CCGATE