1. Revise the original industry standards based on the latest technical data, production processes, and product performance characteristics of ordinary phosphor copper anodes; 2. Supplement the content of the original industry standards based on the technical data, production processes, and product performance characteristics of microcrystalline phosphor copper anodes , to suit the board manufacturing requirements of high-performance PCB. -------- This standard replaces CPCA 4305-2005 "Phosphorus Copper Anode". Compared with CPCA 4305-2005, the main changes in the content of this standard are as follows:
——The relevant numerical values have been modified according to the provisions of GB/T 8170-2008 "Numerical Rounding Rules and Representation and Judgment of Limit Values" (see 3.2. 1);
——Added the classification of phosphor copper anodes according to average grain size (see 3.1);