Definition

IPC Class 2 defines acceptance criteria for dedicated service electronic products where continued performance and extended life are required, but not critical. This covers most commercial and industrial electronics: computers, telecommunications, instrumentation, and business machines. Class 2 allows some imperfections that would be rejected in Class 3, with minimum annular ring of 50 µm (vs. 75 µm for Class 3). Most commercial PCBs are manufactured to Class 2 requirements unless higher reliability is specified.