Flexible circuits are custom engineered parts built to a set of engineering and documentation requirements. The IPC?Association Connecting Electronic Industries, a global trade association for participants in the electronics industry, has created a specification document, IPC 6013, which is referenced for many flex circuit applications. This commercial document, in combination with the CAD data and print, is used as the product specification. Most flexible circuitry fabricators’ internal quality standards are based on IPC 6013. This document defines three classes of product specifications, with Class 3 often referenced for high reliability medical, military, and aerospace applications. In other applications, requirements may be specified with customized detailed documents. It is not unusual to see several different documents used to define requirements for a flexible circuit part number. The following is a typical list of documents that specify flexible circuit requirements in the high reliability markets:

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