Definition

IPC-6013 is the qualification and performance specification for flexible and rigid-flex printed boards. It classifies flex circuits by type (based on layer complexity) and usage class (based on flex requirements). The specification addresses coverlay integrity, stiffeners, bend radius, flex endurance, and acceptable flex-specific defects like cracks in bend areas. If you're designing flex or rigid-flex, your fabricator should be certified to IPC-6013. Specify the flex type (1-4) and class to ensure the board survives its intended flexing cycles. Current version is IPC-6013E (2021).