Does the Industry Need Standard Bare Board Cleanliness Requirements?Author: Don Dupriest
Company: Lockheed Martin Missiles and Fire Control
Date Published: 11/18/2014 Conference: Symposium
The IPC 5-32c Bare Board Cleanliness Assessment Task Group committee has released a number of guideline documents and test methods to support bare board cleanliness. Among these is IPC-5701 “Users Guide for Cleanliness of Unpopulated Printed Boards”, IPC-5702 “Guidelines for OEMs in Determining Acceptable Levels of Cleanliness of Unpopulated Printed Boards”, IPC -5703 “Cleanliness Guidelines for Printed Board Fabricators”, and IPC-5704 “Cleanliness Requirements for Unpopulated Printed Boards”. However, the top level IPC-6010 series of performance standards utilized for procurement of bare boards have not changed the default requirement related to a minimum level of final cleanliness. In fact, currently No level of cleanliness is mandated for bare boards as a standard requirement. Currently, final bare board cleanliness level is AABUS (As Agreed Between User and Supplier). Therefore the “User” must flow down to the manufacturer specific requirements for cleanliness levels should a minimum acceptance level of verification be required. Establishing a minimum cleanliness level deemed “acceptable” across a broad range of product classifications and end uses can be difficult. In complex system level procurements flow down of a cleanliness requirement may not get consideration. Establishing a level(s) of reasonable expectation for bare board cleanliness by product classification could ease this liability. This presentation will provide a look into proposed changes under development for new bare board cleanliness requirements as considered by the Rigid Printed Board Performance Specifications Task Group (D-33a) of the Rigid Printed Board Committee (D-30) for review. The expected results of this presentation are to solicit discussion among a broad range of users present as to the desire to see changes implemented among the top level bare board performance standards.
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