As a Class 3 customer we are considering mandating transition from Type UR to Type AR conformal coating, to make it easier to replace failed components. Are there any Class 3 users of Type AR coating? What is track record for using Type AR? Are there any compatibility issues with certain types of solder masks? Any input you have would help. Another advantage with AR would be for returned equipment. The OEM could remove all the coating from an assembly using alcohol, then perform
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bed-of-nails testing to quickly identify failed components.