| | I need to set a cleanliness limit for our incoming boards. I know that some people use 14-10 microgr. sq. in. But how can I determine what is best for me. | | Can anybody tell me if there's a standard for this. | | Right now we are using an Alpha Ionograph but since our boards are coated with a rosin we are getting very high readings. Any ideas on how to set a cleanliness limit for these boards ??? | | Please Help | | Hi there ,
| Bernardo, | | I have some literature from Alpha that references 5ug/in2 max as a common specification. | | Chrys | |
I think we have a limit of 14 ugm/sq.in for MIL which is an aggressive plan for incomming -but we do launch an investigation if we find 7 ugm/sq.in in process after oxide process or before packing(PWB manufacturing).. Please look in Mil specs for rigid (MIL 50110)/ rigid flex (MIL- 50884) acceptance criteria and IPC . Hope that helps. Kc.
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