Just as a note on Graham Naisbitt's response, the test method he quotes is
residual rosin by UV-Vis spectroscopy.  The pass-fail limits are based on
RA flux from the first IPC Cleaning and Cleanliness Test Program
(IPC-TR-580).  For OA and no-clean fluxes, this test is largely
meaningless.

Doug Pauls
Rockwell Collins

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