A3.2.8 Clean the viscometer thoroughly by several rinsings
with the appropriate solvent completely miscible with the
sample, followed by a completely volatile solvent. Dry the
viscometer by passing a slow stream of filtered, dry air through
the viscometer for 2 min, or until the last trace of solvent is
removed. The use of alkaline cleaning solutions is not recommended
as changes in the viscometer calibration may occur.