A.4.1 Preparation of apparatus and sample containers. All
components of the filtration apparatus (except the vacuum flask), sample
containers, and their caps must be cleaned as described in ASTM D5452. All
metal parts of the filtration apparatus are to be electrically bonded and
grounded, including the fuel sample container and the metal insert ring, if
used. See ASTM D5452 for other safety precautions.