SKC Limited EPAM-7500 - Manual (Page 52)

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5 Put two or three drops of the solution on the impaction cup.
The drops should saturate the disk, flowing freely to the edge.
6 Let the impaction cup “dry” by allowing the solvent to
volatilize, leaving a thin film of grease on the impaction cup.
7 Replace the impaction cup onto the impactor jet. Re-insert
the impactor into the impactor sleeve.