Ametek mocon AQUATRAN 3/38 Operator's Manual page 37

AQUATRAN 3/38 Operator's Manual Testing Film Samples
If your sample is thin (less than 5 mils), you need only mask one side. Mount the sample in the test cell with
the film side facing up.
If your sample is thicker than 5 mils, mask both sides. Be sure the mask apertures are accurately aligned
and the edges around the foil aperture are tight against the film.
MOCON, Inc. Revision G 6-3