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OX-TRAN Model 2/28 Operator's Manual
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.
Optional Reduced Test Area Dual-Film 5cm
For samples that are small or having high transmission rates, a specially designed Dual-film cartridge with
5cm
2
test areal can be used. Refer to a separate User Guide 054-502 for details.
Orienting the Sample
When mounting test samples, orientation can be important. Edge leakage or oxidation on some materials
can affect the test result. It is important to place the "barrier side towards the carrier". Follow the guidelines
below to minimize edge leakage and oxidation effects.
Homogeneous Materials
If you are testing a homogeneous, one-layer sample, the orientation of the sample in the cell
is not critical.
Multi-Layered and Laminated Materials
Install a multilayered film or laminate with the barrier coating or laminate up, toward the top of
the cell. For example, a one-sided, PVDC-coated paper should be mounted with the PVDC
side up, placing the PVDC towards the carrier gas.
Metalized Materials
Insert the film into the test cell with the metalized side towards the carrier gas to prevent
oxidation.
MOCON, Inc.
2
Cartridge
Revision J
Testing Film Samples
5-3
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