OSMOMAT 050 User Guide
Page 19 of 51
Version 1.1 (2011-10-12)
4.4.2 Conditioning the membrane
The membrane is placed with the shiny side onto the surface of distilled water while keeping the sup-
porting layer (dull side) dry.
The water penetrates the pores from below and displaces the glycerin. After a short time, small water
droplets are visible on the supporting side, and the membrane shows a slight discoloration.
The membrane remains on the water surface until it is evenly discolored. Depending on the pore di-
ameter, this can take from a few seconds to an hour.
Next, the membrane is completely submerged into the water and ready for installation into the mem-
brane osmometer for measurement of aqueous solvents.
It is important to install the membrane in the measuring cell with the active (shiny) layer
facing up.
If necessary, you can verify which of the two sides is the active layer.
Carefully remove the membrane from the water using tweezers. The active side of the membrane has
hydrophobic properties, while the supporting layer is hydrophilic.
Figure 4-4: Conditioned membrane
The white spot was caused by an air bubble located below the membrane. In this case, briefly lift up
the membrane, remove the air bubble, and wait until the membrane has an even gray coloring.
Summary of Contents for OSMOMAT 050
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