There are two methods for controlling viscosity with conformal coating materials and dip coating applications.
The first is flow cup control which is a manual process. A cup of known size with a hole in the centre is filled with the conformal coating and the time for the material to run out is related to viscosity. This is reasonably accurate and normally is suitable for most applications.
An alternative is inline viscosity control of the conformal coating where the solvent evaporation and material top up is controlled by a viscometer and plc controlled system. This is extremely accurate and removes all of the manual processes involved in testing with a flow cup.
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