Viscosity Control System from Nordson ASYMTEK

Viscosity Control System

The Viscosity Control System maintains consistent temperature of conformal coating fluids. The system includes a heated recirculating fluid circuit to eliminate viscosity changes in temperature-responsive materials. Close-range temperature monitoring keeps the coating process consistent and stable.

Additionally, emissions of Volatile Organic Compounds (VOCs) may be reduced, depending on the fluid properties. Certain factors like ambient temperature changes and different material lots cause viscosity fluctuations. These fluctuations affect the performance and consistency of coatings applied to printed circuit board assemblies.

By controlling the temperature of the conformal coating fluid circuit, viscosity fluctuations can be reduced. With Nordson ASYMTEK's Viscosity Control system, fluid is heated and recirculated while being monitored closely and maintained at set parameters. The system includes an over-temperature alarm as well as precise, closed-loop controls to maintain the process temperature at +/- 1 degree C.

Solvent usage may be reduced since heat thins the coating material. As a result, higher film builds can be achieved in one pass because with less solvent there are more solids in the coating material. For more advanced process control, the Viscosity Control System can be combined with the Nordson ASYMTEK Laser Fan Width Control option (Laser Fan Width Control automatically verifies fluid fan width). This combination allows users to perform process checks on the spot and as part of pre-programmed, regular equipment operation. Parameter settings are automatically adjusted quickly and efficiently, without operator intervention.

The Viscosity Control System is an option on the SL-940E and SL-941E systems with the SC-204/SC-104 or SC-280C applicators.


  • Provides process control for conformal coating to ensure consistent coverage
  • Eliminates viscosity changes due to ambient temperature fluctuations
  • Keeps fluid at a constant temperature, within 1 degree C
  • Protects material with an overtemperature alarm

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