Solvent-based varnish for electronic components (PCB)

Coating Application - Viscosity solution for electronic boards' solvent – based coating (PCB)


Solvent dosage, a flow characteristic of the coating solution, requires precise adjustment and can be regulated. By maintaining a constant viscosity, varnish coating uniformity is achieved.

A non-homogeneous coating (excessively thick or thin), causes major issues. A company's reputation can be compromised due to customer claims regarding poor product quality, and a company's overhead will increase due to inefficient production and losses in raw materials.

Installation a MIVI process viscometer on the coating circulation loop allows timely solvent dosage injection to the base resin throughout the entire production batch or process.


PCBs dipped in a resin base coating and solidified at room temperature gave the following results:

  • 100% quality in coating uniformity
  • Optimization of base resin
  • Reduced solvent consumption

The inline MIVI viscosity sensor provides constant varnish viscosity measurements, reduces the consumption of raw materials, and increases monetary savings regarding time / overhead.

Given the elevated technology and high value of the PCB, a rejected batch, operators' extra time, and consequent production downtime would equal enormous losses.

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Expertise and innovation in viscosity measurement and control

"Sofraser sensors deliver instantaneous measurement and efficient analysis such as dynamic viscosity, kinematic viscosity, concentration, phase detection, density etc.

Whatever the industry, our experienced team understands and develops solutions for numerous applications."

Dr Philippe BURG
Sales & Applications Manager