Datasheet

Page 3
Dip Coating
Ensure that the coating material in the container has been stirred thoroughly and has been allowed to stand for
at least 2 hours for all the air bubbles to disperse. Conformal Coating Thinners (DCT) should be used to keep
the DCB coating at a suitable viscosity for dipping (180 – 250mPa s @ 20°C). DCT is added periodically as the
solvent evaporates. The viscosity should be checked using a viscosity meter or "flow cup". The board
assemblies should be immersed in the DCB dipping tank in the vertical position, or at an angle as close to the
vertical as possible. Connectors should not be immersed in the liquid unless they are very carefully masked.
Electrolube Peelable Coating Masks (PCM/PCS) is ideal for this application. Leave submerged for
approximately 10 seconds until the air bubbles have dispersed. The board or boards should then be withdrawn
slowly (1 to 2 s/mm) so that an even film covers the surface. After withdrawing, the boards should be left to
drain over the tank or drip tray until the majority of residual coating has left the surface.
0
50
100
150
200
250
300
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Viscosity (mPa s)
Temperature (⁰C)
Viscosity Change with Temperature - DCB
0
50
100
150
200
250
1:0 20:1 10:1 5:1 2:1 1:1 1:1.5 1:2 1:2.5 1:3
Viscosity (mPa s)
Mix Ratio - DCB:DCT
Viscosity Chart - DCB:DCT