SOLDER RESISTANT COATING FOR CIRCUIT BOARD

Solder resistant coating for circuit board.  Consists of acrylic resin, green pigment, 5% by weight Cab-o-sil and acetone.  Product 35,000 cps.

PROBLEM:

Disperse Cab-o-sil and pigment into resin-solvent mixture.  Desire smooth coating.

RESULTS:

AB MIXER:

Model 3 x 1.5 toothed impeller/liner, 7.5 HP, 3600 RPM, full open grid.  Recirculating to agitated tank.