Printed Circuit Board Fabrication


Printed Circuit Boards (PCB) is the core of everyday life as most electrical devices can not function without one. From everyday life to military and medical situations, a PCB must be able to withstand the wear and tear of time and other elements. Conformal coating is designed to protect Printed Circuit Board (PCB), and related equipment from their environment. Typically applied at 0.001 inches to 0.003 inches on the PCB. It is a protective nonconductive dielectric layer that is applied to the assembled printed circuit boards to protect the electronic product from damage due to contamination, salt spray, moisture, fungus, dust, and corrosion caused by the harsh or extreme environment.

Solder Mask on Printed Circuit BoardsACME PCB Assembly happens to offer three different kinds of conformal coating for our valuable customers. The acrylic conformal coating is a low viscosity coating that is cured through drying and isn’t too resistant to chemicals but hardens quickly. The Urethane conformal coating is also a low viscosity coating, however, is cured through crosslinking with strong resistances to chemicals. Silicone conformal coating is a very viscous coating that is applied through swirl technology with high chemical resistances.

Below is a graph that shows the characteristics of the conformal coatings ACME PCB Assembly provides.

Acrylic conformal coating Urethane conformal coating Silicone conformal coating
Viscosity Low Low High
Typical applicator technology Film coating Film coating / Swirl Swirl
Curing Drying Crosslinking Crosslinking
Volatile Organic Compound (VOC) Yes Yes No
Chemical resistance Low High High
Thermal span Low Low High
Glass Transition Temp Low Low N/A
Repairable Solvents Solvents & Mechanical.


May result in stratified coating after repair.


Solvents & Mechanical.


May result in stratified coating after repair.


Call 310-715-1898 or email for a free quote.