Conformal Coating

Conformal coatings are often applied to PCB/FPC assemblies for the purpose of providing electrical insulation, supplying protection against environmental elements, and enhancing resistance to mechanical vibration. These coatings “conform” to the various component geometries on the populated circuit board. While they are intended to be impermeable barriers, conformal coatings must be breathable to allow trapped moisture on the PCB surface to migrate away from active conductive paths. To minimize the risk of trapped moisture, it is recommended that manufacturers properly clean and dry their boards prior to coating. Coating adhesion can also be significantly improved when they are applied to clean, dry boards and films.

Panacol-USA’s solvent-free conformal coating adhesives of the Vitralit® line consist of light curable acrylated urethanes and cationic epoxies. The acrylated urethanes include products that possess high flexibility after cure, what makes them ideal for flex circuits and PCB’s with delicate components and thin gage wire leads. Curing in seconds under moderate intensity UV/Visible light, these coatings yield dry, tack-free surfaces. They are highly moisture resistant, and their low Shore A-scale hardness makes them easier to remove for localized repair.

Conformal Coatings of the Vitralit® line cure fast under UV light

Cationic epoxy coatings are typically more durable by nature, offering higher resistance to extremely harsh operating environments and chemicals. They cure with UV light, and produce dry, tack-free surfaces. In the event that UV exposure is prematurely terminated, the initiated cationic curing process will continue to completion in the areas previously illuminated. This provides an added degree of assurance that full cure is consistently attained in the established bonding process.

View the conformal coating selections listed below for a possible candidate for your application. Please contact Panacol-USA to confirm your product selection and to secure additional application assistance, including samples and process recommendations. In the event that these standard products do not satisfactorily address your performance requirements, Panacol-USA will investigate other solutions that include development of adhesive specifically tailored to the complexity of your application.

The table below lists a selection of Panacol adhesives suitable as conformal coating. Further products and custom solutions are available on request.

Adhesive Application Viscosity [mPas] Base Curing*
Vitralit® 1671 glob top encapsulation
conformal coating
encapsulation of electronic components
chip encapsulation
potting material
attaching components on PCBs
SMD assembly
display sealing
smart card
250,000-300,000 epoxy UV
thermal
Vitralit® 2004 F conformal coating
encapsulation of electronic components
potting material
automotive, aerospace
60-100 epoxy UV
thermal
Vitralit® 2007 F conformal coating
encapsulation of electronic components
potting material
automotive, aerospace
200-500 epoxy UV
thermal
Vitralit® 2009 F conformal coating
encapsulation of electronic components
potting material
automotive, aerospace
100-200 epoxy UV
thermal
Vitralit® 2028 conformal coating
encapsulation of electronic components
potting material
glass bonding
automotive, aerospace
160-300 epoxy UV
thermal
Vitralit® 4451 conformal coating
plastic bonding
plastic film lamination
dome coating
500-800 acrylate UV
Vitralit® 90024 Conformal Coating
Vitralit® 90034 Conformal Coating
Vitralit® 90084 Conformal Coating
Vitralit® UD 8050 Conformal Coatings shear thinning acrylate UV
VIS
moisture

*UV = 320 - 390 nm          VIS = 405 nm

To download the technical datasheets (TDS) please click on the adhesive name.