High level of protection with fast processing time

UV cure conformal coatings

Electrolube launched seven UV cure conformal coating products at Apex. Source: Electrolube

Electrolube, a manufacturer of specialist electro-chemicals, launched seven new generation UV cure conformal coating products at this year’s IPC Apex Expo. The exciting new UVCL range of UV cure conformal coatings is expected to take the US market by storm. Senior management from the company’s US operation in Texas, HK Wentworth America, Inc, and the senior technical team, discussed the advanced new UV cure coating range, as well as encapsulation resin and thermal management solutions, with visitors of the show.

These UV cure coatings are designed to offer the highest level of protection for electronic circuitry with an exceptionally fast processing time. The range features UVCL, a single component, medium-low viscosity dual cure coating with secondary moisture cure, for complete cure in shadow areas. Available in 5L packaging, UVCL is VOC-free, non-flammable and demonstrates excellent electrical properties. The coating provides a wide operating temperature range and is ready to use for selective spray application.

UVCL-P, the plus version, is a transparent, flexible coating which is extremely resistant to thermal shock. The main benefits are the improved coverage and protection achieved, along with a guaranteed chemical cure in 6 hours thanks to its unique secondary cure mechanism. Selectively applied at 50–150 microns thickness, the plus version will always afford a higher level of condensation protection than UVCL when sprayed at the same thickness. It also has a higher maximum operating temperature of 150 °C and meets the requirements of UL94V-0 at thicknesses below 150 microns and can be cured with either 365 nm LED lamps or ‘D’ bulb microwave technology.

The company has also developed an ‘xtra’ version, called UVCL-X, which shares the benefits of the plus version with excellent resistance to thermal shock, immediate board handling with a guaranteed chemical cure in 6 hours thanks to the unique secondary chemical cure mechanism and exceptional coverage and protection. Reflecting its environmental credentials as well as increasing the ease of inspection, UVCL-X is a green-opaque coating that can be applied at up to 300 microns and has a higher maximum operating temperature of 150 °C. It is a highly flexible coating that demonstrates excellent thermal conductivity 0.7  Wm-1K-1 for significantly improved heat dissipation. The coating is also UL746 qualified and meets the requirements of UL94V-0 at thicknesses below 300 microns.

Further UV cure coating products, also featuring secondary moisture cure, were launched at the show. This included a film coating product, UVCL-FC, which enables the application of even thinner coatings and faster curing line speeds. It is a low viscosity, fast-curing UV formulation for rapid processing. The company also showcased a

UV cure coating specifically for LED applications. The UVCL-LED coating is also a low viscosity coating that enables rapid cure with low energy 365nm LED lamps.

UVCL-HV is a high viscosity UV curable material, designed to provide better coverage of component leads and exposed metal surfaces during dispensing applications and the UVCL-Gel is a no-flow gel version, designed for sealing connectors and other areas that must not be coated.

Ron Jakeman, Managing Director, comments, “In order to meet the different requirements of electronics, LED and automotive manufacturers, we have invested in finding solutions to speed up production with ever higher levels of performance. This is an unbeatable range of conformal coating materials and we are very excited about launching it to the US market. The UVCL range is solvent-free, VOC-free and provides unsurpassed performance in harsh environments, including resistance to cracking during thermal shock cycling. The main benefit of the UV cure coatings is that boards can be handled immediately, with full cure guaranteed within 6–12 hours due to the chemical secondary cure mechanism. If we examine existing UV cure systems on the market, the majority require minimum moisture secondary cure times of 8–14 + days, whereas the UVCL range facilitates tremendous reductions in the amount of Work-in-Progress.”



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