New two-part UV cure conformal coating

Louise Smyth

Following the successful launch of its 2K conformal coating materials, Electrolube is launching an addition to the range, 2K850. This new UV cure coating will make its debut alongside a selection of new conformal coatings and encapsulation resins at Productronica 2017.
The new solution combines the features and benefits of the 2K system, with the speed and convenience of UV cure, enabling an immediate tack-free coating. Once the two components are mixed, the system guarantees complete cure at room temperature within 24 hours by a predictable chemical reaction thereby enabling board calibration or further processing. In contrast, most single part UV cure systems currently available require moisture to diffuse through the UV cured coating sections. If the material is a decent barrier to humidity, full moisture cure beneath components can be measured in weeks or even months for some components. For sensitive designs, the constant changes in material properties, as the moisture-cure process progresses can affect calibration. In a production scenario, this extended cure time can impact the amount of Work in Progress (WIP) and require excessive buffering.

The 2K850 system features a wide operating temperature range of -40 to +130°C with excellent thermal shock performance. It is a tough, flexible, high performance coating, which also provides the protection of a resin with the ease of application of a conformal coating. The UL94V-0 compliant coating is characterised by greater coating thickness, enhanced edge coverage and improved adhesion, hardness and scratch resistance. Ultimately, this coating provides a consistent and completely reliable chemical cure.