No Clean 277 is a water-based VOC-free flux that performs reliably equal or superior to many alcohol-based fluxes. Being a medium-solids residue flux it has an exceptionally durable and powerful activator system, ideally suited for high thermal mass assemblies such as backplanes, power management, servers, and palletised assemblies, whilst also withstanding the high solder temperatures required for selective soldering. 277 can be used with all common lead-free wave soldering alloys, including tin-silver-copper, tin-silver, tin-copper, and others. Optimised for flux spray applications, it has been proven to reduce equipment maintenance. Remaining 277 residues may be cleaned only if critical to the product application.