Nokorode hot weather flux is a lead free, soft soldering paste flux especially formulated to remain thick in hot weather applications. It is ideal for use with 95/5 and other common solders. It cleans and fluxes the joint area all at one time. When heated, it reduces the surface tension in the joint and allows the solder to flow easily and uniformly into the joint. Nokorode hot weather flux works to deliver a strong, leak-free joint. It's non-aggressive formula is ideal for use on copper and brass fittings.