Oatey H-2095 water soluble tinning flux cleans, tins and fluxes most commonly soldered metals including copper, brass, zinc, galvanized iron, lead and tin or copper-coated metals. Fluxing is a critical step in the soldering process. H-2095 tinning flux is lead-free and ideal for copper systems including fire sprinkler, hydronic heating, potable water service and DWV piping. H-2095 Tinning Flux remains active up to 700 deg F. H-2O95 Flux complies with CA and VT lead content regulations.