Oatey, 30011, 1.7 OZ, No. 5 Lead Free Solder Paste Flux. Cleans and fluxes at the same time. Effective on all metals except aluminum, magnesium and stainless steel. 100% lead free. Blended to clean surface oxidation. Formulated with high flash point, and stays in suspension under normal weather conditions and temperatures. Blended to clean surface oxidation and provides superior wetting properties which allow better solder flow. Surrounding metal is coated to help prevent copper from turning green.