Many industrial uses still exist for this easy-to-use Flux-'N-Solder combination. Unlike E-127, this formula contains 50/50 powdered solder (50% lead), and therefore must not be used when soldering drinking water systems, food handling equipment, livestock tanks, etc. Due to its relatively low melting temperature (360 to 420 ° F) and its rapid tinning action, this paste is excellent for soldering automotive components and other assemblies. Residues are water soluble and should be removed after soldering.