Effective on most metals, excluding aluminum and stainless steel
Compatible with common plumbing solder alloys
Can be used on copper piping without discoloration
Good for large diameter copper piping
100% lead-free paste cleans, fluxes and copper piping to provide uniform solder flow

Solder paste flux water soluble - professional grade"h-20-5 inches bulk less brush size 1.7 ounces Cleans, removes oxidation, makes solder flow smoothly. Works with all solid wire solders. White paste with low odor. For potable plumbing, copper fire sprinkler and hydronic heating systems. Meets ASTM B-813 standard. IAPMO listed.