... on zinc with 2 to 15% aluminum, content of cored flux is 10 ~ 20% (weight Product Name: seamless cored copper-aluminum ... on zinc with 2 to 15% aluminum, content of cored flux is 10 ~ 20% (weight percent), Advantage: smooth surface, good solderability ... wire and aluminum alloy wire. Because this product is seamless, flux will not absorb water then be oxidized. ,it have the ...