0.031" Diameter 63% Tin 37%Lead 1-Pound Solder Roll
Rosin "44"® is a high activity RA core flux designed for excellent instant wetting action, even on nickel surfaces. Although "44"® is a RA-based material, the residues are non-corrosive if not cleaned. Per J-STD-004B, "44"® is classified as ROM1 flux.