24-5050-2437 is a 3.3% acid-cored wire with Sn50Pb50 as its alloy material. It has 3.00mm (0.125in) diameter and weighs 1lb per spool. is a highly active, inorganic acid type of flux developed for general-purpose soldering applications where a flux-cored solder wire is desirable. Acid core possesses excellent thermal stability to function under prolonged high temperature conditions as with torch or flame soldering. It is not recommended for electrical or electronic soldering applications due to the corrosive nature of the residue. Acid core is classified as INH1 per J-STD-004.