04-6040-0050 is a zero halogen, tin lead (SnPb) ultrapure solder bar with Sn60Pb40 as its alloy material. The bar weighs approximately 0.75kg (1 2/3 lbs). Kester Ultrapure is the industry standard bar solder for use in high tech electronic applications where lower surface tension and hole filling ability are essential. The purity of Ultrapure meets the requirements of IPC/J-STD-006C.