The main constituents of 20/80 soldering wires consist of tin sn and lead pb . The wire used for soldering is made high of uniquely labelled crafted with rosin and proprietary activators which provides rapid wetting and good spreadability. The wire is crafted using virgin tin/lead having 99. 9% purity. Health and safety this is not the case toxic however a certain amount of fumes will be generated, Therefore these fumes must be exhausted for the operator s safety. First aid measures eye contact i flush eye immediately with plenty of running including under eyelids, Ii contact doctor, Water for 15 minutes. Skin contact i wash with soap and water, Ii if you feel irritation on contact doctor, The skin. Inhalation i move the patient to a fresh air environment, Ii contact doctor. Ingestion i drink plenty ii contact, Of water doctor. Melting temperature range and specific gravity of solder alloy melting temperature range c, 183, 280. Specific gravity, 10. 20. Physical properties item,,> solder wire, Sn20/pb80 appearance,,> bright shinning. Melting point c,,> 183, 280. Specific gravity gm/cm3,,> 10. 2 tensile strength mpa/min.,,> 47. Recommended operation temperature of soldering,,> 375, 425 c technical specification physical properties,,> typical value rosin grade,,> ww per fed, Spec lll, R, 626 water extract resistively,,> 40. 000 ohm, Cm, Typical corrosion test,,> passes. J, Std, 004 ipc, Sf, 818 spreadability,,> more than 85%. Electromigration,,> passed. S. I. R.,,> passed.