442570 0.5mm Wire Lead solder, +183°C Melting Point. Tin lead solder, also known as soft solder, is an alloy suitable for high-quality work by professionals to repair or rework intermetallic bonds that require a low melting temperature. This solder wire enables you to achieve superior strength and thermal resistance. The flux properties in this product, are made from high-quality materials that are reliable and easy to use. Making it ideal for use by professionals for common electrical soldering.