The soldering process is widely used in the electronics industry for electrical connections such as joining components to printed circuit boards. It also has much wider applications outside industry, in domestic settings and even in the manufacture of jewellery. Solder is a metal alloy made of tin and lead which is melted with a hot iron that has been heated to temperatures in excess of 600 degrees Fahrenheit. The molten solder is then applied as an adhesive agent to different types of metal and as it cools it creates a strong electrical bond. One of the most useful aspects of soldering is its reversibility - the solder can be removed to separate materials and components.