With an infinite recyclable life, copper is used and reused in motors, computers, construction, industrial machinery and more. One of the main factors of grading any metal is the level of impurities. Impurities for copper include things such as brass fitting, steel cords, solder welding, plastic coating, lead armour or other attachments that are used when the product is manufactured. Obviously the less attachments, the cleaner the copper, the higher the value of your copper scrap!