Scrap metal is divided into two types, namely ferrous metals and nonferrous metals. Types of ferrous metals contain iron while nonferrous metals do not. There is also a further distinction for scrap metal when it comes to hazardous or special waste with examples including among others spent battery casings and the metal in waste oil filters.
If you have scrap metal lying around your garden or piled up in your garage do your part for the environment and have these removed correctly before they can contaminate your premises.