An aluminum plastic pipe, also known as an aluminum composite pipe (ACP), is a type of piping material that consists of layers of aluminum and plastic. It is commonly used for plumbing and heating applications due to its lightweight nature and corrosion resistance. The structure of an aluminum plastic pipe typically consists of an inner layer made of cross-linked polyethylene (PEX) or polybutylene (PB) plastic, an intermediate layer of aluminum, and an outer layer of plastic. This combination of materials provides strength and durability while maintaining flexibility.