The 4000 series aluminum coil is an Al+Si alloy (silicon content between 4.5-6.0%), which is an aluminum alloy with a high silicon content. This aluminum alloy with silicon as the main alloying element cannot be strengthened by heat treatment. Mostly used for construction and some mechanical parts.

4 series aluminum coils have the characteristics of low melting point, high temperature resistance and wear resistance, and are often used as welding materials.

The representative models of 4 series aluminum coils are 4a01 aluminum coil, a4043 aluminum coil, 4300 aluminijska zavojnica, 4032 aluminijska zavojnica, 4 niz 4343 aluminijska zavojnica, 4 series 4A17 aluminum coil, 4 series 4A11 aluminum coil