Why are Goldacres outer boom sections constructed from aluminium?

Aluminium is lightweight which reduces the overall boom weight and stress on all components as well as improving the boom ride and stability when in operation. The lighter weight reduces the inertial forces on the boom centre section, making it easier to control yaw movement of the boom, reducing over and under application, a major contributor to poor chemical performance. Aluminium also offers an extremely high level of chemical resistance which assists in achieving a long boom life.