2.4 What material are the CMRV helical worm gear units made of?

The CMRV helical worm gear units are made of an aluminium or cast-iron housing and are available in sizes 30, 40, 50, 63, 75, 80, 90, 100, 110, 125, 130, and 150. They are available with the following power output capacities: 0.09kW, 0.12kW, 0.25kW, 0.37kW, 0.55kW, 0.75kW, 1.1kW, 1.5kW, 2.2kW, 3.0kW, 4.0kW, 5.5kW, 7.5kW, and 11kW.