At values in excess of 80, the start pressure for tools and equipment increases to critical levels. This means that an 8″ ingot produces a total runout weight of 1.1 kg/m, and a 10″ ingot 1.7 kg/m.
At values below 7, the necessary mechanical conversion is insufficient to ensure the required material characteristics without implementing special measures. In the case of an 8″ ingot, this produces a maximum extrusion weight of 12.5 kg/m, and a for 10″ ingot a maximum of 19.6 kg/m.
To calculate the relative compactibility of an extrusion, you can use the numerical value obtained from the ratio total perimeter / extrusion weight for that extrusion. “Total perimeter” refers to the total interior and exterior perimeter of the extrusion.
This produces a form factor that can be easily compared with that of an existing extrusion. Although this method does not fully take into account factors such as a symmetry and uneven material distribution, it does provide a rough comparison value.
The lower the value, the easier it is to compact. Some comparison values are shown in the table below:
|Extrusion||Weight (kg/m)||Perim.(mm)||Form factor|
|Round stock Ø80||13,57||251||18,5|