This section contains lists of standard formulae that are commonly used in the extrusion industry, and other useful formulae.
Conversion formulae
The following equations are useful for converting imperial units to metric and vice-versa.
Millimetres (mm) =
Metres (m) =
Kilograms (kg) =
Weight (kg/m) =
A simple formula can be used to find the weight per metre of a section by multiplying the area by a constant factor of 0.00271.
W = Weight in kg/m A = Cross section area in mm 2 0.00271 is the specific gravity of aluminium x 10 -3
Using this expression equations for all the different sections available can be derived.
A = Cross section area in mm 2 r = radius
Copyright 2004 
