Robert O’Rourke Density Document
Dura-Bar is lighter than steel. It is approximately 10% lighter because of the graphite.
Ductile iron has higher carbon additions than gray iron and has a lower density. Steel
does not have any graphite causing it to be more dense than either gray or ductile iron.
Density is expressed in weight per unit of volume and in the US system of measurement,
the most common units are pounds per cubic inch, or C. The density in metric units is
expressed as grams per cubic centimeter. To convert to gms/cc, multiply lbs/in3 by
27.68. To convert to lbs/in3, multiply gms/cc by .0361.