Hi Tungsten 19.3 g/cm^3 Titanium 4.54 g/cm^3 (if those are 100% that element) Stainless steel 2.6-3.3 g/cm^3 (depends on the alloy) -Bruce ************************************************************************ The RADSAFE Frequently Asked Questions list, archives and subscription information can be accessed at http://www.ehs.uiuc.edu/~rad/radsafe.html