>MATERIAL; TENSILE STRENGTH; MOD. OF ELASTICITY; DENSITY >UHMW; 4.75 KSI; 90 KSI; 0.034 >HDPE; 4.6 KSI; 170 KSI; 0.034 >6061-T6 ALUMINUM; 45 KSI; 10,000 KSI; 0.098 >1018 Cold Drawn STEEL; 64 KSI; 30,000 KSI; 0.283 Hmmm, something is wrong with those density numbers. If they were correct, steel would be lighter than balsa wood. Bruce in Houston