https://www.avient.com/knowledge-base/article/specific-gravity-tpe-selection?rtype[]=1164
XL9070: 24.6 cm^3 x 0.89 = 21.8 g
G7970: 24.6 cm^3 x 1.18 = 29.0 g
For an annual number of units required of 500,000 parts per year, a buyer would require the following pounds of material excluding runner system and scrap (454 g/lbs conversion factor):
XL9070: 21.8 g / 454 g/lbs x 500,000 = 24,008 lbs
G7970: 29.0 g / 454 g/lbs x 500,000 = 31,938 lbs