The higher the Poison ratio at low temperature, the better the ductility (Pugh, 1954). For a ductile material the Poison ratio is 0.33 and above.

For ductile material, the B/G is > 1.75 while the G/B is < 0.5.

So, if a calculation for a chosen material, one obtained the following results:

Poison ratio = 0.26, B/G = 1.79 and R/G = 0.56, to what class does the material belongs?