Giallo Siena Technical data - ASTM standard Absorption (C97) 0.16 Weight% Density (C97) 2.674 Kg/cu.m Compressive strength (C170) 80.3 MPa Modulus of rupture (C99) MPa Flexural strength (C880) 156 MPa Abrasion resistance (C241) 12.7 Hardness   close