. Appalachian Green Technical Information (ASTM C97) Absorption by Weight,% 0.08 (ASTM C97) Density, Lbs/CuFt170.4 (ASTM C97) Specific Gravity 2.729 (ASTM C170) Compressive Strength, psi8580 (ASTM C241) Abrasion Resistance, Hardness 11.3 (ASTM C880) Flexural Strength, psi1854 (ASTM C99) Modulus or Rupture, psi 2029 Back to the products page .