How strong is tuff rock?

Tuff rock has geotechnical properties such as 18-25 kN/m3 of unit weight, 1.5 - 2.4 gr/cm3 of bulk density, 2.29 - 2.64 gr/cm3 of particle density, highly varied compressive strength depending on the degree of weathering, 0 - 1.45 MPa of cohesion, friction angle = 24° - 45° of friction angle, and 4% - 42% of porosity.