Though some mechanical properties of amorphous ZIF-4 such as the Young's modulus or the fracture toughness 36 have been determined, studies are significantly scarcer than for crystals. There are only two reported values of a bulk modulus, which stems from computational studies with the stress-strain approach performed on the same Continuous Random , while a second one 39 reported K = 4.47 GPa and ρ 0 = 0.99 g cm -3 . However, the physical realism of the CRN model has not been thoroughly demonstrated in the first place, notably as it features a surprisingly low density. Additionally, the mismatch in reported K values was left unexplained in the latest study, leaving us with no reliable value.