A comparison plot is shown in Figure with the faster permeating species (He) on the x-axis and the selectivity on the y-axis in a so-called Robeson-plot. Comparing our MMMs to MMMs containing other materials as fillers, such as CNTs (Carbon Nanotubes), MCM-41 (Mobil Composition of Matter No. 41), ZIFs and other nanocomposites, as well as to the polymeric membrane benchmark (Robeson upper bound) it is clearly visible that the MIL-116(Ga)-formate MMMs with 15 and 20 wt.% surpass the other materials by far. We also compare our MMMs with fluorinated membranes such as Nafion™, PFMMD (perfluoro(2-methylene-4-methyl-1,3-dioxolane) and our 15 and 20 wt.% MMMs entering in region of fluorinated membranes without having hazardous impact on both environment and humans during and after their production, eliminating effects of fluorinated forever-chemicals .