[Zn(mIm)2] (where 2-mIm is 2-methylimidazole, see Methods). ZIF-62 and ZIF-4 are known glass-formers with melting temperatures of 430 and 593 °C, respectively . In contrast, ZIF-8 is known to decompose before melting (Td~450 °C) . We mix each of these three ZIF crystals with varying amounts (R=0.25, 0.5, 0.75, 1.0) of heterocyclic halide salts (Fig. ), where R is the molar ratio between the added amounts of ZIF crystal and modifier salt, i.e., R=[nmodifier]/ [nZIF]. We note that we mainly investigate the glasses with added benzimidazolium chloride salt for R=1 due to their lower hygroscopicity and thereby easier handling for all testing. However, to demonstrate the universality of our approach, we perform selected thermal, mechanical, and structural analyses for samples with varying R value and halide ion.