The metal-organic framework (MOF) field has attracted great interest in recent years, thanks to their exciting properties suitable for many applications such as heterogeneous catalysis, drug delivery or gas storage. MOFs are a class of hybrid materials formed by the self-assembly of an organic linker and an inorganic metal cluster, culminating in open 3D architectures with large surface areas and pores. However, their microcrystalline powder natures present difficulties for their industrial implementation, due to weak mechanical performance. To address these issues, the preparation of MOF composites, i.e. MOFs embedded within a more-easily processable material matrix such as graphene oxide or polymers, has gained increasing attention. Recently, glasses formed by melt-quenching zeolitic imidazolate frameworks (ZIFs) have been demonstrated to offer promising mechanical properties. ZIFs are a subgroup of highly thermally stable MOFs, composed of metal cations tetrahedrally coordinated through imidazolate linkers. The use of ZIF glasses as matrix materials within MOF composites can, for example, stabilize a metastable phase of MIL-53 at room temperature. However, examples of melt-quenched ZIF glasses remain relatively rare and therefore their use as composite matrices is not a widely applicable approach. In contrast, inorganic glasses are a broad family of materials with a vast number of applications, ranging from commodities such as architectural or container glasses to specialty glasses widely employed in biotechnology, photonics, nuclear waste management or solid-state electrolytes. In general, inorganic glasses avoid crystallisation either by having complex chemical compositions, also called "principle of maximum confusion", or by kinetically frustrating the crystallisation process by cooling the melt beyond its critical cooling rate. They are relatively cheap and well-studied materials, though they are almost completely unexplored as host materials for crystalline MOFs. No example of successful composite formation is known to the authors at the time of writing.