Glass Composite Materials (GCM) are materials defined as any material that contains both a crystalline and a glass phase, and current terms used in literature as to describe them are glass bonded waste form, glass encapsulated waste forms, glass ceramic, or glass material to name a few. Current glasses, with a few exceptions, are completely homogenous and so the alteration mechanisms are well studied allowing their long-term durability (up to several thousand years) to be apprehended. Due to this, crystallisation has always been regarded as undesirable process as it has the potential to alter the composition and hence the performance of the wasteform. The main goal of this project is to investigate the possibility of using GCM’s as a wasteform