In recent years, sintering strategi

In recent years, sintering strategies such as cold sintering process (CSP), hydrothermal hot pressing (HHP), and reactive hydrothermal liquid-phase densification (rHLPD) that enable the densification of ceramics at low temperatures, roughly speaking below 500 ˚C, broadly called as cold sintering techniques, have been proposed [1–3]. While there are several studies related with the processing of ceramic components, the works related with the densification of glass artifacts at low temperatures are only limited by the HHP technique [1,4] or to silica [5–8]. For example high level radioactive waste were immobilized in the glass bodies via HHP, and the formed artifacts demonstrated low radioactive element leachability [9]. Nevertheless, for HHP a specially designed apparatus is needed while CSP can be conducted by using ordinary presses, and as far as the authors aware, there has been no report on the CSP of the glasses. Accordingly, in this work, the densification of recycled soda lime glass powder via CSP was investigated for the first time.