This study proposes a new strategy for achieving rapid volumetric heating of moldable lowdielectric -loss glass over a wide temperature range using only microwave sources. As a proof of concept, both multi -physics modeling and experimental demonstration of microwave heating (MWH) of Pyrex 7740 glass are performed. The results reveal that there is an activation threshold of 400 degrees C for this glass, i.e., below this threshold the glass is mainly heated by SiC molds through interfacial heat transfer, while above it the glass can be directly heated by 2.45-GHz MWs volumetric dielectric loss....