 Industrial-scale melts have shown that a stable glass compound is formed even when the original melt mixture is up to 33-40% waste material by weight, depending on the type of waste.First, waste is mixed with soil containing glass formers in a large container installed with electrodes (electrical conductors) suitable for heating the mixture.The container used is either underground (subsurface planar vitrification, or SPV) or above ground (in-container vitrification, or ICV).