Foam glass is a highly efficient and ecologically safe insulating material made from pure glass in the form of foamed granules. Granules are made by thermal foaming of crushed glass mixed with kaolin, glycerin and liquid glass. Each foam glass granule has closed gas filled cellular structure, this allows keeping air inside each cell and that make foam glass an efficient insulating material.

The production technology of Penostek foam glass consists of the following stages: crushing and grinding of glass battle to obtain glass powder with a particle size of about 50 microns; mixing with a foaming agent; granule formation; heat treatment at temperatures above 800ºС in rotary or tunnel kilns to obtain granular or block foam glass.