Glass foams were produced from discarded glass bottles (GB) and eggshells (ES) as foaming agent in contents between 1 and 30 wt%. The raw materials (GB, ES) were homogenized and uniaxially pressed (20 MPa). The obtained powder compacts were fired at 900 degrees C/30 min and characterized according to their chemical, physical and structural properties. The results (porosities between 60 and 95% with thermal conductivities between 0.177 and 0.055 W/mK and compressive mechanical strength between 0.15 and 1.50 MPa) indicate that the obtained glass foams have potential for applications where thermal and acoustic insulation and non flammability are the main technical requirements. (C) 2017 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.