• Felicia Cosmulescu Cosfel Actual SRL Bucharest
  • Sorin Mircea Axinte Daily Sourcing & Research SRL Bucharest
  • Lucian Paunescu Daily Sourcing & Research SRL Bucharest
  • Marius Florin Dragoescu University POLITEHNICA of Bucharest
Keywords: glass foam, microwave heating, glass waste, sodium silicate solution, sodium borate, mechanical strength


Another experimental application of the nonconventional microwave heating technique in the manufacturing process of a porous glass foam with high mechanical strength confirmed the high energy efficiency of this procedure compared to the conventional techniques.  The specific energy consumption of the manufacturing process was very low (0.72-0.73 kWh/kg).  Due to its physical, thermal, mechanical and microstructural characteristics (apparent density of 0.23-0.27 g/cm3, porosity of 87.7-89.5%, thermal conductivity of 0.063-0.070 W/m·K, compressive strength of 6.4-6.8 MPa and pore size between 0.2-0.6 mm) the product can enter in the foam glass gravel category usable as a thermal insulating material in construction in application fields that require mechanical, chemical and thermal shock resistance.


1. Lagaly, G., Tufar, W., Minihan, A., Lovell, A., Silicates in Ullmann’s Encyclopedia of Industrial Chemistry, Wiley-VCH, (2005).
2. Zhigulina, A., Mizuriaev, S., Technology of obtaining thermal insulation material on the basis of liquid glass by a method of low temperature processing, MATEC Web of Conferences, Vol. 117, XXVI R-S-P Seminar, Theoretical Foundation of Civil Engineering, (2017).
3. Abdel Alim, D., Production and characterization of foam glass from container glass waste, PhD Thesis at the American University in Cairo (Egypt), July (2009).
4. Chakartnarodom, P., Ineure, P., Foam glass development using glass cullet and fly ash or rice husk ash as the raw materials, Key Engineering Materials, Vol. 608, pp. 73-78, (2014).
5. Ayadi, A., Stiti, N., Benhaoua, E., Boumchedda, K., Lerari, Y., Elaboration and characterization of foam glass based on cullet with addition of soluble silicates, Proceedings of the International Conference on Advances in Materials and Processing Technologies, Vol. 1315, No. 1, Paris, France, October 26-27, (2010).
6. Eidukyavichus, K. K., Matseikene, V. R., Balkyavichus, V. V., Shpokauscas, A. A., Use of cullet of different chemical compositions in foam glass production, Glass and Ceramics, Vol. 61, No. 3-4, pp. 77-80, (2004).
7. Hesky, D., Aneziris, C.G., Gross, U., Horn, A., Water and water glass mixtures for foam glass production, Ceramics International, Vol. 41, No. 10, Part A, pp. 12604-12613, (2015).
8. Owoeye, S.S., Matthew, G.O., Ovienmhanda, F.O., Tunmilayo, S.C., Preparation and characterization of foam glass from waste container glasses and water glass for application in thermal insulations, Ceramics International, February (2020).
9. Cosmulescu, F., Paunescu, L., Dragoescu, M.F., Axinte, S.M., Comparative analysis of the foam glass gravel types experimentally produced by microwave irradiation, Journal of Engineering Studies and Research, Vol. 26, No. 3, pp. 58-68, (2020).
10. Geocell Foam Glass Gravel-High performance in every aspect, July (2017). https://www.GEOCELL-UK-Brochure-July-2017.pdf
11. Glapor Schaumglasprodukts, Foam glass gravel.
12. Glamaco-Section Foam Glass,(2018).
13. Engineering companies which build cellular glass production lines, Belglas, November (2016).
14. Scarinci, G., Brusatin, G., Bernardo, E., Cellular Ceramics: Structure, Manufacturing, Properties and Applications, Scheffler, M., Colombo, P. (eds.), Wiley-VCH Verlag GmbH & Co KGaA, Weinheim, Germany, pp. 158-176, (2005).
15. Zhou, J.E., Liu, K., Dong, W.X., Bao, Q.F., Zhao, T.G., Wang, Y.Q., Effect of CaO-Li2O-K2O-Na2O fluxing agent on the properties of porcelain ceramic tiles, Key Engineering Materials, Vol. 655, pp. 258-262, (2015).
16. Clayton, G.D., Clayton, F.E., Party’s Industrial Hygiene and Toxicology, Vol. 2A, 2B, 2C: Toxicology, 3rd edition, New York, John Wiley & sons, p. 2066, (1981-1982).
17. Da Silva, R.C., Kubaski, E.T., Tebcherani, S.M., Glass foams produced by glass waste, sodium hydroxide, and borax with several pore structures using factorial designs, International Journal of Applied Ceramic Technology, Vol. 17, No. 1, pp. 75-83, (2020).
18. Dragoescu, M.F., Paunescu, L., Axinte, S.M., Sebe, A.C., Dense glass foam with high mechanical strength produced from glass waste in microwave field, Proceedings of 1st International Conference on Emerging Technologies in Materials Engineering EmergeMAT, p. 33, Bucharest, November 14-16, (2018).
19. Paunescu, L., Dragoescu, M.F., Paunescu, B.V., Foam glass gravel made from glass waste by microwave irradiation, Constructii, Vol. 20, No. 1-2, pp. 35-41, (2019).
20. Bernardo, E., Cedro, R., Florean, M., Hreglich, S., Reutilization and stabilization of wastes by the production of glass foams, Ceramics International, Vol. 33, No. 6, pp. 963-968, (2007).
21. Paunescu, L., Dragoescu, M.F., Axinte, S.M., Cosmulescu, F., Unconventional technique for producing borosilicate glass foam, Journal La Multiapp, Vol. 1, No. 6, pp. 12-22, (2020).
22. Jones, D.A., Lelyveld, T.P., Mavrofidis, S.D., Kingman, S.W., Miles, N.J., Microwave heating applications in environmental engineering – a review, Resources, Conservation and Recycling, Vol. 34, pp. 75-90, (2002).
23. Kitchen, H.J., Vallance, S.R., Kennedy, J.L., Tapia-Ruiz, N., Carassiti, L., Modern microwave methods in solid-state inorganic materials chemistry: From fundamentals to manufacturing, Chemical Reviews, Vol. 114, pp. 1170- 1206, (2014).
24. Manual of weighing applications, Part 1-Density, (1999).
25. Anovitz, L.M., Cole, D.R., Characterization and analysis of porosity and pore structures, Reviews in Mineralogy and Geochemistry, Vol. 80, pp. 61-164, (2005).
How to Cite
Cosmulescu, F., Axinte, S., Paunescu, L., & Dragoescu, M. (2021). USING A SODIUM SILICATE SOLUTION TO PRODUCE IN MICROWAVE FIELD A HIGH-STRENGTH POROUS GLASS FOAM. Nonconventional Technologies Review, 25(1). Retrieved from

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