EUROPEAN JOURNAL OF MATERIALS SCIENCE AND ENGINEERING Volume 6, Issue 3, 2021: 142-147 | www.ejmse.ro | ISSN: 2537-4338 DOI: 10.36868/ejmse.2021.06.03.142 *Corresponding author: cornelmun@gmail.com; dan.eliezer@gmail.com REVIEW OF PROPERTIES, COMPOSITION AND DEFECTS OF DIFFERENT GLASSES WITH POTENTIAL USE FOR GAS HYDROGEN STORAGE SYSTEMS Andrei RĂȚOI 1 , Corneliu MUNTEANU 1,2* , Bogdan ISTRATE 1 , Dan ELIEZER 3* 1 Faculty of Mechanical Engineering, “Gheorghe Asachi” Technical University of Iasi, Blvd. Prof. Dr. doc. Dimitrie Mangeron 61-63, Iasi 700050, Romania 2 Tech Sci Acad Romania, 26 Dacia Blvd, Bucharest 030167, Romania 3 Ben Gurion Univ Negev, Dept Mat Engn, 1 David Ben Gurion Blvd, IL-8410501 Beer Sheva, Israel Abstract The article reviews the research findings available on different types of glasses that presents potential use for high pressure gas hydrogen storage systems. An overview of the mechanical properties of different glasses, the influence of main constituents and the impact of defects to the strength of glass was presented. As part of this research, it can be concluded that the glass gets a significant improvement of tensile strength by reducing its dimensions to fibre sizes or capillaries due to reduced probability of defects presence. Keywords: glasses, gas hydrogen storage, glass fibre, mechanical properties, composition, defects, review. Introduction Glass is a solid amorphous material that does not present a crystallin structure with a large usage both technological and aesthetical. The oldest type of glass discovered up to now is the silicate glass obtained from a chemical compound of silica, the main constituent of sand [1]. From structural point of view, at atomic scale, glass presents a random grouping of molecules, the most of them being oxygen ions linked together in a framework creating ions of boron, silicon or phosphor [2]. A glass made only from silica presents superior properties, but, unfortunately, due to the high temperatures needed during the production process, it becomes hard to be manufactured and expensive, so, from this reason, different framework modifiers ions as sodium, potassium or calcium are used to improve the process [2]. The article presents an overview of different types of glasses related to the most important mechanical properties that has an influence on the gravimetric and volumetric capacity of the hydrogen storage systems and additionally the impact of the defects to the strength of glass. Glass composition and properties The main glass constituents and their roles are as follows: