EXPERIMENTAL STUDY OF BORATE-BASED GLASS MEDIUM MATERIAL AND HUTA GINJANG QUARTZ SAND THROUGH MELT-QUENCHING TECHNIQUE. einstein e-j. [Internet]. 2025 Feb. 25 [cited 2026 Mar. 20];13(1):42-8. Available from: https://jurnal.unimed.ac.id/2012/index.php/einsten/article/view/64965