I-Sodium tetraborate (i-Sodium tetraborate, i-borax, i-borax, i-borax, i-E285) ingusawoti we-boric acid obuthakathaka futhi isisekelo esiqinile, isakhi esivamile se-boron, sine-crystal hydrate eziningana. Ifomula lamakhemikhali Na2B4O7.
I-sodium tetraborate isetshenziswa njengengxenye yezinsipho nezimonyo; ezimbonini zephepha nezemithi; ekukhiqizeni ama-enamel, izingilazi, izibuko ezibonakalayo nezimbala; njengesibulala-magciwane nesivimbelo.