Iimpawu ze-anhydrous borax ziyi-crystals ezimhlophe okanye i-crystals engenambala, indawo yokunyibilika ye-crystal α orthorhombic yi-742.5 ° C, kunye nobuninzi be-2.28;Ine-hygroscopicity enamandla, inyibilika emanzini, i-glycerin, kwaye iyancipha ngokukhawuleza kwi-methanol ukwenza isisombululo kunye ne-concentration ye-13-16%.Isisombululo sayo esinamanzi sinobuthakathaka be-alkaline kwaye asinyibiliki etywaleni.I-anhydrous borax yimveliso engenamanzi efumaneka xa iboraksi ifudunyezwa ukuya kuma-350-400°C.Xa ibekwe emoyeni, inokuthatha umswakama kwi-borax decahydrate okanye i-borax pentahydrate.