Cov khoom ntawm anhydrous borax yog dawb crystals los yog tsis muaj kob iav crystals, lub melting point ntawm α orthorhombic siv lead ua yog 742.5 ° C, thiab qhov ceev yog 2.28;Nws muaj zog hygroscopicity, yaj nyob rau hauv dej, glycerin, thiab maj mam yaj nyob rau hauv methanol los ua ib tug tov nrog ib tug concentration ntawm 13-16%.Nws cov tshuaj aqueous yog qaug zog alkaline thiab insoluble hauv cawv.Anhydrous borax yog cov khoom tsis muaj dej uas tau txais thaum borax yog cua sov rau 350-400 ° C.Thaum muab tso rau hauv huab cua, nws tuaj yeem nqus dej noo rau hauv borax decahydrate lossis borax pentahydrate.