ʻO nā waiwai o ka borax anhydrous he mau keʻokeʻo keʻokeʻo a i ʻole nā aniani aniani kala ʻole, ʻo ka helu hoʻoheheʻe o ka kristal α orthorhombic he 742.5 ° C, a ʻo 2.28 ka nui;Loaʻa iā ia ka hygroscopicity ikaika, hoʻoheheʻe ʻia i ka wai, glycerin, a hoʻoheheʻe mālie i ka methanol e hana i kahi hopena me kahi ʻano o 13-16%.He alkaline nawaliwali kona ano wai a hiki ole ke hooheheeia i ka waiona.ʻO ka borax anhydrous kahi huahana anhydrous i loaʻa i ka wā i hoʻomehana ʻia ka borax i 350-400 ° C.Ke kau ʻia i ka lewa, hiki iā ia ke komo i ka makū i loko o ka borax decahydrate a i ʻole borax pentahydrate.