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...ndustry term for cullet glass, often bottles, made into fiber. AR-glass is alkali resistant glass. Most glass fibers have limited solubility in water but it

...was not very resistant to alkali. A new type, E-glass was formed that is alkali free (< 2%) and an alumino-borosilicate glass (Volf, 338). This was the fi

...[[amphoteric]], being both a very weak acid, and forming aluminates with [[alkali]]s. It exists in various crystalline forms.