Round 3: Tossup 17

A thin coating of titanium dioxide on this material makes it superhydrophilic and allows for photocatalytic “self-cleaning.” This material is made to a uniform thickness over a molten tin bath in the Pilkington process, which produces this material’s “float” type. When manufacturing this material, soda and lime are added to lower (10[1])the melting temperature (-5[1])of its main (10[1])component to around 1600 degrees Celsius. A low coefficient of thermal expansion is characteristic of this material’s “borosilicate” type. Fused quartz is one type of this amorphous (10[1])material composed almost entirely of silicon dioxide. For 10 points, the melting of sand produces what material sold by Pyrex? (10[1])■END■

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