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 the melting temperature (-5[1])of its main component to around 1600 degrees Celsius. A low coefficient of thermal expansion is characteristic of this material’s “borosilicate” type. Fused (10[1])quartz is one type of this amorphous material composed almost entirely of silicon dioxide. For 10 points, the melting of sand produces (10[1])what material (10[1])sold by Pyrex? ■END■ (10[1])

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