Watch glass is commonly used as a cover for beakers. The glass is made of borosilicate, so it can be gently heated in a burner flame to dry precipitates or evaporate solutions. It comes in four sizes.
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Commonly used as covers for beakers, with fire-polished edges to prevent chipping. Flinn only carries watch glasses that are made of borosilicate glass, so these can even be gently heated in a burner flame to dry precipitates or evaporate solutions to dryness. Non-borosilicate watch glasses will shatter when heated and are a potential safety risk.