A: Watch glass is a circular, concave-shaped glass plate commonly made from borosilicate glass. It has a diameter ranging from 50 to 150 millimeters. Its unique properties include excellent transparency and clarity, high chemical resistance, and thermal stability. The smooth, polished surface of watch glass ensures optimal visibility during.. Not only does it provide the aesthetic appeal a watch needs but it also ensures the protection of the dial and other internal components. Therefore, we have mentioned the 5 most common types of watch glass materials that you should know about: Acrylic crystal watch. Mineral crystal watch. Sapphire crystal watches.
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Borosilicate and quartz glasses are common, and offer high resistance to thermal shock. Proprietary glasses such as KIMAX ® (Kimble Chase), Pyrex ® (Corning) and Zerdour ® (Schott Glass) provide features such as added mechanical strength and chemical resistance. Laboratory buyers should consider all of their application requirements.. As you’ll probably already know, watch glass is that round (or square, whatever shape the face is) piece of clear material that covers the watch dial. It’s there to protect it from impact. It can also be used as a magnifier for a specific component, say the day/date window, for example. If you see one of these very small magnifying sections.