Virtually immune to chemical attack, only attacked by some fluorine containing compounds at high temperature and… Pyrex has its origins in the early 1910s, when American glass company Corning Glass Works began looking for new products to feature its borosilicate glass… Gert Wrigge & Ilja Gerhardt. A watch glass is just a round piece of glass that is slightly concave/convex (think of a lens). Used to hold solids while they are being weighed or to cover a beaker. When used as a beaker cover, a watch glass prevents the ingress of contaminants while allowing gas exchanges to occur. A watch glass is a circular, slightly convex-concave piece of glass used in chemistry as a surface to evaporate a liquid, to hold solids while being weighed, or as a cover for a beaker. Concave shape prevents sliding and return of condensation to the beaker. SpectrumChemical.com carries a full line of Lab Glassware. Watch glasses are concave dishes that have a variety of uses. They can serve as lids for flasks and beakers. Spectrum Chemical has a complete line of laboratory supplies, equipment and safety items. It can also be employed for weighing solids and as a lid for flasks and beakers. From $393.65. It can hold a small amount of liquid or solid. Discover Chemistry. From $587.00. ... Watch Glass. A watch glass is a circular, slightly concave piece of glass used in chemistry as a surface to evaporate a liquid, or as a cover for a beaker. From $474.35. CG-9800-02 19/22 ORGANIC CHEMISTRY LABSET KITS, 19/22. Collaborate with scientists in your field of chemistry and stay current in your area of specialization. They are also used to hold solids during weighing. Watch Glass Sizes. View. Diameter 60mm (2.4 in) Diameter 70mm (2.8 in) Diameter 80mm (3.2 in) Diameter 100mm (4 in) … MW-13 MINUM-WARE® KITS, INTERMEDIATE. They can be used for evaporation purposes and also can function as a lid for a beaker. MW-11 MINUM-WARE® KITS, DELUXE. 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