The shape, purpose and usage of watch glass

【Modeling】Arc glass plate with smooth edges and chamfered corners.
【How to use】How to use] Wash and dry the watch glass before use. Watch glass has a wide range of uses, but no matter what instrument is used to replace it, it must be used according to the use method of various instruments. For example, for gas cell identification, use a milled syngas cell to connect two watch glasses, place a reagent-impregnated test strip on the upper watch glass, and place the compound to be identified on the lower piece. On the watch glass, heat if necessary, observe the gas produced in the reaction, and identify the gas from the color change of the reagent. If white precipitation or turbidity is observed, a black paper can be pasted on the bottom wall of the watch glass, and the white product can be clearly seen. If making a variety of gauge covers, just place it on the gauge port with its arc and hold it steady, but be careful to choose the watch glass according to the diameter of the gauge. Generally, the diameter of the watch glass should be 1cm larger than the diameter of the instrument, which is more convenient to use. For the beaker lid, use different diameter watch glasses depending on the beaker capacity.
【Use】Made of hard glass, suitable for laboratory quantitative analysis. For example, in biochemical assays, two viewing discs are used to synthesize a culture chamber for suspension droplet culture experiments. Observe the reaction in the gas chamber, and observe white precipitation, trace dissolution, evaporation, etc.
Watch glass can be used as a cover for beakers, evaporating dishes, crystallizing dishes, funnels, etc., to prevent dust from falling in and to keep materials pure during operation. In the sublimation operation, it is used to prevent the dissimilation of the material, so that the dissimilated material remains at the bottom of the watch glass. When weighing corrosive substances, it can be used instead of the balance pan.

Post time: Jun-17-2022