Quick Answer: The Watch Glass is a shallow concave glass disc with fire-polished edges, made in diameters from 50 mm to 150 mm. It is used for weighing, evaporating small amounts of liquid and covering beakers.
Last updated: October 2026
Key Features
Neutral glass, concave shape that gathers residue in the centre
Fire-polished edges to reduce chipping
Diameters of 50, 60, 75, 100, 125 and 150 mm
Serves as a beaker cover, weighing dish or evaporating surface
Technical Specifications
Specification
Value
Material
Neutral glass
Edges
Fire-polished
Shape
Concave
Diameters
50, 60, 75, 100, 125, 150 mm
About This Product
A solid can be weighed on a watch glass, a few drops of solution can be left on it to evaporate and crystallise, and a larger glass can sit over a beaker as a cover. The concave shape keeps the residue together in the middle where it is easy to collect.
Frequently Asked Questions
What sizes does the Watch Glass come in?
It is made in 50 mm, 60 mm, 75 mm, 100 mm, 125 mm and 150 mm diameters.
.png)
