Accurate watch glasses: soda-lime & borosilicate glass-3.3

Watch Glasses made of Soda-Lime Glass

Fused rim
Manufactured according to DIN 12341
Lower thermal shock resistance than borosilicate glass
Maximum working temperature: approx. 120 °C

Watch Glasses made of DURAN® Borosilicate Glass 3.3

Fused rim
Manufactured according to DIN 12341
Temperature resistant
Fireproof

For evaporating liquids, including over a Bunsen burner
For covering beakers or Petri dishes
For weighing small quantities of substances
For drying small quantities of substances in a drying cabinet

The term "watch glass" is derived from early pocket watches, which typically had a domed protective glass. Similarly, watch glasses are slightly curved upwards at the edges, forming a shallow dish. They are suitable for holding small quantities of liquids for evaporation and can also be heated over a Bunsen burner to speed up vaporisation.

Thanks to their curved shape, watch glasses are also used in laboratories to cover beakers or Petri dishes, protecting them from contamination, splashes, or evaporation.

Watch glasses

8ZC-50-1143

8ZC-50-1272

8ZC-50-1273

8ZC-50-1274

8ZC-50-1275