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-50-1118

8ZC-50-1119

8ZC-50-1120

8ZC-50-1121

8ZC-50-1122

8ZC-50-1123

8ZC-50-1127

8ZC-50-1128

8ZC-50-1131

8ZC-50-1132

8ZC-50-1133

8ZC-50-1134