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Watch Glass


Watch Glass, 12 Pack

Concave shaped watch glass used as a surface to evaporate a liquid, to hold solids while being weighed, or as a cover for flasks or beakers.

Watch Glass Sizes

Diameter 60mm (2.4 in)

Diameter 70mm (2.8 in)

Diameter 80mm (3.2 in)

Diameter 100mm (4 in)

Free Shipping within the Continental USA

Beaker Technical Data:


SiO2 80.4%
AI2O3 2.4%
B2O3 13.0%
Na2O 4.2%


Physical Properties:

Glass type: Hard Borosilicate Glass Linear.

Coefficient of expansion (20oC - 300oC) 3.3x10-6K
Annealing point 560±10oC
Density, Annealed 2.23g/cm3
Softening point 820±10oC
Hydrolytic resistance Type 1 glass
Acid resistance Type 1 glass
Alkali resistance Type 1 glass


Temperature Resistance:

Thermal resistance is a good gauge to how well the glass handles high heat and yet retains its shape and structural integrity. Factors that should be specially considered are softening temperature and coefficient of heat. Our borosilicate glass has high softening temperatures and low coefficient of heat enabling our glassware to withstand heat and also have a higher range of working temperatures. Special care must still be taken at temperatures above 140oC to heating and cooling to be done in a most uniform manner.

Chemical Resistance:

Borosilicate glass has a very high resistance to attack from water, acids, salt solutions, halogens and organic solvents. Only concentrated phosphoric acid and strong alkaline solution cause significant corrosion of the glass.

Water at 98 ISO 719 HGB1
Water at 121 ISO 720 HGA1
Acid ISO 1776 HGA1
Boiling water solution of alkali ISO 695 HGA2

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