Watch Glass

The Laboratory Watch Glass is a durable, multi-purpose glassware essential for covering beakers, evaporating small liquid volumes, weighing samples, and protecting reactions from dust and splashes. Manufactured from premium borosilicate 3.3 for excellent thermal shock and chemical resistance.
Reusable and easy to clean, this watch glass features smooth, polished edges for safe handling and repeat use. Available in popular diameters (45, 50, 70, 80, 90, 100, 120, 150 mm) with a sturdy 2 mm nominal thickness to balance clarity, strength, and heat transfer.
Ideal for chemistry and biology labs, teaching environments, QC benches, and general research workflows.

Glassware item — handle with care; inspect before use. Packaged securely to reduce breakage during shipment.
Borosilicate 3.3 2 mm Thick 45–150 mm Options Reusable & Easy-Clean
Premium material: Borosilicate 3.3 resists chemicals and thermal shock; ideal for heating/evaporation tasks.
Safe, reusable design: 2 mm thickness with polished edges for durability and comfortable handling.
Versatile applications: Evaporation dishes, beaker covers, weighing dishes, crystal observation, and sample drying.
Why this Laboratory Watch Glass?

Durable borosilicate construction — designed to resist common acids, bases, and solvents while withstanding thermal cycling.
Reusable, easy to clean — smooth surface and polished rim support repeated use in busy lab settings.
2 mm thickness — balanced strength and clarity for evaporation and sample handling.
Multiple diameters — choose 45, 50, 70, 80, 90, 100, 120, or 150 mm to match your beakers and procedures.
Versatile utility — beaker cover, weighing dish, crystallization, and as a protective splash shield.
Need help selecting sizes or quantities for your lab set?
Technical Specifications
Attribute
Laboratory Watch Glass
Material
Borosilicate glass (3.3), high chemical & thermal resistance
Thickness
2 mm nominal
Available Diameters
45, 50, 70, 80, 90, 100, 120, 150 mm
Rim / Edge
Polished edge for safe handling
Typical Uses
Beaker cover, evaporation, weighing dish, crystallization, splash protection
Cleaning
Reusable; compatible with standard lab detergents and sterilization protocols
Temperature Guidance
Suitable for gentle heating/cooling; avoid direct flame on glass surface
Compatibility
General chemistry & biology labware and benchtop equipment
General Glassware Academic & Teaching Labs Chemical Sciences Pharmaceutical QC
FAQ

What is a Laboratory Watch Glass used for?

The Laboratory Watch Glass serves as a beaker cover, weighing dish, and shallow evaporation surface. Its borosilicate composition makes the Laboratory Watch Glass suitable for routine heating/cooling and observation of crystallization.
Which sizes of Laboratory Watch Glass are available?

Choose the Laboratory Watch Glass in 45, 50, 70, 80, 90, 100, 120, or 150 mm diameters. Select a size that slightly exceeds your beaker opening for best coverage.
Is the Laboratory Watch Glass reusable and easy to clean?

Yes. The Laboratory Watch Glass features a smooth surface and polished rim for easy cleaning and repeated use with standard lab detergents and sterilization protocols.
How thick is the Laboratory Watch Glass?

The Laboratory Watch Glass is manufactured at approximately 2 mm thickness to balance durability with optical clarity.

Specifications
Material:
Borosilicate
Thickness:
2mm