Watch Glass

What Is a Watch Glass?

A Watch Glass is a shallow, concave laboratory glassware item used in routine sample preparation and general laboratory procedures.

It can provide a practical surface for holding small quantities of solid or liquid samples. It can also support weighing, drying, crystallisation and temporary covering applications.

Liya Test offers four different diameters from 70 mm to 150 mm.

70 to 150 mm Diameter Options

The product range includes Ø70, Ø100, Ø120 and Ø150 mm models.

The smaller 70 mm option is suitable for lower sample quantities and compact working areas.

The 100 and 120 mm models provide intermediate working surfaces for routine laboratory procedures.

For applications requiring a larger surface, the 150 mm Watch Glass provides the widest option in the product group.

Sample Holding and Weighing

Watch Glasses can be used to temporarily hold small quantities of laboratory samples.

The shallow concave form helps keep material within the central area of the glass during handling.

They can also provide a simple surface for weighing suitable solid samples before further preparation or analysis.

Drying and Crystallisation Applications

Watch Glasses may support suitable drying and crystallisation procedures where a shallow exposed surface is useful.

The larger surface area allows a liquid sample to spread into a relatively thin layer.

The exact procedure should always follow the applicable laboratory method and working conditions.

Temporary Beaker Cover

A Watch Glass can also be placed over a suitably sized beaker as a temporary cover.

This helps protect the contents from direct contamination while still providing a simple removable covering solution.

The correct Watch Glass diameter should be selected according to the beaker opening.

Choosing the Correct Size

Model selection depends mainly on the sample quantity and required working surface.

Smaller models are practical for limited sample quantities. Larger diameters provide more surface area for drying, holding or covering applications.

The laboratory should therefore consider both the sample volume and the vessel dimensions before selecting a model.

Material Information

The current product information identifies the product as laboratory glassware but does not specify:

• glass composition
• borosilicate classification
• thickness
• thermal resistance
• edge finish
• maximum operating temperature

Therefore, these technical properties should not be added unless confirmed by the manufacturer.

Liya Test Watch Glass Range

The available models are:

LT-G0455 – Ø70 mm
LT-G0456 – Ø100 mm
LT-G0457 – Ø120 mm
LT-G0458 – Ø150 mm

Overall, the Watch Glass range provides a simple and practical solution for sample holding, weighing, drying, crystallisation and temporary vessel covering. The 70–150 mm diameter options allow laboratories to select an appropriate size for different routine applications.