Description

Laboratory Watch Glass – Borosilicate 3.3, 2 mm Thick | USA Lab

The USA Lab 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 buy from USA Lab

Expert Support
Engineers & technicians on staff.

Quality First
Tested and trusted products.

Fast Fulfillment
Nationwide 1-2 day shipping.

Warranty & Parts
US-based service & spares.

Resources & Downloads

Glassware Best Practices End-Use Certification Ask Technical Support Request a Quote

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.

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Need help selecting sizes or quantities for your lab set?

Call 734-855-4890

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

Popular Industries & Use Cases

General Glassware Academic & Teaching Labs Chemical Sciences Pharmaceutical QC

Business Solutions & Procurement

Programs & Terms

Exclusive options for businesses and academics.

Apply for Net Terms Academic Discount

Documentation & Compliance

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Custom Solutions

Tailored tanks, skids, and integration help.

Custom Request Consulting

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We’ll help spec the right system for your throughput.

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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.

Important Shipping Notice!

DISCLAIMER:

All items are carefully packaged to ensure safe delivery. In the rare event that your item arrives damaged, please notify us within 3 days of receipt. We will promptly provide a replacement or issue a refund.

Please note that any damage occurring after delivery is not covered under warranty. We appreciate your understanding and your trust in our products.