Laboratory Watch Glass (100mm) — Apex Labs

The Laboratory Watch Glass 100mm is a fundamental piece of glassware used for evaporation, weighing, and container coverage in professional and educational labs. These circular, slightly concave plates are crafted from high-quality borosilicate glass, offering excellent resistance to chemical corrosion and thermal shock. Their fire-polished edges ensure safe handling, while the high optical clarity allows for precise observation of crystallization or precipitate formation. This bulk pack of 12 is an ideal, cost-effective solution for high-traffic laboratories and science classrooms.

*Image for illustration purposes only.

Technical Specifications

• Brand & Supplier: Apex Labs, Varanasi, UP
• Diameter: 100 mm (approx. 3.94 inches)
• Material: Borosilicate / Neutral Glass
• Quantity: 12 Pieces per Pack
• Thickness: Approx. 2.0 mm
• Edges: Fire-Polished / Ground
• Autoclavable: Yes
• Surface: Polished, High Transparency

Key Features

• High Chemical Resistance: Inert surface resists most acids, alkalis, and solvents, ensuring sample purity.
• Thermal Durability: Capable of withstanding moderate heating and autoclaving processes.
• Fire-Polished Edges: Smooth, rounded rims reduce the risk of chipping and improve user safety.
• Optimal Concavity: Shallow curve is specifically designed to contain liquids during evaporation and solids during weighing.
• Multi-Functional Design: Acts as a loose-fitting lid for beakers to prevent dust contamination while allowing gas exchange.

Primary Applications

• Evaporation: Gently evaporating small volumes of liquid to study crystal growth or residue.
• Beaker Covers: Preventing airborne contamination and splashing while allowing vapors to escape.
• Weighing Surface: Providing a lightweight, stable platform for measuring out powders and crystals.
• Sample Observation: Serving as a clear base for examining specimens under a stereo microscope.
• Drying: Holding small samples for desiccation or drying within a laboratory oven.

Safety & Maintenance

• Thermal Shock: Avoid placing a hot watch glass directly onto a cold surface; allow it to cool gradually.
• Cleaning: Use mild detergents and non-abrasive cloths to maintain optical clarity and prevent scratches.
• Inspection: Always check for cracks or chips before use to prevent breakage during heating.