EISCO 12PK Watch Glasses, 3.5″ (9cm) – Cover Lids for Beakers & Flasks – Evaporation Dish – Polished with Ground Edges

Description

Product Overview

The EISCO 12‑pack of 3.5″ (9 cm) watch glasses is engineered for precision and durability in demanding laboratory environments. Each cover is fabricated from high‑quality borosilicate glass with a thickness of 2 mm, providing a robust barrier that resists thermal shock and mechanical impact. The polished surface and ground edges minimize the risk of cuts during handling, while the clear, non‑porous material ensures chemical inertness, preventing any interaction with the contents of beakers or flasks. These watch glasses are sized to fit standard 250 ml to 500 ml containers, making them versatile for a wide range of experimental protocols, from simple solution mixing to complex evaporation procedures. The set includes twelve identical pieces, each carefully inspected for uniformity and free of defects, guaranteeing consistent performance across all uses.

Usage

Designed for both educational and professional settings, these watch glasses excel in a variety of applications. In academic science classrooms, they serve as reliable covers for beakers during demonstrations, allowing students to observe reactions while protecting the work surface from spills. In research laboratories, they are indispensable for evaporation of solvents, crystallization experiments, and as temporary lids for small-volume samples awaiting analysis under a low‑powered microscope. Their clear glass construction enables easy visual monitoring of reaction progress without the need to remove the cover, reducing exposure to hazardous vapors. Additionally, the sturdy design makes them suitable for field work, where portability and resilience are essential. Whether used for routine titrations, sample storage, or as a platform for micro‑scale reactions, these watch glasses provide a dependable solution that enhances safety and efficiency.

Why Choose Us

EISCO Laboratories has a long‑standing reputation for manufacturing laboratory glassware that meets stringent quality standards. Each watch glass is produced using state‑of‑the‑art molding equipment, followed by a meticulous polishing process that yields a smooth, scratch‑free surface. The company’s commitment to quality control includes multiple inspection stages, ensuring that every piece meets the required dimensional tolerances and visual clarity. Moreover, EISCO’s environmentally responsible manufacturing practices reduce waste and energy consumption, aligning with sustainable laboratory initiatives. Customers benefit from responsive technical support and a clear warranty policy that addresses any concerns regarding product performance. By choosing EISCO, laboratories gain access to glassware that not only performs reliably but also reflects a dedication to scientific excellence and responsible production.

Key Features

• Sturdy 2 mm thick borosilicate glass resists shattering and thermal shock
• Polished surface and ground edges provide safe, comfortable handling
• Clear, chemically inert material prevents contamination of samples
• Universal 3.5″ (9 cm) diameter fits a wide range of beakers and flasks
• Comprehensive after‑sales support and warranty from EISCO Labs

FAQ

Can these watch glasses be used for high‑temperature applications?

Yes, the borosilicate glass composition is designed to withstand temperatures up to 500 °F (260 °C) without cracking, making them suitable for most heating procedures in the lab.

Are the watch glasses compatible with all types of beakers?

They are optimized for standard cylindrical beakers ranging from 250 ml to 500 ml, but the 3.5″ (9 cm) diameter also accommodates many other container shapes, including small flasks and Erlenmeyer vessels.

What is the recommended cleaning method?

Rinse the glasses with distilled water after use and, if needed, clean with a mild laboratory detergent. Avoid abrasive scrubbers to preserve the polished surface.

Do the watch glasses come with a warranty?

EISCO provides a one‑year limited warranty covering manufacturing defects, ensuring that any faulty pieces are replaced promptly.

How should the watch glasses be stored to maintain their quality?

Store them in a clean, dry cabinet, preferably in a protective container that prevents contact with sharp objects or heavy items that could cause breakage.