Corning Pyrex 150mm Watch Glass #9985-150 Heavy Duty Reusable Cover

Description

Product Overview

The Corning Pyrex 150mm watch glass #9985-150 is engineered from high‑quality borosilicate glass, a material renowned for its exceptional thermal resistance and chemical stability. This watch glass features a heavy‑duty rim that adds structural strength, allowing it to withstand repeated handling, cleaning, and autoclaving without cracking or warping. Its clear, optically pure surface provides unobstructed visibility of reactions, enabling precise monitoring of color changes, precipitate formation, and temperature fluctuations during laboratory procedures. The 150mm diameter offers ample coverage for standard beakers, flasks, and shallow dishes, reducing the risk of contamination and evaporation while maintaining a secure seal. Reusability is a core attribute; the glass can be cleaned with standard laboratory detergents and sterilized, delivering long‑term cost savings compared to disposable alternatives. The product complies with industry standards for laboratory glassware, ensuring compatibility with a wide range of chemicals, solvents, and experimental conditions. Detailed specifications include a package dimension of 8.15 x 6.42 x 4.61 inches and a weight of 8.4 ounces, making it lightweight yet robust for everyday laboratory use.

The manufacturing process employs precision molding and annealing techniques that eliminate internal stresses, guaranteeing uniform thickness and optical clarity across the entire surface. Each watch glass is inspected for micro‑fractures using high‑resolution imaging, and only units that meet strict tolerance criteria are released for distribution. This meticulous quality control ensures that the glass maintains its structural integrity even under demanding laboratory conditions, such as rapid temperature shifts or exposure to aggressive solvents.

In addition to its physical robustness, the glass is chemically inert, resisting attack from acids, bases, and organic solvents commonly used in analytical chemistry. This inertness prevents leaching of glass components into samples, preserving the purity of experimental results. The product also complies with ISO 9001 quality management standards and is compatible with standard laboratory equipment, including magnetic stir bars, heating blocks, and vacuum filtration setups.

Safety considerations are integral to the design; the glass’s smooth edges reduce the risk of cuts during handling, and its thickness provides resistance to breakage under accidental impact. Users are advised to wear appropriate protective equipment, such as lab goggles and gloves, when manipulating the glass, especially when working with hot or hazardous substances. The product’s labeling includes clear handling instructions and compliance symbols to promote safe laboratory practices.

Usage

Designed for versatility, this watch glass serves as an ideal cover for beakers, petri dishes, and shallow reaction vessels in chemistry, biology, and environmental testing labs. Its heavy‑duty rim provides a tight fit that minimizes exposure to ambient air, which is especially valuable when working with volatile solvents, moisture‑sensitive reagents, or temperature‑sensitive reactions. Researchers can employ the glass during heating, cooling, or stirring processes, as the borosilicate composition tolerates rapid temperature changes without compromising integrity. The reusable nature of the product makes it suitable for routine daily workflows, from sample preparation to long‑term incubation. Additionally, the clear glass allows for real‑time observation of crystallization, precipitation, or microbial growth without the need to remove the cover, thereby preserving sterility and reducing the chance of contamination. Whether used in academic research, industrial quality control, or teaching laboratories, the watch glass delivers reliable performance across a broad spectrum of experimental scenarios.

When conducting reflux or distillation procedures, the watch glass can serve as a temporary cover to minimize solvent loss while allowing vapor to escape through a controlled opening. Its rim can be gently pressed to create a semi‑tight seal, reducing the need for additional clamps or adapters. For microbiology applications, the clear surface facilitates observation of colony morphology and growth patterns without disturbing the culture environment.

The watch glass is also suitable for educational settings, where students perform simple titrations, precipitation reactions, or qualitative analysis experiments. Its durability withstands the frequent handling typical of classroom labs, and the reusable nature aligns with institutional sustainability goals. In industrial quality‑control labs, the glass provides a reliable barrier for sample containment during stability testing, ensuring consistent exposure conditions across multiple test runs.

The watch glass performs reliably across a temperature range of –196 °C to 300 °C, making it suitable for cryogenic applications as well as high‑temperature synthesis. Its low thermal expansion coefficient minimizes distortion during heating, ensuring that the rim maintains its shape and continues to provide an effective seal. This thermal stability is particularly advantageous for experiments that involve rapid heating or cooling cycles, such as quenching reactions or thermal analysis.

Why Choose Us

Choosing the Corning Pyrex watch glass means selecting a product backed by decades of glassware expertise and a commitment to quality assurance. Each unit undergoes rigorous inspection for dimensional accuracy, surface clarity, and rim uniformity, ensuring that every customer receives a glass that meets exacting laboratory standards. The manufacturer, Karter Scientific, provides comprehensive warranty support and responsive customer service, addressing any concerns promptly and offering guidance on optimal cleaning and maintenance practices.

Our commitment to sustainability extends beyond product design; we partner with recycling programs that accept used laboratory glassware for safe disposal or repurposing. By selecting a reusable watch glass, laboratories reduce their environmental footprint and comply with increasingly stringent waste‑management regulations. The product’s long lifespan translates into fewer shipments, decreasing carbon emissions associated with transportation.

We also provide detailed technical documentation, including material safety data sheets (MSDS), cleaning protocols, and compatibility charts, empowering users to integrate the watch glass seamlessly into existing workflows. Our technical support team is available to answer formulation questions, advise on optimal usage conditions, and troubleshoot any performance issues, ensuring that the glass delivers consistent results throughout its service life.

Our quality certifications include compliance with ASTM E415 for laboratory glassware and CE marking for conformity with European safety standards. These certifications affirm that the watch glass meets rigorous performance criteria and can be confidently used in regulated environments, including pharmaceutical manufacturing and clinical diagnostics. By adhering to these standards, we guarantee that the product delivers consistent, repeatable results essential for high‑stakes research and production.

The product’s proven track record—reflected in a 4.8‑star rating from verified users—demonstrates consistent satisfaction among professionals who rely on its durability and performance. By investing in this watch glass, laboratories benefit from reduced consumable costs, enhanced experimental reliability, and the peace of mind that comes from using a trusted, industry‑approved glassware solution.

Key Features

• Heavy‑duty rim delivers a secure seal that prevents evaporation and contamination during critical experiments.
• Reusable borosilicate construction withstands repeated autoclave cycles, offering long‑term cost efficiency.
• 150mm diameter provides broad coverage for standard beakers and shallow dishes, enhancing versatility.
• Crystal‑clear glass enables unobstructed visual monitoring of reactions, supporting precise data collection.
• Backed by dedicated customer support and warranty service, ensuring confidence and assistance when needed.

FAQ

Can this watch glass be autoclaved?

Yes, the Corning Pyrex watch glass is made from borosilicate glass, which tolerates standard autoclave temperatures (up to 121 °C) and pressure cycles without cracking, allowing for thorough sterilization between uses.

What size beakers is this watch glass compatible with?

The 150mm diameter is suitable for most laboratory beakers ranging from 100 mm to 200 mm in diameter, as well as shallow flasks and petri dishes, providing a flexible fit for a variety of vessel sizes.

How should I clean and maintain the watch glass?

After each use, rinse the glass with distilled water, then wash with a mild laboratory detergent. For stubborn residues, soak in a solution of 10 % nitric acid followed by thorough rinsing. Autoclave for final sterilization if required.

Is the heavy‑duty rim prone to scratching?

The rim is engineered to resist scratches and deformation under normal laboratory handling. Minor surface marks may occur with abrasive cleaning tools, so it is recommended to use non‑abrasive sponges or brushes.

What warranty does the product include?

The watch glass comes with a manufacturer warranty covering defects in material and workmanship. For detailed warranty terms, please refer to the product warranty link provided on the listing page.