CHEMGLASS CG-1554-04 Single Neck Pear Wall Flask 250ML 24/40

( Brand: Chemglass ), ( Manufacturer Part Number: CG-1554-04 ), ( Part Type: Wall ), ( Intended Use/discipline: Biological Laboratory, Dental Laboratory, Medical Laboratory, Microbiological Laboratory, Physical Laboratory ), ( Country Of Origin: United States ), ( Unit Type: Unit ), ( Additional Information: Surplus Laboratory Consumable Supplies )

Review CHEMGLASS 250ml 24/40 Single Neck Pear Shaped Heavy Wall Flask

The **Chemglass CG-1554-04 250 mL 24/40 Single Neck Pear-Shaped Wall Flask** is a precision-engineered laboratory glassware essential for a wide range of chemical, pharmaceutical, and analytical applications. Crafted from borosilicate glass (Type I, conforming to ASTM E438 and USP Class A standards), this flask combines exceptional thermal resistance with chemical inertness, ensuring reliability in demanding experiments involving heating, cooling, or solvent reactions. Its distinctive pear-shaped design, characterized by a smooth, tapered body and a single standard taper 24/40 joint, optimizes mixing efficiency while minimizing dead space, making it ideal for distillation, reflux, or titration procedures. The 250 mL capacity provides ample volume for medium-scale syntheses, allowing for precise measurements and controlled reactions without excessive material loss. The wall-flask configuration featuring a thickened, reinforced base enhances stability during heating or agitation, reducing the risk of breakage on hot plates or magnetic stirrers. The 24/40 joint ensures compatibility with a variety of adapters, condensers, or stoppers, facilitating seamless integration into complex setups. Whether used in academic research, industrial synthesis, or quality control testing, this flask delivers durability, clarity, and functionality, making it a cornerstone of modern laboratory workflows. Its smooth, polished surface promotes easy cleaning and sterilization, while the borosilicate composition resists thermal shock, ensuring longevity even under repeated thermal cycling. For laboratories prioritizing precision and performance, the CG-1554-04 is an indispensable tool for experiments requiring both versatility and reliability.

### **Pros and Cons of buying a Chemglass CG-1554-04 (250 mL, 24/40 Single Neck Pear-Shaped Flask)**

1. **Durability and Quality Construction** Chemglass is a well-established manufacturer known for producing high-quality glassware designed for laboratory use. This flask is likely made from borosilicate glass (e.g., Type I or Type II), which is resistant to thermal shock and chemical corrosion, making it suitable for a wide range of applications, including heating, refluxing, and distillation.

2. **Standardized Joint Compatibility** The 24/40 joint is a universal standard in laboratory glassware, allowing it to be easily connected to adapters, condensers, funnels, and other glassware components without the need for custom fittings. This versatility makes it a practical choice for general laboratory work.

3. **Pear-Shaped Design** The pear shape provides a larger surface area for heating (if placed in an oil bath or heated directly) compared to a round-bottom flask of the same volume. This can improve heat transfer efficiency in certain reactions, such as reflux setups.

4. **Cost-Effective for Basic Needs** For many laboratory tasks (e.g., titrations, simple reactions, or storage), a 250 mL pear flask is a reasonable volume. It strikes a balance between being too small (e.g., 100 mL) and unnecessarily large (e.g., 500 mL or 1 L), making it a practical choice for small-scale experiments.

5. **Compatibility with Common Lab Equipment** The flask can be used with standard laboratory accessories like clamps, heating mantles, condensers, and dropping funnels, making it adaptable to various setups without requiring specialized equipment.

6. **Transparency and Visibility** The clear glass allows for easy monitoring of reactions, color changes, or the presence of precipitates, which is useful for qualitative observations.

7. **Long Lifespan with Proper Care** If handled carefully (avoiding sudden temperature changes, mechanical stress, or exposure to highly abrasive chemicals), this flask can last for years, making it a durable investment for educational or small-scale research settings.

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1. **Limited Volume for Scaling Up** At 250 mL, this flask is only suitable for small-scale reactions. If you frequently work with larger quantities (e.g., multi-gram syntheses or pilot-scale experiments), you may need additional flasks (e.g., 500 mL, 1 L, or 2 L) or alternative vessels like round-bottom flasks, which are often preferred for heating and stirring.

2. **Potential for Uneven Heating** While the pear shape improves heat distribution compared to a round-bottom flask, it may still not be as efficient as a round-bottom flask when heated directly (e.g., in an oil bath or on a hot plate). Round-bottom flasks are generally better suited for heating under reflux or distillation due to their symmetrical shape.

3. **Less Ideal for Stirring** Pear-shaped flasks are not designed with stirring in mind. If you need to stir the contents (e.g., with a magnetic stir bar), you may encounter issues with the stir bar getting stuck or the flask not being compatible with certain stirrer setups. Round-bottom flasks are typically better for stirring applications.

4. **Limited Availability of Accessories** While the 24/40 joint is standard, some specialized adapters or connectors may not be as readily available for pear-shaped flasks compared to round-bottom flasks, which have a more uniform design.

5. **Potential for Breakage** Like all glassware, pear-shaped flasks are fragile and can break if dropped, subjected to thermal shock (e.g., adding cold liquid to hot glass), or exposed to sudden pressure changes (e.g., vigorous boiling without a condenser). Proper handling is essential to avoid accidents.

6. **Less Common in Advanced Setups** In professional or industrial laboratories, round-bottom flasks are often preferred for their efficiency in heating, stirring, and vacuum applications. Pear-shaped flasks are more commonly used in educational settings or for specific tasks where their shape is advantageous.

7. **Potential for Residue Buildup** The narrow neck and curved shape can make cleaning more difficult, especially if the flask is used for reactions that produce sticky or viscous residues. Thorough cleaning may require additional tools like brushes or ultrasonic cleaners.

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The Chemglass CG-1554-04 (250 mL, 24/40 single neck pear-shaped flask) is a **practical and durable choice for small-scale laboratory tasks**, particularly in educational settings, basic chemical synthesis, or applications where the pear shape offers advantages (e.g., heating in an oil bath). Its standardized joint and clear glass make it easy to use and versatile for general purposes. However, it may not be the best option for **large-scale reactions, stirring-heated setups, or advanced synthetic chemistry**, where round-bottom flasks are often preferred.

If your primary needs involve **small volumes, heating without stirring, or simple reactions**, this flask is a solid investment. If you require **scalability, efficient stirring, or frequent heating under reflux**, consider supplementing it with round-bottom flasks or other appropriate glassware.

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- You need a reliable, cost-effective flask for small-scale reactions (e.g., titrations, simple syntheses, or storage).

- You frequently use oil baths or need a flask with a larger heating surface than a round-bottom flask.

- You work in an educational setting where pear-shaped flasks are standard (e.g., undergraduate labs).

- You prioritize compatibility with standard 24/40 joint accessories.

- You frequently work with volumes larger than 250 mL (invest in a 500 mL or 1 L round-bottom flask instead).

- You need to stir the contents regularly (opt for a round-bottom flask with a ground glass joint or a flask with a side arm).

- You plan to perform advanced reactions (e.g., reflux, distillation, or vacuum operations) where round-bottom flasks are more efficient.

- You require multiple flasks for different volumes (a set of round-bottom flasks may be more versatile long-term).

For most **general laboratory use**, pairing this pear flask with a round-bottom flask (e.g., 250 mL or 500 mL) would provide the best balance of functionality and flexibility. If budget is a concern, the pear flask alone is a reasonable starting point.

Details:

See pictures for details. GSR veers 1730 GS 9.9.4 1730 , GSR 1730 Used item in great condition. No chips / cracks throughout.

part #: cg155404 prices

• $14.99-$35.99

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• brand: Chemglass
• mpn: Cg-1554-04
• part type: Wall
• intended use/discipline: Biological Laboratory, Dental Laboratory, Medical Laboratory, Microbiological Laboratory, Physical Laboratory
• country of origin: United States
• unit type: Unit
• additional information: Surplus Laboratory Consumable Supplies

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