KIMAX KIMBLE KONTES 25285-200 Dwk Glass Single Neck Round 200ML 24/40 Bottom Boiling Flask

( Brand: Kimax Kimble Kontes ), ( Manufacturer Part Number: 25285-200 ), ( 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 KIMAX KIMBLE KONTES Dwk Glass 200ml 24/40 Single Neck Round Bottom Boiling Flask

The **Kimble-Kontes 25285-200 DWK Glass 200 mL 24/40 Single Neck Round Bottom Boiling Flask** is a precision-engineered laboratory glassware essential for a wide range of chemical, biological, and pharmaceutical applications. Crafted from borosilicate glass (Type 1, conforming to ASTM E438 and USP Class A standards), this flask is designed to withstand extreme thermal and chemical stresses, ensuring durability and reliability in demanding experimental conditions. The **200 mL capacity** provides an ideal balance between volume efficiency and ease of handling, making it suitable for reactions requiring moderate heating, distillation, or reflux processes. Its **single neck, 24/40 standard taper joint** facilitates seamless compatibility with a variety of laboratory accessories, including condensers, adapters, and ground-glass stoppers, allowing for versatile setup configurations without the need for additional adapters. The **double-walled (DWK) design** enhances thermal insulation, reducing heat loss during heating operations and promoting more uniform temperature distribution, which is particularly advantageous for reactions sensitive to temperature fluctuations. The **round bottom shape** optimizes heat transfer and minimizes dead space, improving reaction efficiency and yield while reducing the risk of product degradation. Additionally, the flask s smooth, polished surface minimizes residue buildup and simplifies cleaning, adhering to the highest standards of laboratory hygiene. Whether used in routine synthesis, educational demonstrations, or advanced research, this flask exemplifies the precision and quality expected from Kimble-Kontes, a trusted name in laboratory glassware known for its uncompromising standards and long-term performance.

### **Pros and Cons of buying a Kimble-Kontes 25285-200 DWK Glass 200 mL 24/40 Single Neck Round Bottom Boiling Flask**

1. **High-Quality Borosilicate Glass (Type 1 or 3.3)** This flask is made from durable borosilicate glass, which is chemically resistant, thermally stable, and less prone to thermal shock compared to soda-lime glass. This makes it suitable for a wide range of laboratory applications, including heating, refluxing, and distillation.

2. **Standard 24/40 Joint Compatibility** The 24/40 joint is a widely accepted laboratory standard, meaning it can be easily connected to other glassware (e.g., condensers, adapters, and other flasks) without the need for additional adapters. This enhances versatility in experimental setups.

3. **Single Neck Design** The single neck simplifies connections, making it ideal for basic reactions, heating, or reflux setups where only one inlet is required. It is less complex than multi-neck flasks, reducing potential leak points.

4. **Durable and Long-Lasting** Kimble-Kontes is a reputable brand known for producing high-quality laboratory glassware. This flask is designed to withstand repeated use, autoclaving (if compatible with the specific model), and harsh chemical environments.

5. **Cost-Effective for Basic Applications** Compared to more specialized or high-end flasks, this 200 mL round bottom flask offers good value for general laboratory use, such as synthesis, extraction, or small-scale reactions.

6. **Easy to Clean and Sterilize** The smooth glass surface and lack of internal ridges make it straightforward to clean with solvents, detergents, or autoclaving (if the manufacturer allows it). This is crucial for maintaining sterility in biological or chemical experiments.

7. **Compatibility with Common Lab Equipment** It can be used with standard laboratory apparatus like heating mantles, oil baths, magnetic stirrers (with a stir bar), and reflux condensers, making it a versatile tool for many procedures.

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1. **Limited Volume (200 mL)** This flask is relatively small, which may restrict its use for large-scale reactions or experiments requiring significant volumes. Larger flasks (e.g., 500 mL, 1 L) may be more appropriate for bigger projects.

2. **No Ground Glass Stopper Included** The flask does not come with a ground glass stopper, which could be useful for sealing the neck when not in use. This may require purchasing separately if needed.

3. **Potential for Thermal Shock if Mismanaged** While borosilicate glass is more resistant to thermal shock than soda-lime glass, sudden temperature changes (e.g., placing a cold flask in a hot bath) can still cause cracking. Proper handling is necessary.

4. **Not Ideal for High-Pressure Applications** This flask is not designed for high-pressure reactions (e.g., those requiring pressure vessels or heavy-duty seals). For such applications, specialized equipment (e.g., Parr reactors or heavy-walled flasks) is required.

5. **Manual Cleaning Required** Unlike some disposable or single-use glassware, this flask must be cleaned manually after each use, which can be time-consuming, especially if residues are stubborn.

6. **Potential for Scratches or Damage Over Time** Frequent use, especially with abrasive cleaning tools or harsh chemicals, can lead to scratches or weakening of the glass over time. This may eventually reduce its lifespan.

7. **Limited Customization** Unlike some flasks with multiple necks or specialized features, this single-neck flask offers no additional ports or modifications, which may limit its use in complex setups.

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The **Kimble-Kontes 25285-200 DWK 200 mL 24/40 single neck round bottom boiling flask** is a reliable, high-quality choice for general laboratory use, particularly for small-scale heating, refluxing, or synthesis applications. Its borosilicate construction, standard joint compatibility, and durability make it a practical investment for many experiments. However, its small volume and lack of additional features (e.g., a stopper or multiple necks) may limit its suitability for larger-scale or highly specialized work.

- Undergraduate or basic research laboratories.

- Small-scale organic synthesis, extractions, or reactions.

- Applications where a single inlet and standard joint compatibility are sufficient.

If you require larger volumes, multi-neck setups, or high-pressure capabilities, you may need to consider alternative options.

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- You need a durable, chemically resistant flask for routine laboratory work.

- Your experiments require a single-neck setup with a standard 24/40 joint.

- You are working with volumes up to 200 mL and do not need additional ports or features.

- You require larger volumes (e.g., 500 mL or 1 L).

- Your work involves high-pressure reactions or complex multi-neck setups.

- You frequently handle very aggressive chemicals that may require specialized glassware (e.g., PTFE-lined or heavy-walled flasks).

Overall, this is a solid, cost-effective choice for many standard laboratory applications. Always ensure proper handling to maximize its lifespan.

Details:

No chips or cracks throughout, may show minor signs of use with residue. GSR veers 1730 GS 9.9.4 1730 Used item in good condition. See pictures for details.

part #: 25285200 prices

• $19.99-$21.99

specifications plasticwarelabsuppy:

• brand: Kimax Kimble Kontes
• mpn: 25285-200
• 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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• started: February 6, 2026
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• quantity: 1

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• condition: Used

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