KIMAX KIMBLE KONTES 294000-0500 Dwk Glass Single Neck Round 500ML 14/20 Bottom Boiling Flask

( Brand: Kimax Kimble Kontes ), ( Manufacturer Part Number: 294000-0500 ), ( 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 500ml 14/20 Single Neck Round Bottom Boiling Flask

The **Kimble Kontes 294000-0500 DWK Glass 500 mL 14/20 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 I, Kimble DWK), this flask is designed to withstand extreme thermal and chemical stresses, ensuring durability and reliability in demanding experimental conditions. The **500 mL capacity** provides ample volume for medium-scale reactions, distillation processes, or solvent evaporation, while the **14/20 standard taper joint** ensures a secure, leak-proof connection to compatible glassware such as condensers, adapters, or sidearms, facilitating seamless integration into complex setups. The **single neck design** offers versatility, allowing for straightforward attachment of accessories like reflux condensers, addition funnels, or gas inlet tubes, making it ideal for reflux reactions, heating, or stirring applications.

Constructed with **Kimble Kontes high-quality borosilicate glass**, this flask exhibits exceptional resistance to thermal shock, thermal expansion, and chemical corrosion, even when exposed to strong acids, bases, or organic solvents. The **DWK (Duran ) glass** composition minimizes alkali content, reducing the risk of contamination and ensuring consistent performance across repeated use and sterilization cycles. The **smooth, polished interior surface** promotes efficient mixing and minimizes residue buildup, while the **reinforced neck and base** enhance structural integrity, preventing breakage during handling or agitation. Whether used in academic research, industrial synthesis, or routine laboratory procedures, this flask delivers precision, safety, and longevity, making it a cornerstone of modern chemical experimentation.

Additionally, the **round bottom design** optimizes heat distribution during heating or cooling, reducing hot spots and improving reaction uniformity. Its **clear, transparent glass** allows for real-time visualization of reactions, enabling accurate monitoring of color changes, phase separations, or precipitation. The **standardized dimensions** adhere to international laboratory glassware specifications, ensuring compatibility with most laboratory equipment and protocols. Whether employed in organic synthesis, analytical chemistry, or bioprocessing, this flask combines functionality, durability, and precision, making it an indispensable tool for scientists and researchers demanding excellence in their work.

**Pros and Cons of buying a Kimble Kontes 294000-0500 DWK Glass 500ml 14/20 Single Neck Round Bottom Boiling Flask**

### **Pros**

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 14/20 Joint Compatibility** The 14/20 joint is a widely accepted standard in laboratory glassware, allowing for easy attachment of adapters, condensers, and other glassware components. This compatibility ensures flexibility in experimental setups.

3. **Single Neck Design** The single-neck design simplifies assembly for basic reactions, reflux setups, or simple distillation processes. It reduces the risk of leaks or misalignment compared to multi-neck flasks.

4. **Durability and Longevity** Kimble Kontes is a reputable brand known for producing high-quality, long-lasting glassware. Proper care (avoiding thermal shock and mechanical stress) can extend the lifespan of this flask for years.

5. **Suitable for Moderate-Heat Applications** The 500ml capacity is ideal for small to medium-scale laboratory procedures, and the borosilicate glass can withstand moderate heating (though not extreme temperatures without proper cooling).

6. **Compatibility with Common Lab Equipment** Works seamlessly with standard laboratory equipment like heating mantles, condensers, and stirrers, making it versatile for various chemical processes.

7. **Clean and Sterile Surface** Glass is easier to clean and sterilize than plastic or metal alternatives, reducing contamination risks in sensitive experiments.

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### **Cons**

1. **Fragility Compared to Plastic or Metal** While borosilicate glass is more durable than soda-lime glass, it can still shatter if subjected to sudden temperature changes, mechanical impact, or improper handling. This requires careful use, especially in environments with rough handling.

2. **Limited to Glassware Setups** Unlike plastic or metal alternatives, this flask cannot be used with non-glass-compatible equipment (e.g., some magnetic stirrers or certain seals). It also requires matching glass adapters, which may not always be available.

3. **Higher Cost Than Plastic or Soda-Lime Glass** Borosilicate glassware is more expensive than basic glass alternatives. For non-critical applications, a cheaper flask might suffice, though quality may be compromised.

4. **Maintenance and Cleaning Requirements** Glassware requires thorough cleaning to avoid residue buildup, which can be time-consuming. Some stubborn contaminants may require specialized cleaning agents or ultrasonic baths.

5. **Weight** The glass flask is heavier than plastic alternatives, which can be cumbersome for frequent transfers or large-scale operations. This may not be an issue for most lab settings but could be a consideration in fieldwork or portable applications.

6. **Potential for Microfractures** Over time, glass can develop microscopic cracks that weaken it. While these may not be immediately visible, they can lead to failure under stress. Regular inspection is recommended.

7. **Limited to Low-Pressure Applications** This flask is not designed for high-pressure or vacuum applications without additional reinforcement (e.g., a pressure-rated adapter). For such uses, specialized glassware or metal alternatives would be required.

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### **Conclusion**

The **Kimble Kontes 294000-0500 DWK 500ml 14/20 single-neck round bottom boiling flask** is an excellent choice for laboratories requiring **durability, chemical resistance, and thermal stability** in standard glassware setups. Its borosilicate construction ensures reliability for heating, reflux, and distillation tasks, while the 14/20 joint compatibility enhances its versatility. However, its **higher cost, fragility, and maintenance needs** make it less ideal for budget-conscious or high-impact applications where plastic or metal alternatives might be more practical.

For **general laboratory use, small-scale reactions, or applications requiring glass compatibility**, this flask is a strong recommendation due to its balance of quality and functionality. If the application involves **high pressure, extreme temperatures, or frequent handling risks**, alternative materials (e.g., PTFE-lined flasks or metal reactors) should be considered.

- You need **high-quality, chemically resistant glassware** for standard laboratory procedures.

- Your setup requires **14/20 joint compatibility** with other glass components.

- You prioritize **durability and thermal stability** over cost or weight considerations.

- You are working with **high-pressure or extreme-temperature conditions** without proper reinforcement.

- Budget constraints make plastic or lower-grade glass alternatives more feasible.

- Your workflow involves **frequent rough handling** that could lead to breakage.

Details:

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

part #: 2940000500 price

• $24.99

specifications plasticwarelabsuppy:

• brand: Kimax Kimble Kontes
• mpn: 294000-0500
• 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

general plasticwarelabsuppy:

• Medical, Lab Dental Supplies > Glassware Plasticware > Other Medical Lab Glassware
• condition: Used

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• quantity: 1
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• started: February 7, 2026

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