KIMAX KIMBLE KONTES 25285-250 Dwk Glass Single Neck Round 250ML 24/40 Bottom Boiling Flask

( Brand: Kimax Kimble Kontes ), ( Manufacturer Part Number: 25285-250 ), ( 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 250ml 24/40 Single Neck Round Bottom Boiling Flask

The **Kimble-Kontes 25285-250 DWK 250 mL 24/40 Single Neck Round Bottom Boiling Flask** is a precision-engineered laboratory glassware essential for a wide range of chemical, biochemical, and analytical applications. Crafted from high-quality borosilicate glass (Type I, Kimble Kimax), this flask is designed to withstand extreme thermal and chemical stresses, ensuring reliability in demanding experimental conditions. Its **250 mL capacity** strikes an ideal balance between versatility and efficiency, making it suitable for small-scale reactions, distillation processes, reflux setups, and even basic synthesis work. The **24/40 standard taper joint** provides a secure, leak-proof connection to compatible glassware, such as condensers, adapters, or additional reaction vessels, while its **single neck design** simplifies assembly and reduces potential points of failure. The **double-walled (DWK) construction** offers enhanced thermal insulation, minimizing heat loss during boiling or heating operations, which not only improves energy efficiency but also reduces the risk of thermal shock to the flask itself. The **round bottom geometry** ensures even heat distribution when placed on a heating mantle or hot plate, promoting uniform boiling and preventing localized hot spots that could compromise reaction outcomes. Additionally, the smooth, polished glass surface resists chemical corrosion and scaling, maintaining clarity and accuracy over countless uses. Whether employed in educational laboratories, pharmaceutical research, or industrial synthesis, this flask exemplifies durability, precision, and adaptability making it a cornerstone of any well-equipped chemistry workspace.

### **Pros and Cons of buying a Kimble-Kontes 25285-250 DWK Glass 250 mL 24/40 Single Neck Round Bottom Boiling Flask**

1. **High-Quality Borosilicate Glass (Type 1)** The 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 universal standard in laboratory glassware, allowing for easy attachment of adapters, condensers, and other glassware components. This flexibility makes it versatile for various setups.

3. **Single Neck Design** The single neck simplifies connections for basic reactions, reflux setups, or simple distillation. It is ideal for experiments that do not require multiple ports.

4. **Durable and Long-Lasting** Kimble-Kontes is a reputable brand known for producing high-quality, long-lasting glassware. Proper care ensures the flask remains functional for years.

5. **Cost-Effective for Basic Use** Compared to more specialized or high-end flasks, this model offers good value for general laboratory applications, especially for students or small-scale research.

6. **Easy to Clean and Sterilize** The smooth glass surface resists staining and can be easily cleaned with standard laboratory detergents or sterilized with autoclaving (if compatible with the setup).

7. **Wide Range of Applications** Suitable for heating, stirring, reflux, and basic distillation, making it a versatile tool for organic synthesis, chemistry experiments, and small-scale production.

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1. **Limited to Single Neck Use** If your experiments require multiple ports (e.g., for adding reagents simultaneously or monitoring multiple parameters), this flask may not be ideal. A multi-neck flask would be more suitable.

2. **Not Ideal for High-Pressure Reactions** While borosilicate glass is strong, it is not designed for high-pressure applications. For reactions requiring pressure, a specialized pressure vessel or heavy-walled flask would be necessary.

3. **Manual Handling Required** Glassware like this must be handled carefully to avoid breakage. It cannot be used in automated systems without additional adapters or supports.

4. **Potential for Contamination** If not cleaned thoroughly, residues from previous experiments can contaminate subsequent reactions. This is a risk with any glassware but requires diligent maintenance.

5. **Limited to Laboratory Use** This flask is not designed for industrial or large-scale production. Its size (250 mL) is best suited for bench-scale or small-scale applications.

6. **Cost Compared to Plastic Alternatives** While durable, borosilicate glass flasks are more expensive than disposable plastic alternatives. For single-use applications, plastic may be more economical, though less reusable.

7. **Thermal Shock Sensitivity (Relative to Heavy-Walled Glass)** While borosilicate is resistant to thermal shock, sudden temperature changes (e.g., placing a cold flask in a hot oil bath) can still risk cracking. Heavy-walled or specialized flasks are better for extreme conditions.

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The **Kimble-Kontes 25285-250 DWK borosilicate glass flask** is an excellent choice for **general laboratory use**, particularly in **organic synthesis, undergraduate teaching labs, or small-scale chemical reactions**. Its **durability, chemical resistance, and standard joint compatibility** make it a reliable workhorse for basic to intermediate applications. However, it is **not ideal for high-pressure, multi-port, or large-scale industrial use**, nor is it necessary if disposable alternatives suffice.

For **students, hobbyists, or researchers needing a versatile, reusable flask for heating, reflux, or simple distillation**, this flask is a **strong recommendation**. If your work requires **multiple ports, high pressure, or extreme conditions**, consider a **multi-neck flask, heavy-walled flask, or alternative materials** (e.g., PTFE-lined or stainless steel).

- You need a **durable, reusable, and chemically resistant** glassware for **basic to intermediate lab work**.

- You require a **single-neck setup** for **heating, reflux, or simple distillation**.

- You value **long-term reliability** and are willing to invest in high-quality glassware.

- You need **multiple ports** (opt for a multi-neck flask instead).

- Your experiments involve **high pressure or extreme temperatures** (consider heavy-walled or specialized flasks).

- You are working on a **tight budget** and disposable alternatives are acceptable.

- You require **industrial-scale or large-volume reactions** (larger or specialized flasks are needed).

Details:

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

part #: 25285250 prices

• $19.49-$22.99

specifications plasticwarelabsuppy:

• brand: Kimax Kimble Kontes
• mpn: 25285-250
• 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:

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

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• method: Money back
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• time: 30 Days

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offer plasticwarelabsuppy:

• sold: 0
• started: February 6, 2026
• options: Ship-to-home
• quantity: 6
• availability: In Stock

seller plasticwarelabsuppy:

• rating: 99.8%
• city: Cotati, California
• # reviews: 7385

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