KIMAX KIMBLE KONTES 25277-250 Dwk Glass Tooled Top Round 500ML 1-NECK Bottom Boiling Flask 25200-500

( Brand: Kimax Kimble Kontes ), ( Manufacturer Part Number: 25277-250 ), ( 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 500ml Tooled Top Round Bottom Boiling Flask

The **Kimble Kontes 25277-250 DWK Glass 500 mL 1-Neck Tooled Top Round Bottom Boiling Flask** is a precision-engineered laboratory glassware essential for a wide range of chemical, biological, and pharmaceutical applications. Crafted from high-quality borosilicate glass (Type 1, conforming to ASTM E438 and USP Class A standards), this flask is designed to withstand extreme thermal shock, ensuring stability during heating, cooling, and agitation processes. The durable **DWK (DW-Kontes) tooled top** features a smooth, ground joint that provides an airtight seal when paired with compatible glassware, such as condensers, adapters, or reaction vessels, minimizing contamination risks and maximizing efficiency in reflux, distillation, or solvent recovery operations. The **round bottom design** optimizes heat distribution, reducing hot spots and promoting uniform temperature control, which is critical for sensitive reactions requiring precise temperature regulation. With a **500 mL capacity**, this flask strikes an ideal balance between versatility and space efficiency, making it suitable for small-scale synthesis, sample preparation, and routine laboratory procedures. The **single-neck configuration** simplifies setup, allowing for straightforward attachment of accessories like stirrers, thermometers, or gas inlet tubes, while the reinforced base ensures stability during vigorous mixing or heating. Whether used in academic research, industrial synthesis, or quality control testing, this flask s **chemical resistance, thermal endurance, and leak-proof design** make it a reliable workhorse for demanding laboratory environments. Its compatibility with standard laboratory glassware and accessories further enhances its utility, ensuring seamless integration into existing workflows. Built to last, the Kimble Kontes 25277-250 is a testament to quality craftsmanship, offering both performance and durability for years of dependable service.

### **Pros and Cons of buying a Kimble Kontes 25277-250 DWK Glass 500 mL 1-Neck Tooled Top Round Bottom Boiling Flask (25200-500)**

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. **Tooled Top Design** The tooled top (ground glass joint) provides a secure, airtight seal when connected to other glassware (e.g., condensers, adapters, or stoppers). This reduces the risk of leaks during reactions, especially under vacuum or pressure.

3. **Standard 25/29 or 24/29 Joint Compatibility** The flask s neck size (likely **24/29** based on the part number) ensures compatibility with most laboratory glassware, making it versatile for setups requiring multiple components (e.g., reflux systems, distillation columns).

4. **Round Bottom Shape** The round bottom design allows for even heating when placed on a hot plate or mantle, reducing hot spots and improving reaction efficiency. This is particularly useful in organic synthesis, reflux reactions, and distillation processes.

5. **Durability and Longevity** Kimble Kontes is a reputable brand known for producing high-quality laboratory glassware that can withstand repeated use, autoclaving (if compatible), and harsh chemical exposure.

6. **Smooth and Clean Finish** The polished glass surface minimizes residue buildup, making cleaning easier and reducing contamination risks in sensitive experiments.

- Reflux reactions

- Distillation

- Heating under reflux

- Solvent evaporation

- Small-scale synthesis

8. **Compatibility with Standard Lab Equipment** Works seamlessly with condensers, adapters, and other glassware from the same manufacturer or third-party suppliers.

---

1. **Fragility Despite Durability** While borosilicate glass is more resistant to thermal shock than soda-lime glass, it is still brittle. Dropping or mishandling can still cause cracks or breakage, especially if the flask is thin-walled.

2. **Limited Volume for Large-Scale Reactions** At **500 mL**, this flask is best suited for small to medium-scale laboratory work. For larger batches (e.g., pilot-scale or industrial processes), a higher-capacity flask would be more appropriate.

3. **Ground Glass Joint Maintenance** The tooled top requires periodic lubrication (e.g., with high-vacuum grease or silicone grease) to maintain a proper seal. Over time, the joint may wear out or become difficult to clean, potentially leading to leaks.

4. **Cost Compared to Plastic or Alternative Materials** Borosilicate glass flasks are more expensive than plastic (e.g., polypropylene) alternatives, which may be sufficient for non-reactive or low-temperature applications. However, glass offers superior chemical resistance and thermal stability.

5. **Potential for Contamination from Grease** If using ground glass joints, residual grease from sealing can sometimes contaminate reactions, especially in highly sensitive or analytical applications.

6. **Not Autoclavable Without Caution** While borosilicate glass can withstand autoclaving, rapid temperature changes may stress the joint or cause thermal shock if not done gradually. Some manufacturers recommend avoiding autoclaving with ground glass joints.

7. **Limited to Glassware Compatibility** If your lab uses primarily plastic or metal components (e.g., Teflon-lined flasks), this glass flask may not integrate well without additional adapters.

8. **Storage and Handling Challenges** Ground glass joints can be delicate and may require careful storage to prevent damage (e.g., storing with protective caps or in a dedicated rack).

---

### **Conclusion**

The **Kimble Kontes 25277-250 DWK 500 mL round bottom boiling flask** is an excellent choice for laboratories requiring **durable, chemically resistant, and thermally stable glassware** for small to medium-scale reactions. Its **tooled top design, borosilicate construction, and compatibility with standard lab setups** make it a versatile tool for organic synthesis, reflux, and distillation. However, its **fragility, maintenance requirements (e.g., joint lubrication), and higher cost** compared to plastic alternatives may be drawbacks depending on the specific application.

- **Academic and research laboratories** where precision and durability are critical.

- **Organic chemistry labs** performing reflux, distillation, or heating under reflux.

- **Applications requiring airtight seals** (e.g., vacuum or pressure-sensitive reactions).

If your workflow involves **large-scale reactions, non-reactive solvents, or frequent autoclaving**, you may need to consider alternatives like **polypropylene flasks or thicker-walled glassware**. Additionally, if ground glass joints are a recurring pain point, **PTFE-lined or screw-cap flasks** could be worth evaluating.

### **Recommendation**

- You need a **reliable, high-quality glass flask** for standard laboratory procedures.

- Your work involves **heating, refluxing, or distillation** where thermal stability is essential.

- You require **compatibility with ground glass joints** for custom setups.

- You prioritize **chemical resistance and longevity** over cost savings.

- You frequently work with **large volumes** (>1 L) and need a higher-capacity flask.

- Your reactions are **low-temperature or non-reactive**, making plastic flasks a more economical choice.

- You dislike maintaining **ground glass joints** and prefer **screw-cap or PTFE-lined flasks**.

- Your budget is constrained, and you can find a **similar plastic or lower-grade glass flask** that meets your needs.

For most **general-purpose organic chemistry labs**, this flask is a **solid investment** that will serve well for years with proper care. Always ensure it is stored safely and cleaned thoroughly after use to maximize its lifespan.

Details:

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

part #: 25277250 prices

• $19.99-$21.99

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• brand: Kimax Kimble Kontes
• mpn: 25277-250
• 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

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