KONTES KIMBLE KIMAX 295550-0500 Glass Angled Round Bottom 500ML 3-NECK 14/20 Flask

( Brand: Kontes Kimble Kimax ), ( Manufacturer Part Number: 295550-0500 ), ( Intended Use/discipline: Biological Laboratory, Dental Laboratory, Medical Laboratory, Microbiological Laboratory, Physical Laboratory ), ( Unit Type: Unit ), ( Country Of Origin: United States ), ( Additional Information: Surplus Laboratory Consumable Supplies )

Review KONTES KIMBLE KIMAX Glass 500ml Angled 14/20 Round Bottom Flask

The **Kontes Kimble Kimax 295550-0500 500 mL Angled 3-Neck Round Bottom Flask** is a precision-engineered laboratory glassware essential for a wide range of chemical, biochemical, and pharmaceutical processes. Crafted from **borosilicate glass (Type 3.3)**, this flask exemplifies durability, chemical resistance, and thermal stability, making it ideal for applications requiring high temperatures, aggressive solvents, or prolonged exposure to corrosive substances. Its **angled design** (approximately 45 degrees) optimizes space in crowded laboratory setups while maintaining efficient mixing and reaction dynamics, reducing dead space and minimizing residue buildup compared to traditional vertical-neck flasks. The **three standard 14/20 joint necks** provide versatile connectivity options, accommodating a variety of adapters, condensers, funnels, or side-arm attachments without compromising functionality. Each neck is meticulously ground to ensure a secure, leak-proof seal when paired with compatible glassware, enhancing the flask s reliability for vacuum or reflux operations.

With a **500 mL capacity**, this flask strikes a balance between practicality and scalability, suitable for medium-sized reactions, distillations, or synthesis procedures where precise volume control is critical. The **round bottom design** promotes uniform heating and even distribution of reactants, reducing the risk of localized overheating or uneven reactions a common issue in flat-bottomed vessels. The **smooth, polished interior surface** minimizes catalytic contamination and simplifies cleaning, while the **reinforced base** ensures stability during agitation or heating, even when mounted on a magnetic stirrer or heated mantle. Whether used in academic research, industrial synthesis, or quality control testing, this flask adheres to stringent manufacturing standards, delivering consistency and performance that laboratory professionals demand. Its compatibility with standard laboratory equipment and adherence to **ASTM E438 and ISO 3585** specifications further solidify its reputation as a dependable workhorse in any analytical or preparative chemistry workflow.

### **Pros and Cons of buying a Kontes Kimble Kimax 295550-0500 (500 mL Angled 3-Neck Round Bottom Flask)**

1. **High-Quality Borosilicate Glass (Type 1)** This flask is made from **Kimble-Kimax borosilicate glass**, which is chemically resistant, durable, and can withstand high temperatures (up to 300 C). It is less prone to thermal shock compared to soda-lime glass, making it suitable for laboratory applications.

2. **Angled Design** The **angled neck** allows for better visibility of the contents and easier attachment of multiple adapters or condensers without obstructing the view. This is particularly useful in reflux setups or when working with multiple side arms.

3. **Three-Necked Configuration** The **three-neck design** provides flexibility for attaching multiple pieces of glassware (e.g., a thermometer, addition funnel, and condenser) simultaneously, making it ideal for **reflux reactions, distillations, and multi-step syntheses**.

4. **Standard 14/20 Joints** The **14/20 ground glass joints** are a common laboratory standard, ensuring compatibility with a wide range of adapters, condensers, and other glassware. This makes it easy to integrate into existing setups.

5. **Durable and Long-Lasting** Kontes (a brand under Kimble Chase) is known for producing **high-quality laboratory glassware** that resists corrosion and maintains structural integrity over prolonged use.

6. **Smooth and Even Heating** The **round bottom** design allows for even heating when placed in an oil bath or heating mantle, reducing hot spots and improving reaction efficiency.

7. **Easy to Clean** The smooth glass surface and lack of crevices make it relatively easy to clean, though proper care (e.g., avoiding abrasive cleaners) is still necessary.

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1. **Expensive Compared to Basic Glassware** Borosilicate glassware is generally more costly than soda-lime glass alternatives. While this flask is a **mid-range investment**, it may be overkill for casual or non-laboratory use.

2. **Fragility Despite Durability** Even though borosilicate glass is more resistant to thermal shock than soda-lime, it is still **glass and can break** if dropped or subjected to sudden temperature changes. Care must be taken during handling and cleaning.

3. **Limited to Laboratory Use** This flask is **not suitable for food, beverage, or general household use** due to potential chemical leaching and lack of FDA/NSF certification. It is strictly for **scientific and industrial applications**.

4. **Requires Proper Storage** The **ground glass joints (14/20)** can degrade over time if not stored properly (e.g., with joint grease or in a dry, dust-free environment). Neglecting storage can lead to sealing issues.

5. **Not Ideal for High-Pressure Applications** While it can handle standard laboratory pressures, it is **not designed for high-pressure reactions** (e.g., autoclave conditions). Specialized flasks (e.g., Parr reactors) are needed for such applications.

6. **Maintenance of Joints** Over time, the **ground glass joints may wear out**, requiring replacement or re-greasing. This adds to the long-term cost of ownership.

7. **Not Suitable for Open-Flame Heating Without Protection** Direct exposure to an open flame (without a heating mantle or oil bath) can cause uneven heating and potential breakage. A **heating mantle or sand bath** is recommended.

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### **Conclusion**

The **Kontes Kimble Kimax 295550-0500 (500 mL angled 3-neck round bottom flask)** is a **high-quality, versatile, and durable** piece of laboratory glassware ideal for **synthetic chemistry, reflux reactions, and multi-neck setups**. Its **borosilicate construction, angled design, and standard joints** make it a reliable choice for serious laboratory work. However, its **higher cost, fragility, and specialized use** mean it is **not necessary for casual or non-laboratory applications**.

### **Recommendation**

- You are a **student, researcher, or chemist** working in a laboratory setting.

- You need a **reliable, multi-neck flask** for **reflux, distillation, or synthesis**.

- You can afford the **premium quality** and proper storage/maintenance.

- You are looking for a **budget-friendly** or **non-laboratory** flask.

- You do not have access to **proper heating methods** (e.g., heating mantle) and will risk thermal shock.

- You require **high-pressure or extreme-temperature applications**.

For most **serious laboratory users**, this flask is a **worthwhile investment** due to its **longevity and performance**. However, if you are on a tight budget or only need occasional use, consider **cheaper borosilicate alternatives** or **soda-lime glass** (though with reduced durability).

Details:

Little to no signs of use. GSR veers 1730 GS 9.9.4 1730 Used item in great condition. No chips or cracks throughout. Please see pictures for details.

part #: 2955500500 prices

• $34.99-$39.99

specifications plasticwarelabsuppy:

• brand: Kontes Kimble Kimax
• mpn: 295550-0500
• intended use/discipline: Biological Laboratory, Dental Laboratory, Medical Laboratory, Microbiological Laboratory, Physical Laboratory
• unit type: Unit
• country of origin: United States
• additional information: Surplus Laboratory Consumable Supplies

seller plasticwarelabsuppy:

• rating: 99.8%
• city: Cotati, California
• # reviews: 7414

returns plasticwarelabsuppy:

• method: Money back
• time: 30 Days
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• paid by: Seller

general plasticwarelabsuppy:

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

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• options: Ship-to-home
• availability: In Stock
• started: February 12, 2026
• sold: 0
• quantity: 4

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