KIMAX KIMBLE KONTES 25285-500 Dwk Glass Single Neck Round 500ML 24/40 Bottom Boiling Flask

( Brand: Kimax Kimble Kontes ), ( Manufacturer Part Number: 25285-500 ), ( 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 24/40 Single Neck Round Bottom Boiling Flask

The **Kimble Kontes 25285-500 DWK Glass 500 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 high-quality borosilicate glass (Type 1, conforming to ASTM E438 and ISO 3585 standards), this flask is designed to withstand extreme thermal and chemical stresses, ensuring durability and reliability in demanding laboratory environments. Its **500 mL capacity** strikes an ideal balance between versatility and efficiency, making it suitable for small-scale synthesis, distillation, reflux reactions, and boiling operations where controlled heating and condensation are required. The **single neck** features a **24/40 standard taper joint**, a universally compatible ground glass joint that allows seamless connection to a variety of adapters, condensers, funnels, and other glassware components, enhancing the flask s adaptability for complex experimental setups. The **round bottom design** optimizes heat distribution and minimizes hot spots, reducing the risk of thermal shock and improving reaction efficiency by promoting even boiling and vaporization. Whether used in organic synthesis, analytical chemistry, or educational demonstrations, this flask s smooth, polished surface and precise dimensions ensure consistent performance and ease of cleaning, while its **double-walled (DWK) construction** (if applicable to the model) provides additional thermal insulation, reducing energy consumption and improving safety during high-temperature procedures. Built to meet stringent industry standards, the Kimble Kontes 25285-500 is a trusted choice for laboratories prioritizing precision, longevity, and compatibility with advanced glassware systems.

### **Pros and Cons of buying a Kimble-Kontes 25285-500 DWK Glass 500 mL 24/40 Single Neck Round Bottom Boiling Flask**

1. **High-Quality Borosilicate Glass (Type 1 or 3.3)**

- Resistant to thermal shock, chemical corrosion, and mechanical stress, making it ideal for laboratory applications.

- Long-lasting durability compared to lower-grade glassware.

2. **Standard 24/40 Joint Compatibility**

- Fits seamlessly with most laboratory glassware, adapters, and accessories, ensuring versatility in setups.

- Widely available replacements and modifications if needed.

3. **Precision Engineering**

- Designed for even heating and boiling, reducing hot spots and improving reaction efficiency.

- Smooth, polished interior minimizes residue buildup and contamination.

4. **Safety and Reliability**

- Glass is non-reactive with most chemicals, reducing the risk of contamination.

- No plastic or metal components that could degrade or leach contaminants over time.

5. **Widely Recognized Brand**

- Kimble-Kontes (a Corning brand) is a trusted name in laboratory glassware, ensuring consistent quality.

- Backed by manufacturer warranties and customer support for replacements or defects.

6. **Compatibility with Standard Laboratory Equipment**

- Works with condensers, reflux setups, heating mantles, and other glassware accessories.

- Suitable for distillation, reflux, and boiling applications in chemistry, biochemistry, and related fields.

7. **Easy to Clean and Maintain**

- Can be cleaned with standard laboratory detergents, sonication, or acid washing.

- Resistant to thermal expansion, reducing the risk of cracking during cleaning.

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1. **Fragility**

- Glass is prone to breaking if dropped or subjected to sudden temperature changes, requiring careful handling.

- More delicate than plastic or metal alternatives, increasing the risk of damage in rough environments.

2. **Weight**

- Heavier than plastic or some metal alternatives, which can be cumbersome for frequent use or large-scale operations.

- May require additional support during heating or stirring.

3. **Cost**

- More expensive upfront compared to lower-quality glassware or plastic alternatives.

- Replacement costs can add up if the flask is frequently damaged.

4. **Limited Chemical Resistance (Relative to Specialty Glass)**

- While borosilicate is highly resistant, extremely aggressive chemicals (e.g., hydrofluoric acid) may still cause damage over time.

- Not suitable for all high-corrosive applications without additional considerations.

5. **Maintenance of Joints and Seals**

- The 24/40 joint requires proper lubrication (e.g., high-vacuum grease) for airtight seals, which adds to maintenance.

- Improper lubrication can lead to leaks or contamination.

6. **Not Ideal for High-Pressure Applications**

- Standard borosilicate glass flasks are not designed for high-pressure reactions; specialized pressure vessels are required for such uses.

7. **Environmental and Disposal Considerations**

- Glass is non-biodegradable and requires proper disposal as laboratory waste, which may incur additional costs.

- Recycling options may be limited depending on local facilities.

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The **Kimble-Kontes 25285-500 DWK 500 mL round bottom flask** is a high-quality, versatile, and reliable choice for most laboratory applications involving boiling, reflux, or distillation. Its borosilicate construction ensures durability, chemical resistance, and precision, making it suitable for academic, industrial, and research settings. However, its fragility, weight, and higher cost may be drawbacks depending on the specific needs of the user.

For **general laboratory use, chemical synthesis, or routine reactions**, this flask is an excellent investment due to its reliability and compatibility with standard equipment. If **cost, weight, or ease of handling** are primary concerns, alternatives like plastic (e.g., polypropylene) or metal (e.g., stainless steel) flasks may be considered, though they lack the chemical resistance and thermal properties of glass.

For **high-precision, long-term, or high-value applications**, the trade-offs in fragility and cost are justified by the flask s performance and longevity.

- You require a durable, chemically inert, and thermally stable vessel for boiling, reflux, or distillation.

- You work in a setting where compatibility with standard 24/40 glassware is essential.

- You prioritize quality and longevity over cost or weight concerns.

- You need a lighter, more cost-effective option (e.g., plastic or metal flasks) for non-critical applications.

- Your workflow involves frequent handling or high-risk environments where breakage is a significant concern.

- You require specialized features (e.g., pressure resistance, extreme chemical resistance) not met by standard borosilicate glass.

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 with light writing.

part #: 25285500 prices

• $20.00-$24.99

specifications plasticwarelabsuppy:

• brand: Kimax Kimble Kontes
• mpn: 25285-500
• 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

seller plasticwarelabsuppy:

• rating: 99.8%
• # reviews: 7386
• city: Cotati, California

general plasticwarelabsuppy:

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

returns plasticwarelabsuppy:

• paid by: Seller
• policy: Returns Accepted
• method: Money back
• time: 30 Days

shipping plasticwarelabsuppy:

• cost: $0.00
• transit: 6-13 Days
• carrier: FedEx
• class: Standard, Expedited, One-day
• type: Fixed
• service: Standard, FedEx 2Day, FedEx Standard Overnight

payments plasticwarelabsuppy:

• credit card: Mastercard
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offer plasticwarelabsuppy:

• quantity: 2
• options: Ship-to-home
• availability: In Stock
• started: February 7, 2026
• sold: 0

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