KIMAX KIMBLE KONTES 25285-1000 Glass Single Neck Round Flask 1000ML 29/42 Bottom Chipped

( Brand: Kimax Kimble Kontes ), ( Manufacturer Part Number: 25285-1000 ), ( 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 KIMAX KIMBLE KONTES Glass 1000ml 29/42 Single Neck Round Bottom Flask Chipped #2

The **Kimble-Kontes 25285-1000 1000 mL 29/42 Single Neck Round Bottom Flask** is a high-quality, laboratory-grade glassware item designed for precision and durability in demanding chemical, biological, and analytical applications. Crafted from borosilicate glass (specifically Kimax brand, known for its exceptional thermal resistance and chemical inertness), this flask is engineered to withstand repeated heating, cooling, and exposure to aggressive solvents without compromising structural integrity. With a nominal volume of 1000 milliliters, it features a standard **29/42 joint**, ensuring compatibility with a wide range of laboratory glassware, adapters, and accessories, including condensers, reflux setups, and vacuum systems. The **single neck** configuration provides versatility for attaching various apparatuses, such as stirrers, thermometers, or gas inlet tubes, making it ideal for reactions requiring controlled agitation, temperature monitoring, or gas introduction.

Despite its age or minor cosmetic imperfections such as the noted chipping this flask retains its core functionality and reliability. The **round bottom design** optimizes heat distribution and minimizes dead space, which is critical for efficient reactions, distillation processes, or solvent evaporation. The smooth, polished interior surface reduces the risk of contamination and ensures uniform mixing, while the robust **29/42 joint** guarantees a secure, leak-proof seal when properly fitted with compatible ground glassware. Though the chipping may be superficial and unlikely to affect performance, it underscores the flask s history of use, suggesting it has been well-maintained and is ready for further laboratory applications where cost-effective, durable glassware is preferred over disposable alternatives.

Ideal for educational settings, research laboratories, or industrial processes requiring scalable reactions, this flask is a testament to the enduring utility of borosilicate glass in modern science. Its **1000 mL capacity** strikes a balance between practicality and space efficiency, making it suitable for synthesizing moderate quantities of compounds, conducting titrations, or serving as a reaction vessel in multi-step procedures. Whether used in organic synthesis, biochemical assays, or analytical chemistry, this Kimble-Kontes flask delivers the reliability and precision expected from a trusted name in laboratory glassware even with its minor cosmetic flaw.

### Pros and Cons of Buying a Chipped Kimble Kontes 25285-1000 Glass 1000ml 29/42 Single Neck Round Bottom Flask

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Kimble Kontes flasks are known for their high-quality borosilicate glass, which is resistant to thermal shock and chemical corrosion. This makes them ideal for laboratory applications requiring precision and reliability. Even if chipped, the material itself remains robust for many uses.

The 29/42 joint size is a standard laboratory joint, ensuring compatibility with a wide range of laboratory glassware, adapters, and equipment. This makes it versatile for various setups, including reflux, distillation, or reaction vessels.

The 1000ml capacity is suitable for medium-scale laboratory procedures, such as synthesis, extraction, or heating applications. It strikes a balance between small-scale experiments and larger-scale work.

Single-neck flasks are often used with condensers, addition funnels, or stirrers, making them adaptable for a variety of reactions. The neck allows for easy attachment of accessories.

While the flask is chipped, borosilicate glass is generally durable and long-lasting. If the chip is minor and does not compromise functionality, it may still be a cost-effective option compared to purchasing a new flask.

Borosilicate glass is non-toxic and can be recycled. It does not leach harmful substances, making it safe for handling organic and inorganic chemicals.

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A chipped flask poses a risk of further breakage, especially if subjected to thermal shock (e.g., rapid heating or cooling), mechanical stress, or rough handling. Sharp edges can also cause cuts or injuries to lab personnel.

Chips or cracks can weaken the structural integrity of the flask, increasing the likelihood of leaks during use. This is particularly problematic in vacuum applications or when under pressure.

If the chip is near the joint or neck, it may compromise the seal, making the flask unsuitable for applications requiring a tight fit (e.g., distillation under reduced pressure or high-temperature reactions).

While functionality is the primary concern, a visibly chipped flask may not reflect well in a professional lab setting, especially if appearance matters for client demonstrations or presentations.

Chips or rough edges can trap dust, debris, or chemicals, leading to contamination of samples or reactions. This is particularly critical in sterile or high-purity environments (e.g., pharmaceutical or analytical labs).

If the chip is part of a larger crack or stress point, the flask may eventually fail completely, leading to costly replacements or accidents.

Purchasing a chipped flask may void any warranty or guarantee from the manufacturer. Additionally, using damaged glassware could lead to liability issues if an accident occurs.

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The decision to purchase a chipped Kimble Kontes 25285-1000 flask depends on the intended use, budget, and risk tolerance. If the chip is minor and located away from critical areas (e.g., the neck or joint), and if the flask will be used for non-critical, low-stress applications (e.g., heating under normal atmospheric pressure with careful handling), it *may* be a viable option. However, if the chip is significant, near a joint, or if the flask will be used in high-risk applications (e.g., vacuum, high pressure, or with aggressive chemicals), it is **not recommended** to use it. In such cases, investing in a new or repaired flask is the safer and more professional choice.

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- Examine the chip for size, location, and depth. If the chip is superficial and does not compromise the flask s structural integrity, it may be usable for low-stress applications.

- Avoid using the flask if the chip is near the neck, joint, or base, as these areas are critical for sealing and stability.

- If the flask will be used in routine, non-critical procedures (e.g., heating under reflux with gentle handling), and if the chip does not pose an immediate hazard, it could be used temporarily or for non-critical experiments.

- If the flask will be used in high-risk applications (e.g., distillation, vacuum operations, or with corrosive chemicals), **do not use it**. Replace it immediately to avoid accidents.

- If the chip is minor and you are unsure, consider having the flask professionally inspected or repaired by a glassblower. Some minor chips can be sanded or sealed, but this is not always feasible or safe.

- For peace of mind, especially in professional or high-stakes settings, **purchase a new flask**. The cost of a replacement is often outweighed by the safety and reliability it provides.

- If budget is a concern, consider purchasing a used but intact flask from a reputable supplier. Many lab equipment dealers sell refurbished or gently used glassware at a fraction of the cost of new items.

- For one-time or low-priority uses, a disposable or lower-grade flask (e.g., soda-lime glass) might be a safer alternative to a chipped borosilicate flask.

- Always prioritize safety in the lab. Damaged glassware can lead to injuries, equipment failure, or contamination, which can have serious consequences. Never compromise on safety for cost savings.

**Final Verdict:** Unless the chip is negligible and the flask will be used in a controlled, low-risk manner, **do not purchase the chipped flask**. Invest in a new or repaired one to ensure safety, reliability, and professionalism in your laboratory work.

Details:

See pictures for details. Joint lip shows two chips, larger 5mm wide. Shows minor signs of use with light residue. GSR veers 1730 GS 9.9.4 1730 Used item in good condition.

part #: 252851000 prices

• $19.99-$34.99

specifications plasticwarelabsuppy:

• brand: Kimax Kimble Kontes
• mpn: 25285-1000
• 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

general plasticwarelabsuppy:

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

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