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  3. KIMBLE 850400-1420

KIMBLE 850400-1420 Hex Head Hollow Glass Stopper 14/20

850400-1420 Kimble # Medium Length Hex Head Hollow Glass Stopper 14/20

( Brand: Kimble ), ( Manufacturer Part Number: 850400-1420 ), ( Part Type: Head Stopper ), ( Country Of Origin: United States ), ( Unit Type: Unit ), ( Intended Use/discipline: Biological Laboratory, Medical Laboratory, Microbiological Laboratory )

Review KIMBLE Medium Length Hex Head Hollow Glass Stopper 14/20

The **Kimble 850400-1420 Hex Head Hollow Glass Stopper** is a precision-engineered laboratory accessory designed for applications requiring secure, leak-proof sealing in glassware while allowing for easy removal and reuse. Crafted from high-quality borosilicate glass, this stopper features a robust **hexagonal head** with a smooth, durable finish that ensures a tight, consistent seal when threaded into standard **14/20 joint glassware**, such as flasks, bottles, or reaction vessels. The **hollow design** of the stopper creates a vented pathway, making it ideal for applications where pressure buildup must be managed such as in distillation setups, vacuum filtration, or controlled gas release systems. The **hex head** provides a secure grip for manual insertion and removal, reducing the risk of slippage or damage to the glass joint, while its symmetrical shape allows for easy orientation during use. Constructed to meet rigorous laboratory standards, this stopper is resistant to thermal shock, chemical corrosion, and mechanical stress, ensuring long-term reliability in demanding environments. Whether used in analytical chemistry, pharmaceutical research, or industrial processes, the Kimble 850400-1420 delivers a balance of functionality, durability, and precision, making it an indispensable component for maintaining sterile, controlled conditions in glassware systems.

### **Pros and Cons of buying a Kimble 850400-1420 Hex Head Hollow Glass Stopper (14/20 Joint)**

#### **Pros:**

1. **High-Quality Glass Construction** Kimble products are known for their durable, borosilicate glass, which is resistant to thermal shock and chemical corrosion. This makes the stopper suitable for laboratory applications requiring precision and longevity.

2. **Standardized 14/20 Joint** The 14/20 joint is a widely accepted laboratory standard, ensuring compatibility with most glassware, flasks, and reaction vessels. This makes it easy to integrate into existing lab setups without needing custom adapters.

3. **Hollow Design** The hollow interior allows for controlled gas flow or venting, which can be useful in experiments requiring pressure regulation, distillation, or solvent extraction.

4. **Hex Head for Secure Fitting** The hex-shaped head provides a firm grip, making it easier to insert and remove the stopper without slipping. This is particularly helpful in applications where precision is critical.

5. **Chemical Resistance** Borosilicate glass is inert to most acids, bases, and organic solvents, making this stopper ideal for aggressive chemical environments.

6. **Reusable and Cost-Effective** Unlike disposable stoppers, this glass stopper can be cleaned and reused multiple times, reducing long-term costs in laboratory settings.

7. **Compatibility with Vacuum Systems** The design may support vacuum applications, depending on the specific setup, though this would depend on additional sealing methods.

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#### **Cons:**

1. **Fragility Compared to Plastic or Metal** Glass is more prone to breakage than plastic or metal stoppers, especially if dropped or subjected to thermal stress. This could lead to costly replacements if mishandled.

2. **Limited Temperature Range** While borosilicate glass is heat-resistant, extreme temperatures (e.g., rapid heating or cooling) can still cause cracking or failure if not managed properly.

3. **Weight** Glass stoppers are heavier than plastic alternatives, which may make them less convenient for frequent adjustments or use in portable setups.

4. **Potential for Contamination** If not cleaned thoroughly, glass stoppers can harbor residues from previous experiments, which may affect subsequent procedures. Proper cleaning protocols are essential.

5. **Cost Relative to Disposable Options** While reusable, the initial purchase price may be higher than disposable rubber or plastic stoppers, though this is offset by long-term savings.

6. **Sealing Challenges** Glass stoppers may require additional sealing methods (e.g., grease or silicone) to prevent leaks, especially in vacuum or high-pressure applications. Improper sealing can compromise experiments.

7. **Limited Flexibility in Sizing** Unlike some plastic stoppers, glass stoppers are not easily modified or resized. If the joint does not fit perfectly, it may not seal effectively.

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### **Conclusion:**

The **Kimble 850400-1420 hex head hollow glass stopper** is an excellent choice for laboratory applications requiring durability, chemical resistance, and standardized compatibility. Its borosilicate construction ensures reliability in demanding environments, and the 14/20 joint makes it universally adaptable. However, its fragility, weight, and need for careful handling may pose challenges in some settings. If the application involves frequent adjustments, high thermal stress, or extreme conditions, alternative materials (e.g., PTFE-lined plastic stoppers) might be worth considering.

For most standard laboratory uses such as distillation, solvent storage, or controlled reactions the benefits of this glass stopper outweigh its drawbacks, making it a **highly recommended purchase** for researchers prioritizing precision and longevity.

**Final Recommendation:** Purchase this stopper if you need a durable, reusable, and chemically resistant solution for 14/20 joint applications. Ensure proper handling and cleaning to maximize its lifespan. If your workflow involves extreme conditions or frequent stop-and-go operations, evaluate whether a reinforced or alternative material would better suit your needs.

Details:

Specifications. KIMBLE Medium length Hex Head Hollow Glass Stopper, 14/20: Hollow, hexagonal head medium length Standard Taper stopper that is easily gripped. May be set on the flattened top to avoid contamination of ground surface.

part #: 8504001420 prices

  • $29.77-$84.72

specifications plasticwarelabsuppy:

  • brand: Kimble
  • mpn: 850400-1420
  • part type: Head Stopper
  • country of origin: United States
  • unit type: Unit
  • intended use/discipline: Biological Laboratory, Medical Laboratory, Microbiological Laboratory

shipping plasticwarelabsuppy:

  • transit: 2-3 Days
  • cost: $0.00
  • carrier: FedEx, USPS
  • service: FedEx 2Day, USPS Priority Mail
  • class: Expedited
  • type: Calculated

offer plasticwarelabsuppy:

  • started: March 3, 2026
  • quantity: 2
  • availability: In Stock
  • options: Ship-to-home
  • sold: 0

general plasticwarelabsuppy:

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

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  • # reviews: 37
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part type: head stopper, country of origin: united states, unit type: unit, intended use/discipline: biological laboratory, medical laboratory, microbiological laboratory,
category: business & industrial > medical, lab dental supplies > glassware plasticware > medical lab glassware, sku: 13383420215537604,
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3 offers $29.77–$84.72 USD
  • New. Offer #1 priced at $29.77 + $0.00 shipping estimate = $29.77* total. FREE SHIPPING
  • Used. Offer #2 priced at $45.00 + $0.00 shipping estimate = $45.00* total. May be set on the flattened top to avoid contamination of the ground surface.FREE SHIPPING
  • New. Offer #3 priced at $84.72 + $0.00 shipping estimate = $84.72* total. FREE SHIPPING

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