CHEMGLASS CG-424-73 Ptfe Stopcock Plug 16/35

( Brand: Chemglass ), ( Manufacturer Part Number: CG-424-73 ), ( Part Type: Stopcock Plug ), ( Unit Type: Unit ), ( Country Of Origin: United States ), ( Intended Use/discipline: Biological Laboratory, Dental Laboratory, Medical Laboratory, Microbiological Laboratory, Physical Laboratory )

Review CHEMGLASS Ptfe Stopcock 6mm Bore 16/35 Plug Size Lot Of Stopcocks

The **Chemglass CG-424-73 PTFE Stopcock with 16/35 Plug Stopcocks** is a precision-engineered, high-performance valve designed for demanding laboratory applications where reliability, chemical resistance, and leak-free performance are paramount. Constructed from **polytetrafluoroethylene (PTFE)**, this stopcock offers an unmatched combination of inertness and durability, making it ideal for use with aggressive solvents, strong acids, bases, and high-purity reagents where traditional glass or rubber components would degrade or fail. The **16/35 joint standard** ensures seamless compatibility with a vast array of glassware, including condensers, adapters, and reaction vessels, while the **PTFE plug mechanism** provides smooth, frictionless operation even after prolonged use or repeated cycling. Unlike conventional stopcocks that rely on rubber gaskets or cork seals, this design eliminates the risk of contamination or cross-reactivity, making it a preferred choice in pharmaceutical synthesis, analytical chemistry, and materials science. The **smooth, tapered PTFE plug** allows for precise flow control, reducing dead volume and minimizing sample loss during transfers or reactions, while the **reinforced PTFE body** resists warping or deformation under thermal stress, ensuring consistent performance across a wide temperature range. Whether used in routine laboratory procedures or specialized applications such as vacuum distillation, solvent extraction, or high-pressure reactions, the **Chemglass CG-424-73** delivers exceptional longevity and chemical compatibility, reinforcing its status as a cornerstone component in modern glassware assemblies. Its robust construction and inert properties make it an indispensable tool for researchers seeking both efficiency and purity in their experimental workflows.

**Pros and Cons of buying a Chemglass CG-424-73 PTFE Stopcock (16/35 Plug Stopcocks)**

### **Pros**

1. **High Chemical Resistance** The PTFE (polytetrafluoroethylene) construction ensures compatibility with a wide range of aggressive chemicals, acids, bases, and solvents, making it ideal for laboratory applications.

2. **Durability and Longevity** PTFE is highly resistant to corrosion, wear, and temperature fluctuations, extending the stopcock s service life compared to glass or rubber alternatives.

3. **Low Permeability** PTFE has minimal gas and vapor permeability, which is critical for experiments requiring an airtight seal, such as vacuum systems or gas chromatography.

4. **Smooth Operation** The design allows for precise control of flow with minimal friction, reducing the risk of leaks or blockages over time.

5. **Compatibility with Standard Glassware** The 16/35 joint size is a common laboratory standard, ensuring easy integration with other glassware, adapters, and connectors.

6. **Reusable and Maintainable** Unlike disposable stopcocks, this model can be cleaned and reused, making it cost-effective for frequent use.

7. **Temperature Resistance** PTFE remains stable across a broad temperature range (typically -200 C to 260 C), suitable for both cryogenic and high-temperature applications.

8. **Non-Stick Surface** The PTFE coating prevents residue buildup, simplifying cleaning and reducing contamination risks in sensitive experiments.

### **Cons**

1. **Limited Pressure Rating** While PTFE is strong, it may not handle extremely high pressures as effectively as metal or reinforced glass stopcocks, which could be a limitation in high-pressure applications.

2. **Potential for Wear Over Time** Although durable, the PTFE plug and seat may eventually wear down with prolonged or heavy use, requiring eventual replacement.

3. **Cost Compared to Basic Alternatives** PTFE stopcocks are more expensive than simpler glass or rubber stopcocks, which may not be justified for low-budget or non-corrosive applications.

4. **Not Ideal for High-Vacuum Systems** While PTFE performs well in many vacuum applications, it may outgas slightly under extreme vacuum conditions, potentially introducing contaminants.

5. **Limited Color Coding** Unlike some glass stopcocks, PTFE models lack built-in color indicators for flow direction or function, requiring external labeling.

6. **Potential for PTFE Contamination** In highly sensitive applications (e.g., trace analysis), trace amounts of PTFE particles or leachates could theoretically interfere with results, though this is rare with high-quality PTFE.

7. **Specialized Maintenance** Unlike glass, PTFE cannot be easily repaired with heat or annealing; damaged parts may require full replacement.

### **Conclusion**

The **Chemglass CG-424-73 PTFE stopcock** is an excellent choice for laboratories requiring **chemical resistance, durability, and precision control** in applications involving corrosive substances, solvents, or temperature extremes. Its **low permeability, smooth operation, and compatibility with standard glassware** make it a versatile tool for general laboratory use, particularly in chemistry, biochemistry, and materials science. However, if the application involves **extremely high pressures, ultra-high vacuum, or cost-sensitive environments**, alternative materials (e.g., glass, metal, or reinforced PTFE) may be more suitable.

### **Recommendation**

- You work with **corrosive chemicals, solvents, or require a long-lasting, low-maintenance stopcock**.

- Your setup uses **16/35 glass joints**, ensuring seamless integration.

- You prioritize **chemical inertness, temperature resistance, and smooth operation** over cost.

- You need a **reusable, high-performance alternative** to disposable or less durable stopcocks.

- Your application demands **ultra-high vacuum or extreme pressure** (e.g., >100 psi), where metal or reinforced glass stopcocks may be better.

- Budget constraints are critical, and you can use a **simpler glass or rubber stopcock** for non-corrosive liquids.

- You require **built-in flow indicators** (e.g., color-coded glass stopcocks).

For most **general-purpose laboratory use**, this PTFE stopcock is a **highly recommended investment** due to its reliability and versatility.

Details:

Chemglass CG-424-73 PTFE Stopcock 6mm Bore 16/35 Plug Size Lot of 2 Stopcocks.

part #: cg42473 prices

• $55.00-$89.99

specifications plasticwarelabsuppy:

• brand: Chemglass
• mpn: Cg-424-73
• part type: Stopcock Plug
• unit type: Unit
• country of origin: United States
• intended use/discipline: Biological Laboratory, Dental Laboratory, Medical Laboratory, Microbiological Laboratory, Physical Laboratory

general plasticwarelabsuppy:

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

returns plasticwarelabsuppy:

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

shipping plasticwarelabsuppy:

• class: Standard, Expedited
• cost: $0.00
• transit: 3-9 Days
• carrier: USPS
• type: Fixed
• service: USPS Ground Advantage, Expedited

payments plasticwarelabsuppy:

• other
• wallet: Google-pay
• credit card: Mastercard

offer plasticwarelabsuppy:

• availability: In Stock
• started: March 25, 2026
• options: Ship-to-home
• sold: 0
• quantity: 1
• best offers: True

seller plasticwarelabsuppy:

• city: Ponder, Texas
• # reviews: 2277
• rating: 100.0%

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