CHEMGLASS CG-424-75 Ptfe Stopcock Plug 15.2/30

( Brand: Chemglass ), ( Manufacturer Part Number: CG-424-75 ), ( 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 4mm Bore 15.2/30 Plug Size Lot Of Stopcocks

The **Chemglass CG-424-75 PTFE Stopcock with 15.2/30 Plug** is a precision-engineered, high-performance valve designed for demanding laboratory applications where reliability, chemical resistance, and leak-free performance are paramount. Constructed from durable **glass** with a **polytetrafluoroethylene (PTFE) plug**, this stopcock delivers exceptional resistance to a wide range of aggressive solvents, acids, bases, and organic compounds, making it an ideal choice for chemical synthesis, chromatography, distillation, and other corrosive environments. The **15.2/30 plug** features a **30-degree taper** for a secure, self-sealing seal that minimizes dead volume and ensures consistent flow control, while the **15.2mm (5/16") standard bore** provides compatibility with common laboratory glassware and connectors. The **PTFE plug** is machined to tight tolerances, allowing for smooth, frictionless operation with minimal wear over extended use, and its non-reactive nature prevents contamination of sensitive samples. The **glass body** is precision-bored and polished to a smooth finish, reducing the risk of particulate generation and ensuring clarity for visual monitoring of flow. This stopcock is particularly well-suited for applications requiring **ultra-pure conditions**, such as pharmaceutical manufacturing, analytical chemistry, and high-purity solvent handling. Its **threaded connections** (standard 15.2/30 taper) allow for easy integration into existing glassware assemblies, while the **durable PTFE plug** ensures long-term durability even under repeated use. Whether used in a research lab, industrial setting, or quality control environment, the Chemglass CG-424-75 delivers the precision, chemical resistance, and leak-proof performance required for critical fluid handling tasks.

### **Pros and Cons of buying a Chemglass CG-424-75 PTFE Stopcock (15.2/30 Plug)**

1. **High-Quality Construction** Chemglass is a well-established manufacturer known for producing durable, precision-engineered glassware. The PTFE (polytetrafluoroethylene) stopcock is designed to resist chemical corrosion, making it suitable for a wide range of laboratory applications, including strong acids, bases, and organic solvents.

2. **Compatibility with Standard Joints** The **15.2/30** joint size is a common standard in laboratory glassware, ensuring compatibility with most glassware, adapters, and connectors. This makes it easy to integrate into existing setups without needing specialized fittings.

3. **Low-Permeability PTFE Plug** PTFE is chemically inert and has low permeability to gases and vapors, reducing the risk of contamination or leaks. This is particularly useful in applications involving volatile or reactive substances.

4. **Durability and Longevity** Chemglass products are built to last, with reinforced joints and sturdy construction that can withstand repeated use and sterilization processes (e.g., autoclaving, if compatible with the specific model).

5. **Easy to Clean and Maintain** The smooth glass surface and PTFE plug are relatively easy to clean, reducing the risk of residue buildup that could affect experimental results. It can typically be cleaned with solvents or mild detergents.

6. **Wide Temperature Range** PTFE stopcocks can operate effectively across a broad temperature range, making them suitable for both low-temperature and high-temperature applications (though extreme temperatures may still require consideration of the connected glassware).

7. **Precision Control** The stopcock allows for fine control over flow rates, making it ideal for applications requiring gradual or precise liquid dispensing, such as in chromatography, distillation, or titration setups.

8. **Compatibility with Vacuum Systems** The design can often handle vacuum applications, though this depends on the specific setup and whether the stopcock is properly sealed.

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1. **Limited Pressure Rating** Standard glass stopcocks like this one are not designed for high-pressure applications. They are typically rated for low to moderate pressure (often under 1-2 bar). For high-pressure work, specialized stopcocks or metal fittings are required.

2. **Potential for Leaks Over Time** Even with PTFE plugs, glass stopcocks can develop leaks if the PTFE degrades, the glass cracks, or the joints become misaligned. Regular inspection is necessary to prevent failures.

3. **Fragility of Glass** Glassware is inherently brittle and can shatter if dropped or subjected to thermal shock (e.g., rapid heating or cooling). This makes it less suitable for rough handling environments.

4. **Limited Temperature Extremes** While PTFE is stable over a wide range, the glass itself may have limitations at very high or low temperatures. For example, certain types of glass (e.g., borosilicate) may crack if exposed to thermal stress.

5. **Maintenance Requirements** PTFE plugs can wear out over time, especially with frequent use, and may need replacement. The stopcock may also require periodic lubrication (if applicable) to ensure smooth operation.

6. **Cost Compared to Alternatives** Chemglass stopcocks are generally more expensive than plastic or metal alternatives. For disposable or low-cost applications, other materials (e.g., polypropylene or stainless steel) may be more economical.

7. **Not Ideal for Highly Corrosive or Abrasive Chemicals** While PTFE is resistant to many chemicals, some highly aggressive substances (e.g., certain fluorinated compounds or strong oxidizers) may still degrade the PTFE over time.

8. **Size and Weight Constraints** The 15.2/30 joint size is standard but may not fit all setups. Larger or more complex systems might require different joint sizes or configurations.

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The **Chemglass CG-424-75 PTFE stopcock (15.2/30 plug)** is a reliable, high-quality choice for laboratory applications requiring chemical resistance, precision control, and compatibility with standard glassware. Its PTFE plug ensures low permeability and durability against a wide range of solvents and reagents, making it ideal for general laboratory use, including distillation, filtration, and chromatography. However, its fragility, limited pressure and temperature ratings, and maintenance requirements mean it is not suitable for high-pressure, high-temperature, or rough-use environments.

- You need a durable, chemically resistant stopcock for standard laboratory applications.

- Your setup requires **15.2/30** joint compatibility.

- You prioritize low leakage and ease of cleaning.

- Your work involves moderate pressure and temperature conditions.

- You require **high-pressure or high-temperature** applications (opt for metal or reinforced stopcocks).

- Your setup involves **frequent thermal shock** or rough handling (consider plastic or metal alternatives).

- You need **disposable or cost-effective** solutions (plastic stopcocks may suffice).

- Your chemicals are **extremely aggressive** (e.g., certain fluorinated compounds) and may degrade PTFE over time.

For most standard laboratory setups, this Chemglass stopcock is a **strong, practical choice** due to its reliability and compatibility. However, always verify its compatibility with your specific chemicals, pressure, and temperature requirements before purchasing.

Details:

Chemglass CG-424-75 PTFE Stopcock 4mm Bore 15.2/30 Plug Size Lot of 2 Stopcocks.

part #: cg42475 price

• $50.00

specifications plasticwarelabsuppy:

• brand: Chemglass
• mpn: Cg-424-75
• 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

payments plasticwarelabsuppy:

• other
• wallet: Apple-pay
• credit card: Discover

shipping plasticwarelabsuppy:

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

returns plasticwarelabsuppy:

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

offer plasticwarelabsuppy:

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

general plasticwarelabsuppy:

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

seller plasticwarelabsuppy:

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

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