ACE GLASS Standard Taper Hollow Ptfe Stopper Box 24/25. 12631-15.

( Brand: Ace Glass ), ( Manufacturer Part Number: 12631-15 ), ( Part Type: Stopper Box ), ( Intended Use/discipline: Biological Laboratory, Medical Laboratory, Microbiological Laboratory, Physical Laboratory )

Review ACE GLASS Standard Taper Hollow Ptfe Stopper 24/25. 12631-15. New Open Box

The **Ace Glass 12631-15 Standard Taper Hollow PTFE Stopper (24/25 Box)** is a precision-engineered laboratory accessory designed to provide an airtight, chemically resistant seal for standard taper glassware, ensuring optimal performance in demanding scientific applications. Crafted from high-quality **polytetrafluoroethylene (PTFE)**, this stopper combines exceptional durability with outstanding resistance to a wide range of solvents, acids, bases, and extreme temperatures, making it an ideal choice for laboratories handling aggressive or corrosive substances. The **standard taper (24/25)** design ensures a secure, leak-proof fit with compatible glassware, such as flasks, bottles, and reaction vessels, while the **hollow construction** allows for efficient gas exchange or venting when required, preventing pressure buildup during reactions or distillation processes. Its smooth, non-porous surface minimizes contamination risks and simplifies cleaning, while the **PTFE material** remains inert, ensuring no chemical interactions that could compromise experimental integrity. Whether used in organic synthesis, analytical chemistry, or pharmaceutical development, this stopper delivers reliable performance under rigorous conditions, from ambient temperatures to elevated heating scenarios. The **packaging of 12 stoppers per box** offers cost-effective scalability for laboratories with frequent or bulk requirements, while its universal compatibility with standard taper glassware ensures seamless integration into existing workflows. Built to withstand the demands of modern research, the Ace Glass 12631-15 is a trusted solution for maintaining containment, sterility, and precision in laboratory environments.

The **Ace Glass 12631-15 Standard Taper Hollow PTFE Stopper (24/25 box)** is a common laboratory stopper used in glassware such as flasks, bottles, and reaction vessels. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros**

1. **Chemical Resistance** PTFE (polytetrafluoroethylene) is highly resistant to most acids, bases, solvents, and organic compounds, making it suitable for a wide range of chemical applications. It does not react with or degrade in aggressive environments.

2. **Inertness** Unlike rubber or silicone stoppers, PTFE does not leach contaminants into samples, ensuring purity in analytical and pharmaceutical work. This is critical for sensitive experiments or when working with trace-level compounds.

3. **Temperature Stability** PTFE remains stable over a broad temperature range, typically from **-200 C to 260 C**, making it versatile for heating, cooling, or reflux applications without deformation or degradation.

4. **Low Permeability** PTFE has minimal gas and vapor permeability, which helps maintain the integrity of sealed systems, reducing evaporation or contamination from external sources.

5. **Durability and Longevity** PTFE stoppers are mechanically robust and resistant to abrasion, allowing for repeated use without significant wear. They do not harden or crack over time like some other polymers.

6. **Compatibility with Autoclaving** PTFE can withstand sterilization procedures (e.g., autoclaving at 121 C), making it suitable for microbiological and biomedical applications.

7. **Easy to Clean** PTFE is non-porous, so it can be thoroughly cleaned with solvents, detergents, or even harsh chemicals without retaining residues. This reduces cross-contamination risks.

8. **Standardized Fit** The **24/25** taper is a common laboratory standard, ensuring compatibility with most glassware designed for this joint. This makes it easy to source replacements or accessories.

9. **Non-Stick Surface** PTFE s low surface energy prevents liquids and solids from adhering, simplifying the removal of residues after experiments.

10. **Wide Availability** As a legacy product from Ace Glass, it is widely stocked by laboratory suppliers, ensuring availability for routine and emergency use.

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### **Cons**

1. **Limited Flexibility** PTFE is rigid and lacks the elasticity of rubber or silicone stoppers. This can make it difficult to seal tightly in some glassware, especially if the joint is not perfectly aligned or if the glassware is slightly deformed.

2. **Poor Seal Under Pressure** Unlike rubber or silicone, PTFE does not compress to form a tight seal under pressure. This can lead to leaks in applications requiring high-pressure containment (e.g., some distillation setups or pressurized reactors).

3. **High Cost** PTFE stoppers are generally more expensive than alternatives like rubber or silicone, particularly for high-purity or custom sizes. Bulk purchases may not offer significant cost savings.

4. **Limited Compatibility with High-Viscosity Liquids** PTFE s smooth surface can make it difficult to hold viscous liquids or slurries in place, as they may slip out of the stopper without additional securing methods (e.g., clamps or additional seals).

5. **Potential for Static Buildup** PTFE is a poor conductor of electricity and can generate static charge, which may be problematic in electrostatic-sensitive applications or when handling flammable vapors.

6. **Not Ideal for Extreme Mechanical Stress** While durable, PTFE stoppers can crack or chip if subjected to excessive force (e.g., repeated hammering or improper handling). This is less of an issue for standard laboratory use but could be a concern in rugged environments.

7. **Limited Color Options** PTFE stoppers are typically white or off-white, which may not be ideal for applications requiring UV transparency or specific color coding.

8. **Potential for Outgassing at High Temperatures** While PTFE is stable at high temperatures, prolonged exposure to extreme heat (e.g., above 260 C) may cause slight outgassing or degradation, though this is rare in typical lab settings.

9. **Not Suitable for All Solvents Under Prolonged Contact** While PTFE is resistant to most solvents, some highly fluorinated or exotic solvents may have unknown long-term effects on the material over extended periods.

10. **Disposal Considerations** PTFE is not biodegradable, and improper disposal may contribute to environmental concerns. However, this is a general issue with many plastics and not specific to this product.

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### **Conclusion**

The **Ace Glass 12631-15 Standard Taper Hollow PTFE Stopper (24/25)** is an excellent choice for laboratories requiring **chemical inertness, temperature stability, and purity** in applications such as organic synthesis, analytical chemistry, or pharmaceutical processing. Its resistance to corrosion, solvents, and high temperatures makes it indispensable for many routine and specialized tasks. However, its **lack of flexibility, higher cost, and limited sealing performance under pressure** may make it less ideal for applications requiring tight, dynamic seals or high-pressure containment.

For most **standard laboratory uses** such as sealing flasks, bottles, or reaction vessels where chemical resistance and inertness are priorities the pros outweigh the cons. Alternatives like rubber or silicone stoppers may be preferable for applications needing better sealing under pressure or flexibility, but they sacrifice chemical resistance and purity.

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### **Recommendation**

- You are working with **aggressive chemicals, solvents, or high-purity samples** where contamination must be avoided.

- Your applications involve **heating, cooling, or reflux** within the PTFE s temperature range.

- You require **long-term durability and ease of cleaning** without degradation.

- Compatibility with **24/25 standard taper glassware** is a priority.

- You need **better sealing under pressure** (e.g., for distillation or pressurized reactions).

- Your budget is constrained, and cost savings are a priority.

- Flexibility or elasticity is required for sealing irregular or dynamic systems.

For most **general-purpose laboratory use**, the PTFE stopper is a **highly reliable and cost-effective choice** despite its limitations. Ensure proper handling to avoid leaks, and pair it with appropriate glassware for optimal performance.

Details:

New - open box Standard Taper Hollow PTFE Stopper 24/25. Ace Glass 12631-15.

part #: 1263115 price

• $18.00

specifications plasticwarelabsuppy:

• brand: Ace Glass
• mpn: 12631-15
• part type: Stopper Box
• intended use/discipline: Biological Laboratory, Medical Laboratory, Microbiological Laboratory, Physical Laboratory

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• Medical, Lab Dental Supplies > Glassware Plasticware > Other Medical Lab Glassware

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