PYREX Laboratory Glass Stopper 5641/25ML/STOPPER

( Brand: Pyrex ), ( Manufacturer Part Number: 5641 ), ( Part Type: Stopper )

Review PYREX Vintage Laboratory Glass 5641/25ml/stopper

The **Pyrex 5641 Laboratory Glass Beaker, 25 mL with Ground Glass Stopper** is a precision-engineered, high-quality glassware essential for demanding laboratory applications where accuracy, durability, and chemical resistance are paramount. Crafted from **borosilicate glass (Type 3.3, Pyrex 5641)**, this beaker is renowned for its exceptional thermal stability, capable of withstanding rapid temperature fluctuations without risking thermal shock or deformation. The borosilicate composition comprising approximately 80% silica with added boron oxide ensures superior resistance to most acids, alkalis, and organic solvents, making it ideal for a wide range of chemical, biological, and analytical procedures. The **ground glass stopper** provides an airtight seal, minimizing evaporation and contamination while allowing for easy transfer of liquids or gases, a critical feature in experiments requiring precise measurements or sensitive reactions. With a **25 mL capacity**, this beaker strikes a balance between utility and space efficiency, making it perfect for small-scale titrations, reagent preparation, or as a component in more complex laboratory setups where compact yet robust glassware is necessary. The smooth, polished interior surface further reduces adsorption of reactive substances, ensuring consistent and reliable experimental results. Whether used in educational settings, pharmaceutical research, or industrial testing, this beaker embodies reliability and precision, adhering to stringent laboratory standards while offering the durability needed for repeated use. Its classic, time-tested design, combined with the unmatched properties of Pyrex glass, makes it a staple in any well-equipped laboratory.

**Pros and Cons of Buying Pyrex 5641 Laboratory Glass (5641/25ml/Stopper)**

1. **Chemical Resistance** Pyrex 5641 glass is made from borosilicate glass, which is highly resistant to most acids, bases, and organic solvents. This makes it ideal for laboratory applications where chemical compatibility is critical.

2. **Thermal Stability** Borosilicate glass has a low coefficient of thermal expansion, meaning it can withstand rapid temperature changes without cracking or breaking. This is useful for heating, cooling, or autoclaving procedures.

3. **Durability and Longevity** Pyrex glass is known for its strength and resistance to thermal shock, making it a long-lasting investment for laboratory use. It is less prone to chipping or breaking compared to soda-lime glass.

4. **Compatibility with Autoclaving** The glass can be safely sterilized in an autoclave (steam autoclave), which is essential for microbiological and medical research applications.

5. **Transparency and Clarity** The glass provides excellent visibility, allowing for precise observations of reactions, cultures, or samples.

6. **Standardized Sizing** The 25ml size with a stopper is a common laboratory volume, making it easy to find compatible equipment, seals, and accessories.

7. **Reusability** Unlike disposable plastic containers, Pyrex glass can be reused multiple times, reducing waste and long-term costs.

8. **Compatibility with Common Laboratory Equipment** It fits standard laboratory setups, including incubators, shakers, and refrigerators, without requiring special adapters.

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1. **Weight and Fragility** While durable, borosilicate glass is heavier than plastic alternatives, which can make handling cumbersome, especially when working with multiple containers. It is also more prone to breakage if dropped or mishandled compared to plastic.

2. **Cost** Pyrex glassware is generally more expensive than disposable plastic or lower-grade glass alternatives. The initial investment may be higher, though it may pay off in the long run due to durability.

3. **Limited Flexibility** Unlike plastic, Pyrex glass cannot be easily modified or cut to custom sizes. If a different volume or shape is needed, it may require purchasing a different container.

4. **Maintenance and Cleaning** Glass can be more difficult to clean than plastic, especially if residues or stains persist. Some stubborn contaminants may require stronger cleaning agents or ultrasonic baths.

5. **Potential for Contamination** If not properly cleaned or sterilized, glassware can harbor microbial growth or chemical residues, which may affect experimental results.

6. **Not Ideal for High-Pressure Applications** While Pyrex is strong, it is not designed for high-pressure environments (e.g., pressure cookers or certain types of reactors). For such applications, specialized glass or metal containers may be required.

7. **Limited Availability of Accessories** Some specialized stoppers, seals, or adapters may not be as readily available for Pyrex glass as they are for plastic or other materials.

8. **Potential for Scratches and Etching** Prolonged use with abrasive materials or harsh chemicals can cause scratches or etching on the glass surface, which may affect transparency or sterility.

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Pyrex 5641 borosilicate glass (25ml with stopper) is an excellent choice for laboratory applications requiring chemical resistance, thermal stability, and durability. Its long-term reliability and compatibility with standard laboratory procedures make it a valuable investment for research, teaching, and routine experiments. However, its higher cost, weight, and maintenance requirements may make it less ideal for applications where disposability or flexibility is prioritized. For most traditional laboratory settings particularly those involving heating, autoclaving, or chemical reactions Pyrex remains a superior option over plastic or lower-grade glass.

If your laboratory work involves **chemical reactions, microbial cultures, or procedures requiring thermal stability**, purchasing Pyrex 5641 glassware is highly recommended. It is particularly well-suited for:

- Microbiology (e.g., bacterial growth, autoclaving)

- Biochemistry (e.g., enzyme assays, small-scale reactions)

- General chemistry (e.g., titrations, heating solutions)

- Educational settings (e.g., teaching labs)

If budget constraints or the need for disposability is a concern, consider supplementing with plastic alternatives for non-critical applications. Always ensure proper handling to minimize breakage and maintain sterility. For high-pressure or extreme conditions, verify compatibility with the specific Pyrex grade or consult manufacturer guidelines.

Details:

Condition is Used. Vintage Pyrex Laboratory Glass 5641/25ml/stopper. Shipped with FedEx Ground Economy.

part #: 5641 prices

• $12.00-$199.99

specifications plasticwarelabsuppy:

• brand: Pyrex
• mpn: 5641
• part type: Stopper

general plasticwarelabsuppy:

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

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• carrier: FedEx
• type: Calculated
• transit: 3-9 Days
• cost: $6.83
• service: FedEx Ground Economy
• class: Economy

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seller plasticwarelabsuppy:

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• # reviews: 1760
• city: Catonsville, Maryland

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• availability: In Stock
• options: Ship-to-home
• started: April 1, 2026
• quantity: 1

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