VWR 59580-182 Rubber Stopper Top Od Bottom 25MM 27MM 23MM

( Brand: Vwr ), ( Manufacturer Part Number: 59580-182 ), ( Part Type: Stopper ), ( Country Of Origin: United States ), ( Intended Use/discipline: Biological Laboratory, Dental Laboratory, Microbiological Laboratory, Physical Laboratory )

Review VWR Lot Rubber Stopper #5 25mm Length 27mm Top Od 23mm Bottom

The **VWR 59580-182 20 mm Rubber Stopper with a 25 mm Top OD and 23 mm Bottom OD** is a precision-engineered laboratory accessory designed for secure, leak-proof sealing in a wide range of scientific and industrial applications. Crafted from high-quality natural rubber, this conical stopper features a tapered design that ensures a snug, airtight fit within glassware, including flasks, bottles, and reaction vessels, while minimizing the risk of contamination or spillage. The stopper s **25 mm outer diameter (OD) at the top** provides a broad sealing surface for compatibility with standard laboratory glassware, such as 250 mL to 1 L Erlenmeyer flasks, while its **23 mm OD at the bottom** allows for a gradual transition, reducing stress on the glass and preventing cracking over time. The **20 mm length** strikes an optimal balance between functionality and space efficiency, making it ideal for applications where vertical clearance is limited. Its durable rubber construction offers excellent chemical resistance to a broad spectrum of solvents, acids, and bases, ensuring reliability in both routine and demanding laboratory procedures. Whether used for storing reagents, filtering solutions, or protecting reaction mixtures from external contaminants, this stopper delivers consistent performance with minimal maintenance. Its smooth, non-porous surface also facilitates easy cleaning and sterilization, making it a versatile choice for microbiology, chemistry, and analytical laboratories. Built to meet stringent quality standards, this stopper is a dependable component for any experiment requiring a reliable, reusable seal.

### **Pros and Cons of buying a VWR 59580-182 20 Rubber Stopper (25mm OD, 27mm ID, 23mm Top OD, 23mm Bottom OD)**

1. **High-Quality Material** Made from durable rubber, this stopper is designed for repeated use in laboratory settings without degrading quickly. The material is resistant to many chemicals, making it suitable for general lab applications.

2. **Standardized Dimensions** The specified measurements (25mm OD, 23mm top/bottom OD, 27mm ID) ensure compatibility with common lab glassware, such as Erlenmeyer flasks, beakers, and test tubes. This reduces the risk of leaks or improper fits.

3. **Versatile Use** The conical shape and size make it adaptable for sealing flasks, bottles, and other containers in chemistry, biology, and general lab work. It can also serve as a stopper for simple filtration setups.

4. **Cost-Effective for Bulk Use** While individual stoppers are inexpensive, purchasing in bulk (as suggested by the "20" in the part number) can be more economical for labs that require frequent replacements.

5. **Easy to Clean and Sterilize** Rubber stoppers can be washed with mild detergents or sterilized with ethanol or autoclaving (if the material is compatible). They are reusable, reducing waste compared to disposable alternatives.

6. **Wide Availability** As a VWR product, it is readily available through scientific suppliers, ensuring quick replacement if needed. It is also a common item found in many lab catalogs.

7. **Low Maintenance** Unlike some plastic or silicone stoppers, rubber does not require special lubricants or coatings to function properly, simplifying storage and handling.

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1. **Chemical Compatibility Limitations** While rubber is resistant to many common lab chemicals, it may degrade or swell when exposed to strong acids, bases, organic solvents (e.g., acetone, chloroform), or oils. Always check the manufacturer s guidelines for specific chemical resistance.

2. **Potential for Leaks** If the stopper is not the correct size for the container or if it becomes warped or cracked over time, it may not seal properly, leading to leaks or contamination. This is especially true if the glassware has uneven openings.

3. **Durability Concerns** With frequent use, rubber stoppers can develop cracks, harden, or lose elasticity, reducing their effectiveness. They may need to be replaced more often than plastic or silicone alternatives in high-wear environments.

4. **Limited Temperature Resistance** Rubber stoppers may soften or degrade at high temperatures (above 60 80 C) or become brittle at very low temperatures. For extreme temperature applications, other materials (e.g., silicone or Teflon) may be more suitable.

5. **Potential for Microbial Growth** If not cleaned thoroughly after use, rubber stoppers can harbor bacteria or fungi, especially in moist environments. This is less of an issue with frequent sterilization but is something to consider for long-term storage.

6. **Not Ideal for Vacuum Applications** Unlike glass stoppers with ground joints, rubber stoppers are not designed for vacuum-sealed systems. They may not provide an airtight seal under negative pressure.

7. **Environmental Concerns** While reusable, rubber stoppers contribute to plastic waste if not disposed of properly. Some labs may prefer more eco-friendly alternatives, though rubber is generally more sustainable than single-use plastics.

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The **VWR 59580-182 20 Rubber Stopper** is a practical and widely used item in laboratories for general sealing applications. Its **durability, compatibility with standard glassware, and cost-effectiveness** make it a reliable choice for routine lab tasks. However, its **limited chemical resistance, temperature constraints, and potential for wear** mean it may not be ideal for specialized or high-stress applications.

For most **basic laboratory needs** (e.g., sealing flasks, bottles, or simple filtration), this stopper is a **good, budget-friendly option**. If your work involves **aggressive chemicals, extreme temperatures, or vacuum systems**, consider alternatives like **silicone stoppers, Teflon-coated stoppers, or glass stoppers with ground joints**.

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- **Buy it if:** You need a **standard, affordable rubber stopper** for general lab use (e.g., chemistry experiments, biology storage, or simple filtration) and your chemicals are not highly corrosive or solvent-based.

- **Avoid or consider alternatives if:** You work with **strong acids/bases, organic solvents, or high temperatures**, or if you require **vacuum-tight seals**. In such cases, opt for **silicone, Teflon, or glass stoppers** instead.

- **Storage Tip:** Keep stoppers in a **cool, dry place** and replace them if they show signs of cracking or hardening to maintain seal integrity.

For most standard lab applications, this stopper is a **solid, cost-effective choice**.

Details:

This item has been cleaned and handled in accordance with the manufacturers instructions. Does not pertain to this listing.

part #: 59580182 prices

• $16.40-$32.99

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• brand: Vwr
• mpn: 59580-182
• part type: Stopper
• country of origin: United States
• intended use/discipline: Biological Laboratory, Dental Laboratory, Microbiological Laboratory, Physical Laboratory

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

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