WHEATON 240680 Phenolic Cap Labware Screw Pack 33-430

( Brand: Wheaton ), ( Manufacturer Part Number: 240680 ), ( Part Type: Cap Screw ), ( Unit Type: Unit ), ( Cap Material: Phenolic ), ( Body Color: Black ), ( Closure Type: Screw On ), ( Screw Closure Size: 33 Mm To 430 Mm ), ( Country Of Origin: United States )

Review WHEATON Phenolic Cap 33-430mm Labware Screw Closure Size Pack Of 100

The **Wheaton 240680 Phenolic Cap, 33-430 Labware Screw Pack** is a high-quality, precision-engineered closure designed to provide an airtight, secure seal for Wheaton s durable 33-430 series glassware, including beakers, flasks, and other laboratory containers. Crafted from **phenolic resin**, a robust and chemically resistant material, this cap offers exceptional durability while maintaining clarity, allowing users to easily monitor contents without compromising sterility. The screw-threaded design ensures a tight, leak-proof fit, making it ideal for applications requiring containment of volatile solvents, corrosive reagents, or sensitive samples where spillage or contamination must be avoided. Its smooth, non-abrasive interior prevents damage to glass surfaces, extending the lifespan of both the cap and the labware, while the reinforced structure resists warping or deformation under pressure. The cap s ergonomic grip and balanced weight make it comfortable to handle, even during prolonged use, while its standardized dimensions ensure compatibility with the full range of Wheaton s 33-430 series glassware, including beakers, Erlenmeyer flasks, and other cylindrical containers. Whether used in analytical chemistry, pharmaceutical testing, or general laboratory procedures, this cap delivers reliability, precision, and ease of use, reinforcing Wheaton s reputation for superior labware accessories that meet the demands of modern scientific research.

**Pros and Cons of buying a Wheaton 240680 Phenolic Cap (33-430 Labware Screw Pack)**

1. **Material Quality:** The phenolic resin used in these caps is durable, resistant to many chemicals, and provides a good seal, which is essential for maintaining sample integrity in laboratory settings. Phenolic materials are also less prone to warping compared to some plastics.

2. **Compatibility:** These caps are designed specifically for Wheaton 33-430 glass bottles, ensuring a secure and leak-proof fit. This compatibility reduces the risk of contamination or spills, which is critical in laboratory environments.

3. **Reusability:** Phenolic caps are generally reusable, which can save money in the long run, especially for labs that frequently use the same containers.

4. **Chemical Resistance:** Phenolic materials are resistant to a wide range of organic solvents, acids, and bases, making these caps suitable for many laboratory applications, including storage of reagents, samples, or standards.

5. **Standardized Design:** The screw-on design is a common and user-friendly closure method, making it easy to open and close without specialized tools. This can improve workflow efficiency.

6. **Cost-Effective for Bulk Use:** While the initial cost per cap may seem moderate, purchasing in bulk (as this pack suggests) can offer better value for labs that require large quantities of caps.

7. **Compatibility with Autoclaving:** Phenolic materials can often withstand autoclaving (sterilization), though it s important to confirm this with the manufacturer, as prolonged exposure to high heat may degrade some plastics over time.

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1. **Limited Chemical Resistance:** While phenolic materials are resistant to many chemicals, they may not be suitable for all solvents, especially highly polar or oxidizing agents. Always verify compatibility with the specific chemicals you plan to store.

2. **Potential for Staining or Odor:** Phenolic materials can sometimes absorb odors or stains from certain chemicals, which may affect the purity of stored samples or reagents. This could be a concern in sensitive applications like pharmaceutical or biological research.

3. **Durability Concerns:** Although phenolic caps are durable, they may not be as robust as metal or certain high-grade plastics. Over time, repeated use or improper handling (e.g., excessive force when screwing on) could lead to cracks or deformation.

4. **Weight:** Phenolic caps are heavier than some plastic alternatives, which might make them less convenient for labs handling large volumes of samples or for applications requiring lightweight containers.

5. **Limited Temperature Range:** While phenolic materials can handle moderate temperatures, extreme heat or cold (e.g., freezing) may cause warping or brittleness. This could limit their use in certain storage conditions.

6. **Potential for Leaks Over Time:** Even with a secure fit, prolonged use or exposure to aggressive chemicals might compromise the seal, leading to leaks. Regular inspection is recommended.

7. **Environmental Considerations:** Phenolic plastics are not biodegradable and may pose disposal challenges. Labs must adhere to local regulations for waste disposal, which could add complexity.

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The Wheaton 240680 phenolic cap is a practical choice for many laboratory applications, particularly when working with Wheaton 33-430 bottles and storing a wide range of non-aggressive chemicals. Its durability, chemical resistance, and standardized design make it a reliable option for routine use. However, its limitations such as potential staining, weight, and compatibility issues with certain chemicals must be carefully considered before purchasing. If your lab frequently handles highly reactive or polar solvents, or if you require extreme temperature resistance, alternative materials like PTFE-lined caps or metal closures might be more suitable.

- You are using Wheaton 33-430 bottles exclusively.

- Your stored chemicals are compatible with phenolic materials (verify with the manufacturer or safety data sheets).

- You prioritize durability, reusability, and a secure seal for general laboratory use.

- You plan to buy in bulk, as this can offset the per-unit cost.

- You work with highly aggressive or polar solvents that may degrade phenolic materials.

- Your applications require extreme temperature resistance or lightweight containers.

- Staining or odor absorption is a concern for your specific samples.

Always test a small batch of caps with your intended chemicals before committing to a larger purchase to ensure compatibility.

Details:

Diameter: 33mm. Closure Size: 33-430mm. Closure Color: Black. Closure Material: Phenolic.

Closure Type: Screw On. Listing is for 1 unit of WHEATON 240680 Phenolic Cap, 33-430mm Labware Screw Closure Size, Pack 1 Grainier 49WE71, Ships same/next day via UPS / FedEx: Screw-On Cap. : Yes. Closure Liner Material: Butyl.

Closure Liner Design: Open Top.

part #: 240680 prices

• $30.00-$250.00

specifications plasticwarelabsuppy:

• brand: Wheaton
• mpn: 240680
• part type: Cap Screw
• unit type: Unit
• cap material: Phenolic
• body color: Black
• closure type: Screw On
• screw closure size: 33 Mm To 430 Mm
• country of origin: United States

general plasticwarelabsuppy:

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

returns plasticwarelabsuppy:

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

seller plasticwarelabsuppy:

• # reviews: 1742
• city: Charlotte, North Carolina
• rating: 100.0%

offer plasticwarelabsuppy:

• started: February 16, 2026
• options: Ship-to-home
• quantity: 10
• sold: 0
• availability: In Stock

payments plasticwarelabsuppy:

• credit card: Diners-club
• other
• wallet: Paypal

shipping plasticwarelabsuppy:

• class: Standard
• type: Fixed
• carrier: UPS
• service: UPS Ground
• transit: 3-7 Days
• cost: $0.00

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