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  3. KONTES K-85010

KONTES K-85010 Pennyhead Stopper Lab Glass

K-85010 Kontes Lot 5 Size 13 Pennyhead Stopper - Lab Glass

( Brand: Kontes ), ( Manufacturer Part Number: K-85010 ), ( Part Type: Stopper ), ( Country Of Origin: United States )

Review KONTES Lot Size Pennyhead Stopper Lab Glass

The **Kontes K-85010 13 Pennyhead Stopper** is a precision-engineered laboratory glass stopper designed for reliability, durability, and seamless compatibility with standard laboratory glassware. Crafted from high-quality borosilicate glass, this stopper is engineered to withstand extreme temperature fluctuations, chemical resistance, and repeated sterilization cycles, making it an indispensable component in academic, industrial, and clinical research settings. The distinctive **13 pennyhead** design referring to its diameter, which aligns with the size of a U.S. penny s head ensures a snug, airtight seal when fitted into conical or cylindrical glassware, such as reagent bottles, volumetric flasks, or separatory funnels. Its smooth, polished surface minimizes friction during insertion and removal, reducing the risk of breakage or contamination, while the slightly tapered design allows for effortless threading into narrow-mouthed containers. The stopper s transparency enables visual confirmation of liquid levels or residue without disturbing the contents, a critical feature in experiments requiring precision measurements or prolonged storage. Additionally, the borosilicate glass composition known for its low thermal expansion coefficient prevents warping or cracking under thermal shock, whether exposed to boiling solvents, cryogenic conditions, or autoclave sterilization. Whether used in routine chemical synthesis, microbiological culturing, or analytical procedures, this stopper exemplifies Kontes commitment to quality, offering researchers a dependable barrier against evaporation, contamination, and spillage. Its compatibility with standard laboratory protocols and its long-term reliability make it a staple in any well-equipped lab, where consistency and performance are paramount.

### Pros and Cons of buying a Kontes K-85010 13 Pennyhead Stopper Lab Glass

#### **Pros:**

The Kontes K-85010 13 Pennyhead Stopper is a high-quality laboratory glassware component designed for precision and durability, making it a reliable choice for many lab applications.

1. **Precision Fit and Compatibility**

The stopper is designed to fit tightly into standard laboratory glassware, such as Erlenmeyer flasks, beakers, or reagent bottles, ensuring a secure seal. This minimizes evaporation and contamination risks, which is critical in experiments requiring accurate measurements or sensitive reactions.

2. **Durability and Chemical Resistance**

Kontes products are known for their high-quality borosilicate glass, which is resistant to thermal shock and most common laboratory chemicals. This makes the stopper suitable for a wide range of applications, including heating, cooling, and exposure to organic solvents, acids, or bases.

3. **Sterilization and Reusability**

Borosilicate glass can withstand autoclaving and other sterilization methods, making this stopper reusable and cost-effective over time. This is particularly advantageous in research labs or educational settings where disposables are impractical.

4. **Compatibility with Standard Laboratory Equipment**

The 13 pennyhead size is a common standard in laboratory glassware, meaning it is widely compatible with existing setups. This reduces the need for specialized adapters or custom fittings, simplifying inventory management.

5. **Long-Term Reliability**

Kontes is a trusted brand in the scientific community, known for producing durable and consistent glassware. The stopper s design minimizes wear over time, reducing the frequency of replacements and potential disruptions in workflow.

6. **Versatility**

The stopper can be used in various applications, including:

- Sealing flasks during titrations or reactions.

- Covering containers to prevent contamination or evaporation.

- Acting as a simple closure for storage of reagents or samples.

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#### **Cons:**

While the Kontes K-85010 13 Pennyhead Stopper is a robust product, there are some potential drawbacks to consider before purchasing.

1. **Cost**

High-quality borosilicate glassware, including Kontes products, tends to be more expensive than disposable or lower-grade alternatives. For labs with tight budgets or infrequent use, the upfront cost may be a significant consideration.

2. **Fragility Despite Durability**

Although borosilicate glass is more resistant to thermal shock than soda-lime glass, it is not indestructible. Dropping the stopper or subjecting it to extreme force can still cause it to break, leading to potential glass contamination or injury. This requires careful handling and storage.

3. **Limited Flexibility in Size**

The 13 pennyhead size is standard but may not fit all laboratory glassware, especially non-standard or older equipment. Purchasing multiple sizes or adapters may be necessary, adding to the overall cost.

4. **Maintenance and Cleaning**

While borosilicate glass is easy to clean, improper cleaning methods (e.g., abrasive scrubbers or harsh chemicals) can scratch or damage the stopper over time. This requires adherence to proper lab cleaning protocols to maintain its integrity.

5. **Potential for Contamination**

If the stopper is not cleaned thoroughly or is reused improperly (e.g., without drying completely), it can harbor residues from previous experiments. This risk must be managed through rigorous cleaning and drying procedures.

6. **Availability and Lead Times**

Kontes products may not always be in stock at local suppliers, and lead times for ordering can vary. This could cause delays in lab operations if the stopper is needed urgently.

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### **Conclusion:**

The Kontes K-85010 13 Pennyhead Stopper is an excellent investment for laboratories prioritizing precision, durability, and chemical resistance. Its compatibility with standard glassware, reusability, and reliability make it a valuable tool for research, education, and routine lab work. However, the higher cost, potential fragility, and need for careful maintenance may pose challenges depending on the lab s budget, workflow, and usage patterns.

### **Recommendation:** **Buy the Kontes K-85010 13 Pennyhead Stopper if:**

- Your lab requires high-quality, reusable glassware for experiments involving chemicals, heating, or precise measurements.

- You have a need for a standard-sized stopper that fits common laboratory glassware.

- Budget constraints allow for the initial investment, as the long-term benefits outweigh the cost.

- Proper handling and cleaning protocols are in place to ensure durability and minimize contamination risks.

**Avoid or consider alternatives if:**

- Your lab operates on a very tight budget and disposable stoppers or lower-grade glassware are sufficient for your needs.

- You frequently work with non-standard glassware that may not accommodate the 13 pennyhead size.

- The risk of accidental breakage or mishandling is high, and you cannot justify the cost of replacements.

- You require a large quantity of stoppers and can find a more cost-effective brand with comparable quality.

For most professional or academic laboratories, the Kontes K-85010 is a worthwhile purchase due to its reliability and performance. However, always evaluate your specific needs and budget before making a decision.

Details:

You get 5 brand new stoppers.

part #: k85010 price

  • $10.00

specifications plasticwarelabsuppy:

  • brand: Kontes
  • mpn: K-85010
  • part type: Stopper
  • country of origin: United States

shipping plasticwarelabsuppy:

  • transit: 4-9 Days
  • type: Calculated
  • service: USPS Ground Advantage
  • carrier: USPS
  • cost: $5.95
  • class: Standard

general plasticwarelabsuppy:

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

offer plasticwarelabsuppy:

  • sold: 0
  • options: Ship-to-home
  • quantity: 6
  • started: March 26, 2026
  • availability: In Stock

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  • other
  • credit card: Discover
  • wallet: Paypal

seller plasticwarelabsuppy:

  • rating: 99.8%
  • # reviews: 2765
  • city: Cheney, Washington

returns plasticwarelabsuppy:

  • paid by: Seller
  • policy: Returns Accepted
  • method: Money back
  • time: 30 Days
part type: stopper, country of origin: united states,
category: business & industrial > medical, lab dental supplies > glassware plasticware > medical lab glassware, sku: 13541105316961731,
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  • New. Offer #1 priced at $10.00 + $6.89 shipping estimate = $16.89* total. You get 5 brand new stoppers.+$6.89 shipping

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