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  3. SYNTHWARE 31-501-347

SYNTHWARE 31-501-347 Pear Schlenk Flask Pfte Stopcock Ns St/ns 24/40 100ML

31-501-347 Synthware Pear-shaped Modified Schlenk Flask Pfte Stopcock St/ns 24/40 100ml

( Brand: Synthware ), ( Manufacturer Part Number: 31-501-347 ), ( Part Type: Stopcock ), ( Country Of Origin: United States )

Review SYNTHWARE Pear shaped Modified Schlenk Flask Pfte Stopcock St/ns 24/40 100ml

The **Synthware 31-501-347 Pear-Shaped Schlenk Flask with PTFE Stopcock (ST/NS, 24/40 Joint, 100 mL)** is a precision-engineered glassware essential for synthetic chemists, laboratory technicians, and researchers working in vacuum, distillation, or reaction setups requiring controlled gas flow and sealing. Crafted from borosilicate glass (Type 3.3), this flask combines durability with exceptional thermal resistance, making it ideal for applications involving high temperatures, corrosive reagents, or aggressive solvents. Its distinctive pear shape optimizes surface area for efficient heating and cooling, while the integrated **PTFE (polytetrafluoroethylene) stopcock** ensures reliable sealing and smooth, leak-proof operation under vacuum or positive pressure conditions. The **24/40 standard taper joint** guarantees a secure, reusable connection to other glassware components, such as adapters, condensers, or vacuum pumps, without compromising sterility or integrity. With a **100 mL capacity**, this flask strikes a balance between practicality and functionality, accommodating small-scale reactions, solvent evaporations, or distillation processes where precise control over headspace and gas exchange is critical. The **ST/NS (standard taper/non-standard) designation** indicates compatibility with both conventional and specialized glassware systems, enhancing its versatility in diverse laboratory environments. Whether used for Schlenk line operations, inert atmosphere manipulations, or routine synthetic procedures, this flask s robust construction and ergonomic design make it a cornerstone of modern chemical synthesis, ensuring reliability in demanding experimental workflows.

### **Pros and Cons of buying a Synthware 31-501-347 Pear-Shaped Schlenk Flask (PTFE Stopcock, ST/NS 24/40, 100 mL)**

#### **Pros:**

1. **Versatility in Laboratory Applications** Schlenk flasks are essential for vacuum distillation, solvent evaporation, and inert atmosphere reactions, making this flask suitable for organic synthesis, catalysis, and materials chemistry.

2. **PTFE Stopcock** The PTFE (polytetrafluoroethylene) stopcock provides a chemically resistant seal, reducing contamination risks from corrosive reagents or solvents. It also offers better durability compared to rubber or glass stopcocks.

3. **Standard Joint Compatibility (24/40 ST/NS)** The dual-standard joint (Schott-Taper/Normal Standard) ensures compatibility with a wide range of glassware, adapters, and vacuum systems, making it easier to integrate into existing setups.

4. **Durable Borosilicate Glass (Type 3.3 or Similar)** High-quality borosilicate glass resists thermal shock and chemical corrosion, ensuring longevity in demanding laboratory conditions.

5. **Pear-Shaped Design** The pear shape allows for efficient mixing and reduces dead volume, improving reaction yields and ease of handling during vacuum operations.

6. **100 mL Capacity** The size is practical for small-to-medium-scale reactions, making it ideal for teaching labs, research, and pilot-scale work without excessive material usage.

7. **Compatibility with Vacuum Systems** The stopcock enables precise control of vacuum pressure, which is critical for techniques like rotary evaporation, solvent removal, and Schlenk line operations.

8. **Easy to Clean and Maintain** The smooth glass surface and removable PTFE stopcock simplify cleaning and reduce the risk of residue buildup.

#### **Cons:**

1. **Cost** Compared to basic glassware, Schlenk flasks with PTFE stopcocks and high-quality joints may be more expensive, especially if purchased from specialized suppliers.

2. **Potential for PTFE Wear** Over time, the PTFE stopcock may wear out or degrade if exposed to high temperatures or abrasive solvents, requiring replacement.

3. **Fragility** Like all glassware, Schlenk flasks are prone to breakage if dropped or subjected to thermal shock (e.g., rapid heating/cooling).

4. **Limited to Glass Compatibility** While the 24/40 joint is standard, some older or non-standard lab setups may require additional adapters, adding complexity.

5. **Maintenance of Stopcock Mechanism** The PTFE stopcock may require periodic lubrication (with silicone grease or PTFE-compatible lubricants) to ensure smooth operation.

6. **Not Ideal for High-Pressure Applications** Schlenk flasks are designed for vacuum or atmospheric pressure work; they are not suitable for high-pressure reactions.

7. **Single-Use Stopcock (If Not High-Quality)** Some cheaper PTFE stopcocks may degrade quickly, necessitating frequent replacements and adding to long-term costs.

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### **Conclusion**

The **Synthware 31-501-347 pear-shaped Schlenk flask** is a high-quality, versatile tool for laboratories requiring precise vacuum control, inert atmosphere work, or solvent management. Its PTFE stopcock, standard joint compatibility, and durable construction make it a reliable choice for organic synthesis, teaching labs, and small-scale research. However, its cost, potential maintenance requirements, and fragility are factors to consider, particularly in high-throughput or budget-sensitive environments.

For **most academic, research, or industrial labs** performing routine Schlenk operations, this flask is a **strong recommendation** due to its balance of functionality, durability, and ease of use. If budget is a concern, alternatives like simpler glassware with rubber stopcocks may suffice for less demanding applications, but they lack the chemical resistance and precision of the PTFE version.

**Final Recommendation:**

Purchase this flask if you need a **reliable, chemically resistant, and versatile** Schlenk flask for vacuum or inert atmosphere work. Ensure proper handling to maximize its lifespan, and consider investing in a high-quality PTFE stopcock if replacements are anticipated. For cost-sensitive applications, weigh the trade-offs against less expensive alternatives.

Details:

Pear-Shaped Modified Schlenk Flask, PFTE Stopcock ST/NS 24/40 100ml Synthware, Catalog No. Please see images for condition and what is included. 31-501-347, Comes from a Midwest research university. No chips or cracks.

part #: 31501347 price

  • $49.95

specifications plasticwarelabsuppy:

  • brand: Synthware
  • mpn: 31-501-347
  • part type: Stopcock
  • country of origin: United States

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  • started: February 7, 2026
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  • condition: Used
  • Medical, Lab Dental Supplies > Glassware Plasticware > Other Medical Lab Glassware
part type: stopcock, country of origin: united states,
category: business & industrial > medical, lab dental supplies > glassware plasticware > medical lab glassware, sku: 13244640396326632,
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  • Used. Offer #1 priced at $49.95 + $14.10 shipping estimate = $64.05* total. PFTE Stopcock ST/NS 24/40 100ml. Pear-Shaped Modified Schlenk Flask.+$14.10 shipping

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