STONYLAB Borosilicate Glass Wall Separatory SEP-FUNNEL-24/40-1PK-250ML Funnel

( Brand: Stonylab ), ( Manufacturer Part Number: SEP-FUNNEL-24/40-1PK-250ML ), ( Part Type: Wall ), ( Intended Use/discipline: Biological Laboratory, Medical Laboratory )

Review STONYLAB Sep-funnel-24/40-1pk-250ml Borosilicate Glass 250 Ml Heavy Wall Conical Separatory Funnel

The **StonyLab SEP-Funnel 24/40-1PK-250 Borosilicate Glass Separatory Funnel** is a precision-engineered laboratory tool designed for efficient and reliable liquid-liquid extractions, offering both durability and functionality in demanding chemical and analytical workflows. Crafted from **Type I borosilicate glass (DIN 12111, ISO 3585)**, this funnel is engineered to withstand extreme thermal and chemical stresses, ensuring long-term stability even when exposed to aggressive solvents, acids, or bases. The **250 mL capacity** provides ample volume for medium-scale separations, making it ideal for routine laboratory procedures such as solvent extraction, phase separation, or sample preparation in fields like organic synthesis, pharmaceutical analysis, or environmental testing. The **24/40 standard taper joint** ensures a secure, leak-proof connection to compatible glassware, including Erlenmeyer flasks, round-bottom flasks, or other standard laboratory glassware, while minimizing dead volume and maximizing efficiency during extraction processes.

The **wall-thickened design** of the funnel enhances structural integrity, reducing the risk of breakage during vigorous shaking or centrifugation, which is critical when working with dense or viscous liquids. The **smooth, polished interior surface** minimizes adsorption of organic compounds, ensuring accurate recovery of analytes and preserving the purity of extracted phases. Additionally, the **graduated markings** on the stem allow for precise volume measurements, facilitating consistent and reproducible results in titrations, back-extraction, or quantitative analyses. The **single-packaging unit (1PK)** ensures ease of handling and storage, while the **durable, clear borosilicate construction** allows for easy visualization of the separation process, enabling operators to monitor phase clarity and progress without interruption.

Beyond its technical specifications, this separatory funnel is a testament to modern laboratory design, blending **ergonomic functionality with scientific rigor**. Its **ergonomic stopcock mechanism** provides smooth, leak-free control over liquid flow, reducing operator fatigue during prolonged use. The **compatibility with standard laboratory accessories**, such as adapters or vacuum systems, further expands its versatility, making it suitable for both bench-top and slightly modified setups. Whether used in academic research, industrial quality control, or clinical diagnostics, the **StonyLab SEP-Funnel 24/40-1PK-250** delivers a reliable, high-performance solution for liquid-liquid separations, embodying the balance of precision, durability, and ease of use that modern laboratories demand.

**Pros and Cons of buying a Stonylab Sep-Funnel-24/40-1pk-250ml Borosilicate Glass Separatory Funnel**

1. **Durability and Chemical Resistance:** Borosilicate glass (Type I or III) is highly resistant to thermal shock and chemical corrosion, making it suitable for a wide range of laboratory applications, including organic synthesis, extractions, and titrations. It can withstand high temperatures and aggressive solvents without degrading.

2. **Precision and Clarity:** The clear glass allows for easy visualization of the separation process, which is critical in techniques like liquid-liquid extractions where monitoring phase separation is essential. The precision-ground joints (24/40 standard taper) ensure a tight, leak-proof seal when connected to other glassware.

3. **Compatibility with Standard Laboratory Equipment:** The 24/40 joint is a universal standard in glassware, meaning it can be used with adapters, stopcocks, or other compatible glassware (e.g., funnels, condensers, or collection flasks). This versatility makes it a practical choice for labs with existing setups.

4. **Single-Pack Convenience:** The package includes one funnel, which is ideal for individual users or small-scale applications where bulk purchases are unnecessary. It avoids overstocking while still providing a reliable tool.

5. **Cost-Effective for Basic Use:** Compared to high-end or specialized separatory funnels, this model offers a balance between affordability and functionality for routine laboratory tasks. It is a good entry-level option for students or hobbyists.

6. **Easy to Clean and Maintain:** Borosilicate glass is non-porous and can be cleaned thoroughly with solvents, detergents, or even mild acid solutions. It does not retain odors or residues like some plastics might.

7. **Safety:** Glass is inert and does not leach contaminants into samples, which is important for analytical or pharmaceutical applications where purity is critical.

---

1. **Fragility:** Despite its durability, borosilicate glass is still brittle and can shatter if dropped or subjected to sudden impacts. This poses a risk of injury or contamination if the glass breaks during use, especially in less controlled environments (e.g., home labs or fieldwork).

2. **Weight:** Glass funnels are heavier than plastic alternatives, which can make handling cumbersome during prolonged use or when working with large volumes. This may lead to fatigue or accidental spills if not handled carefully.

3. **Limited Temperature Range for Some Plastics:** While borosilicate glass excels at high temperatures, some users might prefer plastic funnels for very low-temperature applications (e.g., cryogenic work), though borosilicate can typically handle most standard lab conditions.

4. **Cost Relative to Plastic:** For very large-scale or disposable applications, plastic separatory funnels may be cheaper, though they lack the chemical resistance and clarity of glass. The upfront cost of borosilicate glass may not justify its use for one-time or low-frequency tasks.

5. **Maintenance of Joints:** The 24/40 joint requires periodic cleaning to prevent residue buildup, which can affect the seal over time. If not maintained, leaks may occur, compromising the integrity of the separation process.

6. **Space Requirements:** Glassware takes up more storage space than plastic, which can be a consideration in labs with limited bench space or for users who frequently move between locations.

7. **Potential for Contamination from Improper Handling:** If the glass is not cleaned thoroughly between uses or if it is scratched (e.g., by abrasive materials), it may introduce particles or residues into samples, affecting results.

---

The Stonylab Sep-Funnel-24/40-1pk-250ml borosilicate glass separatory funnel is a robust and reliable tool for laboratory applications that demand chemical resistance, clarity, and precision. Its durability and compatibility with standard glassware make it a strong choice for organic synthesis, extractions, and other routine procedures. However, its fragility, weight, and higher cost relative to plastic alternatives may limit its suitability for certain users, such as those working in high-volume or disposable settings or in environments where safety risks (e.g., accidental drops) are a concern.

For most academic, research, or small-scale industrial labs, the benefits of borosilicate glass particularly its chemical inertness and clarity outweigh its drawbacks. It is an excellent investment for users who prioritize quality and longevity in their laboratory equipment.

- You work in a laboratory setting where chemical resistance and precision are critical (e.g., organic chemistry, pharmacology, or analytical labs).

- You frequently use standard glassware and need compatibility with adapters or other 24/40 joint equipment.

- You prioritize durability and clarity over convenience or cost for occasional use.

- You are willing to handle the glass carefully to avoid breakage and maintain its performance.

- You require disposable or lightweight funnels for large-scale or high-frequency use (e.g., industrial or field applications).

- Your budget is extremely limited, and you can find a plastic alternative that meets your needs without sacrificing safety.

- You work in an environment where the risk of dropping or mishandling glassware is high (e.g., mobile labs or informal setups).

- You need funnels for very low-temperature applications where plastic might be more practical.

For most users in traditional lab settings, this separatory funnel is a worthwhile purchase due to its reliability and performance. If in doubt, test it with a small-scale extraction or titration to ensure it meets your specific requirements.

Details:

The StonyLab Borosilicate Glass 250 ml Heavy Wall Conical Separatory Funnel is a high-quality piece of glassware designed for use in medical and biological laboratories. Its conical shape and heavy wall construction make it ideal for separating collecting liquids in a precise controlled manner. Funnel with 24/29 Joints and PTFE Stopcock, 250 ml. The durable borosilicate glass material ensures long-lasting performance and resistance to thermal shock, making it a reliable tool for various laboratory applications.

part #: sep-funnel-24 prices

• $30.00-$94.76

specifications plasticwarelabsuppy:

• brand: Stonylab
• mpn: Sep-funnel-24/40-1pk-250ml
• part type: Wall
• intended use/discipline: Biological Laboratory, Medical Laboratory

general plasticwarelabsuppy:

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

offer plasticwarelabsuppy:

• availability: In Stock
• quantity: 1
• sold: 0
• best offers: True
• options: Ship-to-home
• started: April 9, 2026

seller plasticwarelabsuppy:

• city: Thousand Oaks, California
• rating: 100.0%
• # reviews: 45

shipping plasticwarelabsuppy:

• cost: $11.92
• carrier: USPS
• class: Standard
• service: USPS Ground Advantage
• transit: 5-11 Days
• type: Fixed

payments plasticwarelabsuppy:

• other
• wallet: Google-pay
• credit card: Discover

returns plasticwarelabsuppy:

• policy: No Returns

Stonylab 40-1PK-250ML Is Similar To:

• 43234-1449 Stonylab Borosilicate Glass Heavy Wall Single Neck Recovery 695634787443 (49.7% similar) ...(June 3rd, 2019)
• Uk-testtube-d12-l75-glass-200pk Stonylab Pack Borosilicate Glass Round Bottom Test Tube 696563770544 (34.3% similar) The test tube is made of borosilicate glass with a rounded cylindrical bottom, and appropriate wall thickness. Measures 12MM OD by 75MM length . Measures 12MM OD by 75MM length test tube is made of borosilicate glass feature cylindrical bottom flared top lip Stonylab 200 pack round tube...(December 11th, 2018)
• Us-allihn-condenser-24-40-glass-300mm Stonylab Borosilicate Glass Allihn Condenser With Joint Jacket 692619301588 (35.1% similar) Stonylab borosilicate glass align condenser with joint 300MM jacket length lab...(May 30th, 2019)
• Us-graham-condenser-24-40-glass-200mm Stonylab Borosilicate Glass Graham Condenser With Joint Jacket 691198389789 (35.1% similar) Stonylab borosilicate glass graham condenser with joint lab condenser - on the top and bottom made of high quality mm in jacket length warranty if received damaged, please immediately. Stonylab borosilicate glass graham condenser with joint 200MM jacket lab...(May 27th, 2019)
• Stonylab Scientific B08n4tm7dk Glass Vacuum Cold Trap Bubbler With 10mm Serrated Hose 225mm Length Below (35.6% similar) Borosilicate glass, heavy duty design, reusable and high quality. Glass vacuum cold trap bubblier with 10MM serrated hose, 225MM length below:: item model number B08N4TM7DK, manufacturer Stonylab scientific, package dimensions 12.64 x 6.5 3.03 inches; 13.76 ounces, size 225MM...(September 19th, 2023)
• Stonylab 696598344970 Glass Vacuum Cold Trap Bubbler With 10mm Serrated Hose 200mm Length (32.1% similar) Stonylab glass vacuum cold trap bubblier with 10MM serrated hose 200MM length...(September 27th, 2023)
• Stonylab 843798141957 Glass Chromatography Column Borosilicate 24 40 Joint (38.4% similar) Stonylab glass chromatography column, borosilicate 24/40 joint column with gritted disc and PDF stopcock, 300MM effective length 50MM.D. 24/40 standard taper top outer joint. B damage caused by natural disasters, flood fire, lightning or pollution. Made by hand-blowing to ensure achieving the ...(October 1st, 2023)
• Stonylab 788400970719 Glass Vacuum Cold Trap Bubbler With 10mm Serrated Hose 200mm Length (33.2% similar) Stonylab glass vacuum cold trap bubblier with 10MM serrated hose, 200MM length below the 24/40 joint: vacuum trap. Borosilicate glass, heavy duty design, reusable and high quality...(October 31st, 2023)
• Stonylab 788400970580 Glass Penny Head Hollow Stopper For 19 22 Outer Joint With Closed (40% similar) 24/40 JOINT;19/22 JOINT;14/20 joint penny-head stopper hollow glass borosilicate glass, heavy duty design, reusable high quality. Features: 19/22 joint. If you did not receive our reply. We reply every message within 24 hours. Borosilicate glass, heavy duty design, reusable and high quality...(December 31st, 2023)
• Stonylab 426844814635 Borosilicate Glass Graham Condenser With 24 40 Joint 500mm Jacket Length Lab (41.8% similar) Graham condenser is used for distillation and reflex apparatus, working with flasks bent adapters to condense vapors liquid droplet's...(September 26th, 2024)
• Stonylab 843798171589 Glass Straight Drying Tube Borosilicate Adapter With 14 20 (38.2% similar) Borosilicate glass, heavy duty and reusable; maximum withstand temperature 200 straight drying tube...(September 27th, 2024)