CHEMGLASS CG-4531-01 Dewar Flask Vacuum Trap 500ML 360X105MM 1900ML

( Brand: Chemglass ), ( Manufacturer Part Number: CG-4531-01 ), ( Part Type: Vacuum Trap ), ( Intended Use/discipline: Biological Laboratory ), ( Unit Type: Unit ), ( Country Of Origin: United States ), ( Additional Information: Surplus Laboratory Consumable Supplies )

Review CHEMGLASS 500ml 360x105mm Fit 1900ml Dewar Flask Vacuum Trap Complete

The **Chemglass CG-4531-01 500 mL Vacuum Trap Dewar Flask** is a precision-engineered laboratory vessel designed for high-performance applications in vacuum distillation, solvent recovery, and low-temperature cryogenic processes. Constructed from borosilicate glass (Type 3.3) with a wall thickness optimized for durability and thermal resistance, this flask combines the efficiency of a standard Dewar flask with the specialized functionality of a vacuum trap, making it an indispensable tool for researchers and technicians working in fields such as organic synthesis, analytical chemistry, and materials science. Its **500 mL nominal capacity** provides ample volume for medium-scale operations while maintaining a compact footprint, with an outer diameter of **360 mm** and a height of **105 mm**, allowing it to nest neatly within standard laboratory setups. The **1900 mL total volume** when filled with liquid nitrogen or other cryogenic fluids underscores its efficiency in thermal insulation, ensuring prolonged cooling stability during extended experiments.

The flask s **vacuum trap design** is engineered to minimize contamination and maximize efficiency by creating a sealed, low-pressure environment that prevents backflow and vapor leakage. The **ground-glass joint (24/40 standard taper)** ensures a secure, leak-proof connection to vacuum systems, condensers, or other glassware, while the **double-walled construction** with a vacuum-sealed space between the inner and outer chambers provides superior thermal insulation, reducing heat transfer and maintaining precise temperature control. This feature is particularly advantageous in applications requiring cryogenic temperatures, such as the condensation of volatile solvents or the storage of sensitive reagents. The **borosilicate glass body** not only resists thermal shock but also offers chemical resistance to a wide range of solvents, acids, and bases, ensuring longevity and reliability under demanding conditions.

Beyond its functional versatility, the CG-4531-01 is crafted with attention to ergonomic and practical details. The **smooth, polished surface** facilitates easy cleaning and sterilization, while the **reinforced base** provides stability during handling and operation. Whether used in conjunction with a vacuum pump for solvent recovery, as part of a distillation apparatus, or as a cryogenic storage vessel, this Dewar flask delivers exceptional performance with minimal maintenance. Its compatibility with standard laboratory glassware and accessories further enhances its utility, making it a cost-effective and high-quality solution for laboratories seeking precision and efficiency in their vacuum and cryogenic applications.

**Pros and Cons of buying a Chemglass CG-4531-01 500 mL Dewar Flask Vacuum Trap**

### **Pros**

1. **High-Quality Construction** Chemglass products are known for their durability and precision engineering, often made from borosilicate glass (likely Type 3.3 or 1720), which resists thermal shock and chemical corrosion. This ensures long-term reliability in laboratory settings.

2. **Precision Dimensions** The specified dimensions (360 mm height 105 mm diameter) and volume (500 mL capacity, with a total dewar volume of 1900 mL when filled) are designed for specific applications, such as cryogenic trapping, distillation, or vacuum systems. The fit and function are optimized for compatibility with other Chemglass components.

3. **Compatibility with Vacuum Systems** Dewar flasks are ideal for maintaining low temperatures in vacuum environments, making this trap suitable for applications like freeze-drying, solvent recovery, or cryogenic distillation. The vacuum seal ensures minimal contamination and efficient trapping of volatile substances.

4. **Versatility** The dewar design allows for the insertion of inner traps (e.g., glass wool, glass beads, or cold fingers) to enhance trapping efficiency for gases or vapors. This adaptability makes it useful across various chemical processes.

5. **Brand Reputation** Chemglass is a trusted manufacturer in the laboratory glassware industry, offering consistent quality and technical support. Their products are widely used in academic, industrial, and research settings, ensuring reliability for critical applications.

6. **Safety and Chemical Resistance** Borosilicate glass is chemically inert and resistant to most acids, bases, and organic solvents, reducing the risk of contamination or degradation during experiments.

7. **Compatibility with Standard Lab Equipment** The design aligns with common laboratory setups, making it easy to integrate into existing apparatuses without requiring extensive modifications.

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### **Cons**

1. **Cost** High-quality glassware from Chemglass is often more expensive than generic or lower-grade alternatives. The price may be prohibitive for small labs, students, or budget-conscious users, especially if multiple units are needed.

2. **Fragility** While borosilicate glass is durable, it remains susceptible to thermal shock (rapid temperature changes) or mechanical stress (e.g., dropping). Improper handling can lead to breakage, which may be costly to replace.

3. **Maintenance and Cleaning** Glassware requires thorough cleaning after use, particularly if it has trapped residues of volatile or corrosive substances. Some compounds may be difficult to remove, necessitating specialized cleaning agents or ultrasonic baths.

4. **Limited Customization** The fixed dimensions and design may not suit all applications. Users with non-standard setups or specific requirements might need to source additional adapters or modify the flask, adding complexity.

5. **Weight and Bulk** Glass dewar flasks are heavy and bulky, which can be cumbersome to transport or store. This may pose logistical challenges in labs with limited space or frequent relocations of equipment.

6. **Potential for Leaks** If the vacuum seal is compromised (e.g., due to improper assembly or damaged ground joints), it can lead to inefficiencies in trapping or contamination of the system. Regular inspections are necessary to maintain performance.

7. **Learning Curve** Proper use of a dewar trap, especially in vacuum systems, requires familiarity with glassware assembly, vacuum techniques, and safety protocols. Inexperienced users may encounter difficulties during setup or operation.

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### **Conclusion**

The **Chemglass CG-4531-01 500 mL Dewar Flask Vacuum Trap** is a high-quality, versatile tool ideal for laboratories requiring precise, durable, and chemically resistant glassware for vacuum or cryogenic applications. Its advantages in terms of reliability, compatibility, and performance make it a strong choice for research, industrial, or academic settings where quality is paramount. However, the higher cost, potential fragility, and maintenance requirements may not justify its purchase for casual users, small-scale operations, or those with limited budgets.

### **Recommendation**

- You are working in a professional laboratory setting (e.g., research, pharmaceutical, or chemical engineering) where precision and durability are critical.

- Your application involves vacuum distillation, freeze-drying, or cryogenic trapping of volatile substances.

- You prioritize long-term reliability and compatibility with other Chemglass components.

- You have the budget to invest in high-quality glassware and can accommodate its maintenance needs.

- You are a student or work in a small lab with limited funds, as lower-cost alternatives (e.g., generic borosilicate glassware or plastic traps) may suffice.

- Your application does not require the specific dimensions or vacuum-sealing capabilities of a dewar flask.

- You lack experience with glassware assembly or vacuum systems, as improper use could lead to inefficiencies or safety hazards.

- You need a more portable or disposable solution (e.g., for fieldwork or temporary setups).

For most professional laboratories, the **Chemglass CG-4531-01** is a worthwhile investment due to its performance and longevity. However, weigh the cost against your specific needs to ensure it aligns with your operational requirements. If budget is a concern, explore used or refurbished options from reputable suppliers.

Details:

No chips or cracks throughout. See pictures for details. GSR veers 1730 GS 9.9.4 1730 Used item in great condition. #65 pinch clamp.

Complete set includes: Stopper top, trap body, Vito 40mm o-ring, and.S.

part #: cg453101 price

• $146.99

specifications plasticwarelabsuppy:

• brand: Chemglass
• mpn: Cg-4531-01
• part type: Vacuum Trap
• intended use/discipline: Biological Laboratory
• unit type: Unit
• country of origin: United States
• additional information: Surplus Laboratory Consumable Supplies

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• started: February 14, 2026
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