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  3. CHEMGLASS CG-1321-12

CHEMGLASS CG-1321-12 Bump Trap Rotary Evaporator 250ML 24/40 29/42

Cg-1321-12 Chemglass 250ml Bump Trap Rotary Evaporator Modified 24/40 29/42

( Brand: Chemglass ), ( Manufacturer Part Number: CG-1321-12 ), ( Part Type: Trap )

Review CHEMGLASS 250ml Bump Trap Rotary Evaporator Modified 24/40 29/42

The **Chemglass CG-1321-12 250 mL Bump Trap Rotary Evaporator Adapter** is a precision-engineered accessory designed to enhance the efficiency and safety of solvent evaporation processes in laboratory settings. Specifically crafted for use with rotary evaporators featuring **24/40 male standard taper (MS) and 29/42 female standard taper (FS) joints**, this bump trap adapter is tailored to accommodate a **250 mL round-bottom flask** while maintaining optimal functionality. Constructed from high-quality **borosilicate glass (Type 1, Class A)**, the CG-1321-12 ensures exceptional chemical resistance, thermal stability, and durability, making it ideal for applications involving aggressive solvents, elevated temperatures, and repeated use. The bump trap mechanism itself is a critical feature, designed to prevent the formation of bubbles and "bumping" during evaporation a common issue that can lead to solvent loss, contamination, or even equipment damage. By incorporating a **smooth, tapered internal design**, the adapter minimizes turbulence and promotes a controlled, even evaporation process, thereby preserving the integrity of heat-sensitive compounds. The **24/40 MS joint** on one end allows seamless connection to the rotary evaporator s main body or condenser, while the **29/42 FS joint** on the other end securely interfaces with the flask, ensuring an airtight seal that prevents solvent vapors from escaping. This adapter is particularly well-suited for applications in organic synthesis, pharmaceutical development, natural product isolation, and analytical chemistry, where precise solvent removal is essential. Its compatibility with standard rotary evaporator setups such as those from Buchi, Heidolph, or IKA makes it a versatile addition to any laboratory workflow. Whether used in routine solvent evaporation or complex multi-step syntheses, the Chemglass CG-1321-12 delivers reliability, precision, and ease of use, helping researchers achieve consistent and reproducible results with confidence.

**Pros and Cons of buying a Chemglass CG-1321-12 250ml Bump Trap Rotary Evaporator (24/40/29/42 Joints)**

### **Pros**

1. **Durability and Quality Construction**

The Chemglass CG-1321-12 is known for its robust glass construction, designed to withstand repeated use in laboratory settings. Chemglass is a reputable manufacturer with a history of producing reliable glassware, reducing the risk of leaks or breakage during operation.

2. **Versatility in Applications**

This rotary evaporator is suitable for a wide range of laboratory tasks, including solvent evaporation, concentration of solutions, and sample preparation in organic synthesis, biochemistry, and pharmaceutical research. The 250ml capacity is ideal for moderate-scale operations without being overly large or cumbersome.

3. **Bump Trap Design**

The built-in bump trap helps prevent bumping during evaporation, which can cause loss of sample or damage to the system. This feature is particularly useful when working with heat-sensitive or volatile compounds.

4. **Compatibility with Standard Joints**

The 24/40 and 29/42 joint compatibility ensures that this evaporator can be easily integrated with other glassware, such as condensers, receiving flasks, and adapters, without the need for additional adapters in most cases. This flexibility simplifies setup and maintenance.

5. **Ease of Cleaning and Maintenance**

Glass components are generally easier to clean than metal parts, especially when dealing with residues from organic solvents or biological samples. The smooth surfaces of Chemglass products reduce the likelihood of trapping contaminants.

6. **Safety Features**

Rotary evaporators are inherently safer than open-flask evaporation methods because they reduce exposure to volatile solvents. The bump trap further enhances safety by minimizing the risk of sample loss due to sudden boiling.

7. **Compatibility with Common Rotary Evaporator Systems**

This model is designed to work with standard rotary evaporator setups, including those from brands like B chi, Heidolph, or IKA. It can be paired with a variety of water baths, vacuum pumps, and condensers, making it a practical addition to existing lab equipment.

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### **Cons**

1. **Limited Capacity for Large-Scale Operations**

The 250ml capacity may be insufficient for large-scale extractions or processes requiring higher volumes. Researchers working on a bigger scale may need to perform multiple runs or invest in a larger model.

2. **Glassware Fragility**

While durable, glass components can still break if mishandled, especially during assembly, disassembly, or transport. This requires careful handling and potentially additional protective measures, such as using protective sleeves or cases.

3. **Cost Relative to Alternative Materials**

High-quality glassware like Chemglass is generally more expensive than plastic or metal alternatives. For labs with tight budgets, this may be a significant consideration, though the long-term durability often justifies the investment.

4. **Requires Proper Vacuum and Cooling Systems**

This unit is not a standalone evaporator; it must be paired with a vacuum pump, water supply for the condenser, and a heating bath (e.g., water bath or oil bath). The cost and maintenance of these additional components should be factored into the overall budget.

5. **Potential for Condenser Fouling**

Over time, condensers can become fouled with solvent residues or impurities, reducing efficiency. Regular cleaning is necessary to maintain optimal performance, which can be time-consuming.

6. **Limited Customization**

Unlike some metal rotary evaporators, glass models like this one offer limited options for customization (e.g., joint sizes, additional ports). Users must work within the constraints of the standard design.

7. **Space Requirements**

Rotary evaporators, including this model, occupy significant bench space. Labs with limited workspace may find it challenging to accommodate the equipment along with associated accessories.

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### **Conclusion**

The Chemglass CG-1321-12 250ml bump trap rotary evaporator is a well-engineered, reliable, and versatile piece of laboratory equipment. Its durability, safety features, and compatibility with standard lab setups make it a strong choice for researchers performing moderate-scale solvent evaporation tasks. The bump trap is particularly valuable for preventing sample loss, while the glass construction ensures clarity and ease of cleaning.

However, the limitations in capacity, fragility, and the need for complementary systems (vacuum pump, condenser, heating bath) should be carefully considered. For labs with sufficient space and budget, this evaporator offers excellent performance and longevity. For those working on a smaller scale or with limited resources, alternative models (e.g., smaller capacity or plastic alternatives) might be more suitable.

### **Recommendation**

If your laboratory requires a reliable, mid-range rotary evaporator for tasks such as solvent evaporation, sample concentration, or organic synthesis, the **Chemglass CG-1321-12 is an excellent choice**. It strikes a balance between capacity, safety, and durability, making it ideal for academic, research, or industrial labs with moderate demands.

**Consider purchasing this model if:**

- You need a 250ml capacity for routine evaporation tasks.

- You prioritize glass durability and ease of cleaning.

- Your lab already has compatible vacuum and cooling systems.

- You value the bump trap feature to minimize sample loss.

**Avoid this model if:**

- You require a larger capacity (e.g., 1L or more) for high-volume operations.

- Your budget is extremely limited, and you can opt for a lower-cost alternative.

- Your lab lacks proper storage or handling protocols for fragile glassware.

For best results, pair this evaporator with a reputable brand s rotary evaporator system (e.g., B chi B-490) and ensure proper training for safe operation. Regular maintenance, such as cleaning the condenser and checking seals, will extend its lifespan and performance.

Details:

If a custom power cord or AC adapter is required for the item, it only included if pictured described above. Cosmetically in good condition showing minor scuffs / scratches blemishes from previous use. Privacy: Rest assured your information will not be given, sold, rented or loaned to any third party. Shipping Details: originates from zip code 95742.

Item will come with a 30 Day Warranty. Item was recently removed from working service and is in excellent order. Pictures are of one the actual units available. Includes Chemglass CG-1321-12 250mL Bump Trap, Rotary Evaporator, Modified, 24/40 Top Outer, 29/42 Lower Inner as pictured.

part #: cg132112 prices

  • $99.99-$115.00

specifications plasticwarelabsuppy:

  • brand: Chemglass
  • mpn: Cg-1321-12
  • part type: Trap

offer plasticwarelabsuppy:

  • started: June 11, 2026
  • quantity: 4
  • sold: 0
  • availability: In Stock
  • options: Ship-to-home

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  • city: Rancho Cordova, California
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general plasticwarelabsuppy:

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

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part type: trap,
category: business & industrial > medical, lab dental supplies > glassware plasticware > medical lab glassware, sku: 14063840254199751,
Chemglass CG-1321-12 Is Similar To:
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2 offers $99.99–$115.00 USD
  • Used. Offer #1 priced at $99.99 + $0.00 shipping estimate = $99.99* total. . Item was recently removed from working service and is in excellent working order.FREE SHIPPING
  • New. Offer #2 priced at $115.00 + $12.83 shipping estimate = $127.83* total. Cg132112 Brand new Evaporator Bump Traps Similar to CG-1320, but with the addition of two 4mm drain holes at the base of the inner tube to allow solvent to drain back into the evaporation flask.+$12.83 shipping

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