10 Best Borosilicate Round Bottom Flasks for Your Laboratory Needs

When you’re setting up your laboratory, the right tools can make all the difference. Borosilicate round bottom flasks are essential for a variety of experiments, thanks to their thermal resistance and durability. With so many options available, it can be tough to choose the best ones for your specific needs. Let’s explore some top contenders that might just fit the bill and enhance your lab efficiency.

Stonylab Spherical Joint Round Bottom Receiving Flask (500 ml)

If you’re looking for a reliable flask for your laboratory, the Stonylab Spherical Joint Round Bottom Receiving Flask (500 ml) is an excellent choice. This borosilicate glass flask is specifically designed for use with rotary evaporators, ensuring efficient solvent collection. Its 35/20 standard spherical joint guarantees secure connections, making your experiments smoother. Crafted from high borosilicate glass, it offers exceptional transparency and durability, perfect for continuous reuse. Plus, it comes with a 1-year limited warranty, so you’re covered in case of any damage upon arrival. This flask is essential for any lab that values quality and performance.

Best For: Laboratories that require a dependable flask for efficient solvent collection during rotary evaporation processes.

Pros:

• High-quality borosilicate glass provides exceptional transparency and durability for repeated use.
• Standard 35/20 spherical joint ensures secure connections for smooth operation.
• 1-year limited warranty offers peace of mind against potential damages upon arrival.

Cons:

• Limited to specific volume options (500 ml, 1000 ml, 2000 ml) which may not suit all needs.
• Fragility of glass could lead to breakage if not handled carefully.
• Designed primarily for rotary evaporators, limiting its versatility in other applications.

Stonylab Round Bottom Flask with 3 Straight Neck 24/40 Standard Joints (1000 ml)

The Stonylab Round Bottom Flask with its 3-neck design and 24/40 standard joints is an essential tool for any lab enthusiast or professional chemist. With a 1000 ml capacity, this flask provides ample space for mixing and conducting chemical reactions. Made from G3.3 borosilicate glass, it boasts high heat resistance and excellent chemical durability. Just remember to avoid heating beyond 450℃ and sudden temperature changes over 200℃ to prevent breakage. Perfect for various applications, including distillation and reflux, this flask is a valuable addition to both educational and professional laboratory environments. Get ready to elevate your experiments!

Best For: The Stonylab Round Bottom Flask is best for chemistry enthusiasts, educators, and professional chemists conducting experiments in laboratory settings.

Pros:

• High heat resistance allows for safe heating during experiments.
• G3.3 borosilicate glass ensures excellent chemical durability and low thermal expansion.
• 3-neck design provides versatility for various experimental setups, such as distillation and reflux.

Cons:

• Limited to heating below 450℃, which may restrict certain applications.
• Requires careful handling to avoid breakage from sudden temperature changes.
• Larger size may not be suitable for small-scale experiments or limited workspace.

Stonylab Kjeldahl Flask, Borosilicate Glass, 100 ml

For laboratories focused on nitrogen determination, the Stonylab Kjeldahl Flask stands out as an essential tool. With a capacity of 100 ml and made from heavy-duty borosilicate glass, it’s both durable and reliable. Its round bottom design and long neck make it ideal for use as an air condenser during the digestion stage, minimizing entrainment during distillation. Featuring a 24/40 standard taper outer joint, it guarantees compatibility with various setups. Plus, you get a 1-year limited warranty, and StonyLab’s commitment to excellent customer service means you can reach out for assistance whenever needed.

Best For: Laboratories focused on nitrogen determination that require a durable and reliable flask for their Kjeldahl process.

Pros:

• Made from heavy-duty borosilicate glass, ensuring durability and resistance to thermal shock.
• Designed with a round bottom and long neck, making it ideal for minimizing entrainment during distillation.
• Comes with a 1-year limited warranty and access to excellent customer service for support.

Cons:

• Limited to a 100 ml capacity, which may not be suitable for larger experiments.
• Requires careful handling due to the glass material, which can break if dropped.
• Compatibility is restricted to setups that use a 24/40 standard taper outer joint.

Labasics Round Bottom Flask, 100 ml, Borosilicate Glass, Transparent

Whether you’re a seasoned chemist or a student just starting out, the Labasics Round Bottom Flask, 100 ml, made from high-quality borosilicate glass, is an essential tool for your laboratory. Its single neck with a standard 24/40 joint and shorter neck design makes distillation easier. This flask boasts heavy wall construction for durability, plus it’s resistant to acids and alkalis, withstanding temperatures up to 250°C. You can confidently use it for mixing, storing chemicals, and conducting reactions. With positive customer feedback and a 1-year limited warranty, you’ll appreciate its quality and reliability in your experiments.

Best For: Both experienced chemists and students looking for a reliable flask for laboratory experiments.

Pros:

• Durable borosilicate glass construction ensures high resistance to thermal shock and chemical exposure.
• Short neck design enhances ease of use during distillation processes.
• Positive customer reviews highlight the quality and effective packaging of the product.

Cons:

• Limited capacity of 100 ml may not be sufficient for larger experiments or reactions.
• Requires careful handling to avoid breakage due to the glass material.
• The standard 24/40 joint may not be compatible with all laboratory setups, limiting versatility.

StonyLab Glass 250ml Short Neck Round Bottom Flask

Looking for a reliable and affordable option for your laboratory? The StonyLab Glass 250ml Short Neck Round Bottom Flask could be just what you need. Made from durable borosilicate glass, this flask features a single short neck with a 24/40 standard taper outer joint. Users generally report good performance, often comparing it favorably to Pyrex but at a lower price. While some minor blemishes or defects may occur, many find them functional. Just remember, avoid dropping the flask on hard surfaces, and be aware that it might not fit in standard mantles. It’s a solid choice for various laboratory applications.

Best For: Laboratory professionals and students looking for an affordable yet reliable glass flask for various applications.

Pros:

• Durable Construction: Made from high-quality borosilicate glass, ensuring resistance to thermal shock.
• Cost-Effective: Comparable quality to Pyrex but offered at a lower price point.
• Functional Design: Features a standard taper outer joint for versatile compatibility with lab equipment.

Cons:

• Quality Control Issues: Some users report minor blemishes, scratches, or chips on the flasks.
• Fit Limitations: May not fit in standard mantles due to size variations.
• Breakage Risk: Caution is advised as some have experienced breakage when heated to boiling point.

ULAB Boiling Flask Set (2pcs, 250ml, Borosilicate Glass)

The ULAB Boiling Flask Set, featuring two 250ml borosilicate glass flasks, is an excellent choice for laboratory professionals who demand durability and versatility in their equipment. Made from borosilicate 3.3 glass, these flasks offer exceptional chemical durability and shock resistance. Their round bottom and short neck design guarantees uniform heating, making them perfect for prolonged boiling. Beyond lab use, they’re great for wine decanting or as decorative vases. ULAB prioritizes customer satisfaction, offering quick responses to inquiries and replacements for damaged items. Overall, you’ll appreciate the quality and value these flasks bring to your laboratory or creative projects.

Best For: Laboratory professionals and individuals seeking durable and versatile glassware for both scientific and creative uses.

Pros:

• Excellent chemical durability and shock resistance due to borosilicate 3.3 glass.
• Uniform heating design suitable for prolonged boiling of liquids.
• Versatile for both laboratory applications and non-laboratory uses like wine decanting or decorative purposes.

Cons:

• Some users reported factory defects such as stress marks and bubbles in the glass.
• Packaging issues have led to breakage during transit for certain customers.
• Price increases after purchase may deter repeat buyers.

Labasics Round Bottom Flask with 4 Necks (500 ml)

For laboratory professionals engaged in complex chemical reactions, the Labasics Round Bottom Flask with 4 necks (500 ml) stands out as an ideal choice. Designed specifically for reflux setups and laboratory-scale synthesis, this flask features four 24/40 standard taper outer joints for versatile use. Made from durable borosilicate glass, it offers a smooth, bubble-free surface with high transparency. With a maximum temperature tolerance of 250°C, it withstands demanding conditions. Plus, its heavy-duty construction guarantees excellent pressure resistance, making it reusable. With a 1-year warranty and responsive customer service, Labasics prioritizes your satisfaction.

Best For: Laboratory professionals engaged in complex chemical reactions and synthesis who require durable and versatile glassware.

Pros:

• High-quality borosilicate glass ensures durability and resistance to high temperatures.
• Four neck design allows for versatile setups in reflux and synthesis processes.
• Heavy-duty construction provides excellent pressure resistance and reusability.

Cons:

• The 500 ml capacity may not be sufficient for larger experiments.
• Limited to a maximum temperature of 250°C, which may not suit all applications.
• Requires careful handling to avoid breakage, typical for glass products.

EISCO Boiling Flask, 100ml – Borosilicate Glass

Perfectly suited for laboratory professionals and enthusiasts alike, the EISCO Boiling Flask, with its 100ml capacity and durable borosilicate glass construction, guarantees reliable performance during boiling and similar tasks. Its round bottom design enhances stability, although it’s not meant for flat surfaces. You’ll appreciate its autoclavable and heat-resistant properties, able to withstand high temperatures and thermal shocks. With a top rack dishwasher-safe feature, cleanup is a breeze. Manufactured with high-quality standards by Eisco Labs, this flask supports your experiments while ensuring safety and durability. Pair it with a stand for ideal stability during use.

Best For: Laboratory professionals and enthusiasts seeking a reliable boiling flask for experiments.

Pros:

• High durability: Made from borosilicate glass, offering excellent resistance to thermal shocks and high temperatures.
• Easy to clean: Top rack dishwasher safe, making post-experiment cleanup convenient.
• Autoclavable: Suitable for sterilization, ensuring safe usage in laboratory settings.

Cons:

• Round bottom design: Not suitable for use on flat surfaces, which may limit versatility.
• Limited capacity: At 100ml, it may not be ideal for larger volume experiments.
• Requires a stand: For stability during use, a stand is recommended, which is sold separately.

CS Labglass 250ml Single Neck Round Bottom Flask (5 Pack)

Engineered for efficiency, the CS Labglass 250ml Single Neck Round Bottom Flask (5 Pack) is ideal for chemists seeking reliable and durable glassware for their experiments. Made from high-quality borosilicate glass, these flasks feature heavy walls for enhanced durability and a reusable design. The round bottom promotes uniform heating and efficient mixing, ensuring your reactions proceed smoothly. With a standard 24/40 taper outer joint, they fit seamlessly into most setups. Perfect for organic chemistry applications, these flasks are great for distillation and vacuum distillation. Investing in this pack guarantees you’ll have dependable tools for your laboratory needs.

Best For: Chemists and laboratory professionals seeking reliable and durable glassware for organic chemistry applications.

Pros:

• High-quality borosilicate glass ensures durability and resistance to thermal shock.
• Round bottom design facilitates uniform heating and efficient mixing of contents.
• Reusable design reduces waste and cost over time.

Cons:

• Fragility of glassware requires careful handling to avoid breakage.
• Limited volume of 250ml may not be suitable for larger experiments.
• Standard joint size may not fit all apparatus, requiring additional adapters in some setups.

XCD Borosilicate Glass Single Neck Round Bottom Boiling Flask (100 ml)

The XCD Borosilicate Glass Single Neck Round Bottom Boiling Flask (100 ml) is an excellent choice for laboratory professionals who require reliable glassware for distillation and chemical reactions. Made from heat-resistant borosilicate glass, this flask features a round bottom design, ensuring uniform heating and mixing during experiments. However, some users report mixed durability experiences, with occasional cracking after limited use. While cleaning can be a bit challenging, the overall quality garners positive feedback. If you encounter any issues, XCD offers customer support to assist with defective items. This flask is a solid option, but handle it with care.

Best For: Laboratory professionals seeking reliable glassware for distillation and chemical reactions.

Pros:

• High resistance to heat and chemical reactions due to borosilicate glass material.
• Round bottom design promotes uniform heating and mixing.
• Positive customer feedback on overall quality and effectiveness in boiling applications.

Cons:

• Mixed reviews on durability, with reports of cracking after limited use.
• Some users find cleaning more challenging compared to other lab glassware.
• Concerns about wall thickness, perceived as thinner than advertised.

Factors to Consider When Choosing a Borosilicate Round Bottom Flask

When you’re choosing a borosilicate round bottom flask, there are several key factors to keep in mind. Consider the flask’s capacity, joint type compatibility, and overall material quality. You’ll also want to assess temperature resistance levels and design features to guarantee it meets your specific laboratory needs.

Flask Capacity Options

Choosing the right capacity for your borosilicate round bottom flask can make a significant difference in the success of your experiments. These flasks typically range from 100 ml to 2000 ml, allowing you to select based on your needs. If you’re working with minimal sample sizes, a 100 ml flask is perfect for precise measurements. For versatility, take into account medium-sized flasks between 250 ml and 500 ml, ideal for various chemical reactions and distillations. When dealing with larger volumes, opt for 1000 ml or 2000 ml flasks that accommodate bulk reactions. Remember to take into account the scale of your experiment and the specific requirements of the chemical reactions to guarantee you choose the most suitable capacity for your tasks.

Joint Type Compatibility

Selecting the right joint type is just as important as choosing the appropriate flask capacity for your experiments. Joint type compatibility guarantees secure connections between your glassware components, helping you avoid leaks or breakage. Common joint types include 24/40 and 35/20 standard joints, with the numeric designation indicating the outer diameter in millimeters. This specification affects how well different pieces of glassware fit together. Using mismatched joints can compromise your work, so always verify compatibility before starting. Standard taper joints allow for easy assembly and disassembly, enhancing your workflow. Confirming your round bottom flask matches the necessary joint type will expand its versatility for applications like distillation and reflux processes, making your lab work more efficient.

Material Quality Assurance

A high-quality borosilicate round bottom flask can greatly impact your laboratory results. When selecting one, consider the thermal resistance; borosilicate glass can handle extreme temperature changes without cracking. Its low coefficient of thermal expansion minimizes breakage risk during heating and cooling. You’ll also want to guarantee the flask has excellent chemical durability, making it resistant to common acids and bases. Transparency is another vital factor, as it allows easy observation of your experiments. Finally, look for heavy wall construction, which enhances pressure resistance and contributes to the flask’s longevity. By focusing on these material quality aspects, you can guarantee your flask meets the demands of your laboratory applications effectively.

Temperature Resistance Levels

When it comes to borosilicate round bottom flasks, understanding temperature resistance levels is important for ensuring they meet your laboratory needs. These flasks can typically withstand temperatures up to 450°C, making them ideal for various heating processes. The strain point is around 515°C, allowing them to endure thermal stress without breaking. However, keep in mind that sudden temperature changes exceeding 200°C can cause breakage, so it’s best to heat and cool them gradually. Many flasks have a softening point of about 820°C, which indicates when they start losing structural integrity. When selecting a flask, consider the maximum withstand temperature, usually between 250°C and 450°C, depending on its design and intended use.

Design Features Importance

Choosing the right borosilicate round bottom flask hinges on several critical design features. The round bottom design promotes uniform heating, which is crucial for chemical reactions and distillation. Look for a flask with a single neck and a standard taper joint; this guarantees compatibility with various apparatus and simplifies your experimental setup. Heavy wall construction is another important factor, as it enhances durability and allows the flask to withstand high temperatures and thermal shocks without breaking. Additionally, the smooth surface and high transparency of borosilicate glass improve visibility during reactions and minimize contamination risks. Finally, these flasks can endure temperatures up to around 250°C, making them suitable for a variety of laboratory applications, including reflux and digestion.

Usability in Applications

Understanding the usability of borosilicate round bottom flasks is essential for optimizing your laboratory work. These flasks can withstand high temperatures and thermal shocks, making them perfect for boiling and reflux reactions. Their round bottom design guarantees uniform heating and efficient mixing, enhancing your reaction rates and overall experimental outcomes. When selecting a flask, consider those with standard taper joints like 24/40 or 35/20, as they provide secure connections with other glassware and minimize the risk of leaks. The chemical resistance of borosilicate glass allows you to work with various substances, including acids and alkalis. Plus, the heavy wall construction guarantees durability and reusability, making these flasks reliable tools for rigorous lab environments.

Warranty and Support Options

A solid warranty and reliable support options can make all the difference when you’re selecting a borosilicate round bottom flask. Many flasks come with a 1-year limited warranty, protecting you against defects or damages right from the start. Before you make a purchase, be sure to check the warranty details; some manufacturers offer extended warranties for extra peace of mind. Customer support is essential, too—look for brands that respond within 24 hours to address issues with damaged products. Additionally, check if the product includes specific instructions for contacting customer service. Evaluating these warranty and support options assures you of the flask’s quality and long-term usability in your laboratory settings.