Accurate nitrogen determination is crucial in many scientific and industrial applications, from food analysis to environmental testing. The Kjeldahl flask is a fundamental piece of equipment in this process. Selecting the right flask ensures reliable results, consistent performance, and safe laboratory operation.
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- Designed for nitrogen determination as per Kjeldahl method
- Made of high quality Borosilicate glass
- 100mL capacity
- Long neck, round bottom
- Conforms to DIN ISO 12360 standard
- StonyLab Kjeldahl Flask is commonly used as an air condenser during digestion stage and reduces entrainment during the distillation stage of the Kjeldahl process; ideal for determination of nitrogen, etc
- Capacity: 100 ml
- With 24/40 standard taper outer Joints
- Made of borosilicate glass; heavy duty, heavy all and durable; maximum withstand temperature 200°C
- Warranty: StonyLab 1-Year Limited Warranty; if received damaged, please contact us immediately; we will solve it until satisfied
- Designed for nitrogen determination as per Kjeldahl method
- Made of high quality Borosilicate glass
- 50mL capacity
- Socket size: 19/26
- Conforms to DIN ISO 12360 standard
- StonyLab Kjeldahl Flask is commonly used as an air condenser during digestion stage and reduces entrainment during the distillation stage of the Kjeldahl process; ideal for determination of nitrogen, etc
- Capacity: 500 ml
- With 24/40 standard taper outer Joints
- Made of borosilicate glass; heavy duty, heavy all and durable; maximum withstand temperature 200°C
- Warranty: StonyLab 1-Year Limited Warranty; if received damaged, please contact us immediately; we will solve it until satisfied
- Design:Kjeldahl shape design,with an outer joint at opening and a high vacuum valve at sidearm.
- Size:Capacity of 25mL;With 0-4mm high vacuum valve.
- Usage:Used for reaction or storage.
- Material: Using the heavy-quality glass tubing made of borosilicate glass 3.3.
- Craftsmanship:Hand-blown according to ASTM E438 standards.
- Capacity: 50ml
- Long neck round bottom Kjeldahl flask
- Standard 24/40 ground glass joint
- Product for nitrogen determination as per Kjedahl method
- Made of Borosilicate 3.3 glass
- LABORATORY FLASK: Corning provides a number of PYREX brand flasks for special purpose applications
- SAFE & DURABLE: Offering superior heat, chemical and thermal shock resistance
- PERMANENT MARKINGS: Permanent white enamel to resist chemical attack during lab usage
- EASY TO CLEAN: The reusable glass scientific flasks are easy to clean and can be sterilized safely in autoclaves at 121°C, making them ideal for repeated use in busy lab environments.
- PYREX GLASSWARE: PYREX scientific glassware has been a trusted partner for chemists and research scientists in the toughest laboratory environments for more than 100 years.
- Ideal for vacuum distillation: designed for laboratory experiments involving vacuum distillation, this apparatus facilitates thermometer and capillary installation through integrated interfaces
- Versatile port configuration: featuring 4 Standard 24/40 Joints, it seamlessly connects with distillation units for effective operation
- Enhanced safety: this apparatus prevents the aggressive boiling of liquids into the condenser tube, ensuring a controlled distillation process
- Made of borosilicate glass, it offers excellent corrosion resistance and a low thermal expansion coefficient; instantaneous temperature difference must not exceed 140°C; stable working temperature: 450°C; ensure tight connections during operation and...
- 1-year limited manufacturer warranty
- Be Made From G3.3 Borosilicate Glass
- Annealing Point ------560℃
- Linear Coefficient of Expansion------ 32×10-7/℃
- Softening Point------820℃
- Our Kjeldahl shape schlenk flask features a standard joint for easy integration with other glassware.
- Reaction flask has a sidearm fitted with a glass stopcock connecting to a vacuum or inert gases source.
- Designed with a pear-shaped design, this glass stopcock offers ample storage space, making it suitable for kjeldahl-style storage tubes. It's versatile and durable.
- The standard joint on this glass stopcock allows for seamless connection with schlenk reaction flasks and other lab glassware. It enhances your lab setup's functionality.
- Crafted from high-quality glass, this pear-shaped stopcock is resistant to thermal shock and chemical reactions.
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Last update on 2026-04-21 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best Lab Kjeldahl Flasks
Capacity
Kjeldahl flasks come in various sizes, typically ranging from 100 mL to 2000 mL. The appropriate capacity depends on the sample size and the volume of reagents required for your specific analysis. For routine analyses with smaller samples, a 300 mL or 500 mL flask is often sufficient. Larger volumes may necessitate a 1000 mL or 2000 mL flask.
Material and Construction
Most Kjeldahl flasks are made from borosilicate glass, known for its resistance to thermal shock and chemical corrosion. This durability is essential for withstanding the high temperatures and acidic conditions common in the Kjeldahl digestion process. Look for flasks with a sturdy construction, clear graduations for accurate volume measurement, and a long neck to minimize sample loss during boiling.
Joint Size and Compatibility
If your setup involves connecting the flask to other apparatus, such as a distillation unit or a condenser, ensure the flask has the correct joint size. Standard ground glass joints (e.g., 24/40) are common. Verify that the joint size matches your existing equipment to ensure a secure and leak-free connection.
