Best Lab Kjeldahl Flasks in 2026
Daisy
Last Updated: Feb 10, 2026
Daisy
Last Updated: Feb 10, 2026
* PickSmartly editors independently research, review, and endorse the top products through comprehensive data analysis. We may earn a commission for qualifying purchases made through our product links.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Ulab Scientific | 7.46 | ✅ | ✅ | ✅ |
5 Sizes 50ml 150ml 250ml 500ml 1000ml
High quality 3.3 Borosilicate glass, Uniform wall thickness
Extra large marking spot
Tolerance is approximately +/- 5%
ASTM Specification E960, Type I requirements
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| QWORK | 9.91 | ✅ | ✅ | ✅ |
Package contains: 1 Pack 500ml Single Neck Flat bottomed flask.
Standard size: With 24/40 Standard Taper Outer Joint, capacity is 500ml.
Widely used: Can be connected to a distillation adapter for collecting and measuring liquids.
Durable: Made of high-quality borosilicate glass, it can be directly heated in an open flame, high temperature and low temperature resistance, and can be reused.
Flat-bottomed flask: The flask can stand upright on a flat surface by itself, rather than on a flask holder or cork holder. Can be connected to laboratory glassware, with standard tape joints.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Laboyglass | 5.29 | ✅ | ✅ | ✅ |
DESIGN----Round bottom design having spherical bottoms are more resistant to fracturing under vacuum, as a sphere more evenly distributes stress across its surface. A cork stand is needed to keep the round bottom flask upright,or heated by the water bath ,oil bath or sand bath.Comparing to the single neck round bottom flask,this 2 neck flask featured an angled neck with standard taper joint as an extra opening.
WIDELY USED---The 2 neck round bottom flask is widely used in the organic chemistry process like distillation, reflux ,extraction,reaction etc.In a distillation apparatus,the 2 neck round bottom flask used as the distillation flask,the straight neck attaches a 3 way distillation adapter or a distillation column(in fractional distillation),the other neck can be used to connect a thermometer adapter ,bleeding tube, or additional funnel.
DIMENSIONS-----This 2 neck round bottom flask has capacity of 2000mL, with 24/40 center joint & 24/40 side joint,attaching any lab glassware apparatus with standard taper joint.
HEAVY WALL ---The 2 neck flask is heavy-wall designed , made by hand-blowing according to ASTM E438 ,made of high-quality borosilicate glass and annealed at 800 degree Celsius ,can be heated directly in an open flame and can withstand typical laboratory thermal variations in Chemistry processes like heating and cooling,durable and reusable.
100% 90 DAY MONEY BACK GUARANTEE If you are not satisfied for any reason, simply return for a full refund, no questions asked. You have nothing to lose.Please also kindly undertand glassware is fragile, even if we pack them carefully,it may be broken during the shipment ,if you receive the items in broken status,don't hesitate to contact us ,we will arrange free replacement or full refund.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| QWORK | 9.91 | ✅ | ✅ | ✅ |
Premium Quality: Made of high-quality borosilicate glass, heavy glass wall, durable and reusable.
Standard Size: The round-bottom flask features the 24/40 standard taper outer joint, interchangeable and leak-free. The capacity of 1000ml.
Heat-Resistant: With the round bottom, the boiling flask is more resistant to breaking under vacuum, as a sphere can evenly distribute stress across its surface. Heavy glass wall, made by hand-blowing to ensure even wall thickness, made of high-quality borosilicate glass and annealed at 800 degrees Celsius, can be heated directly in an open flame and can withstand typical laboratory thermal variations in chemistry processes like heating and cooling.
Wide Application: The round bottom flask is widely used in organic chemistry, in distillation, or vacuum distillation apparatus.
Satisfaction Guaranteed: If you're not completely satisfied with our product, you will get 100% complete refund in one month.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| PYREX Glass - Labware | 6.22 | ✅ | ✅ | ✅ |
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.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| hBARSCI | 9.90 | ✅ | ✅ | ✅ |
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
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| hBARSCI | 9.90 | ✅ | ✅ | ✅ |
Designed for nitrogen determination as per Kjeldahl method
Made of high quality Borosilicate glass
800mL capacity
Rounded Base
Conforms to DIN ISO 12360 standard
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Workshop Store | 5.36 | ❌ | ❌ | ❌ |
Capacity: 500ml
Long neck round bottom Kjeldahl flask
O.D.of bulb: 100mm; O.D.of neck: 30/35mm; Height: 300mm
Product for nitrogen determination as per Kjedahl method
Made of Borosilicate 3.3 glass
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Workshop Store | 5.36 | ❌ | ❌ | ❌ |
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
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Amazon.com | 9.68 | ✅ | ✅ | ✅ |
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Chad Bi | 5.56 | ❌ | ❌ | ❌ |
LABORATORY GLASSWARE-- Light in weight, easy for you to store and carry, will not take much space of laboratory.
LONG-NECK GLASS FLASK-- Usage: Suitable for labs, chemistry rooms, education, , classrooms, agriculture and other fields where research and experiments need to be conducted.
ROUND FLASK-- simple distillation, steam distillation, fractional distillation, boiling,
SCIENCE BEAKERS-- Material: Made of borosilicate glass, the walls of the flask are very hard and very to high temperature, acid and alkali.
NARROW MOUTH ERLENMEYER-- Adopted high grade glass material, sturdy and for long- lasting use.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Deschem Science Supply | 6.25 | ❌ | ❌ | ❌ |
Be Made From G3.3 Borosilicate Glass
Annealing Point ------560℃
Linear Coefficient of Expansion------ 32×10-7/℃
Softening Point------820℃
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Deschem Science Supply | 6.25 | ❌ | ❌ | ❌ |
Be Made From G3.3 Borosilicate Glass
Annealing Point ------560℃
Linear Coefficient of Expansion------ 32×10-7/℃
Softening Point------820℃
Here is the list of top-rated brands that were evaluated by PM.
| Brand | Count |
|---|---|
| Deschem | 2 |
| Donlab | 2 |
| Eisco | 2 |
| Qwork | 2 |
| Kimax | 1 |
| Laboy | 1 |
| Pyrex | 1 |
| Ulab | 1 |
| Ultechnovo | 1 |
We've carried out a comprehensive analysis of 432 reviews on lab kjeldahl flasks, using our selection criteria to identify the best options in the categories. Our findings reveal that most customers typically select lab kjeldahl flasks priced around $80.62, with top brands including and labvida and karter scientific
Our team of expert editors reviewed these high-quality items and handpicked the top 13 lab kjeldahl flasks for your consideration. We've also done extensive research on numerous sellers, identifying the best ones in the categories category. These include and invotest and lake charles manufacturing .
We are dedicated to assisting our users in finding the right flasks Products based on their needs, saving them considerable time when choosing which lab kjeldahl flasks to buy. We take pride in the number of satisfied users we've helped through our thorough and insightful reviews.
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