Best Lab Kjeldahl Flasks (Sep. 2026) - Rated by CherryPicks' Experts

At a Glance: Our Top Picks

Top 1

stonylab Kjeldahl Flask, Heavy Wall Long Neck Lab Flask Borosilicate Glass Ro...

9.9
CPR Score
Top 2

EISCO Kjeldahl Flask, 50mL - 19/26 Socket Size - Long Neck, Round Bottom - Bo...

9.7
CPR Score
Top 3

EISCO Kjeldahl Flask, 800mL - Long Neck, Round Bottom - Borosilicate Glass

9.6
CPR Score
Tips


Our team has analyzed 68 products of different Lab & Scientific Products brands, including Pyrex, EISCO, stonylab, Deschem, ACE Glass And Chemglass. The following list of top 30 Lab Kjeldahl Flasks is prepared for the customers by analyzing and comparing different 68 Lab Kjeldahl Flasks reviews.

* CherryPicks.Reviews is reader-supported, Our editor review, and recommend the best products based on extensive data analysis, if you click on the product links, we may earn a commission through qualifying products purchased.

The Best Lab Kjeldahl Flasks Rated by CherryPicks

Market Overview
Lab Kjeldahl Flasks Reviewed
  • Reviews Analyzed: 78 Items
  • CPR Avg. Rating: 8.5 / 10
30 Products Evaluated
  • Highest Price: $446.92
  • Lowest Price: $10.55
  • Avg. Price: $81.49
Price Disclaimer

Top 30 Lab Kjeldahl Flasks on Amazon (Verified You can Buy)

Top 1

stonylab Kjeldahl Flask, Heavy Wall Long Neck Lab Flask Borosilicate Glass Round Bottom Kjeldahl Flask with 24/40 Standard Taper Outer Joint, 100 ml

stonylab
KjeldahlFlask-24/40-100ml
2.7559 x 2.7559 x 9.4488 Inches
0.2866 Pounds

Ratings for stonylab (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
J & D TECH INC 735

Features

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
Show More
Top 2

EISCO Kjeldahl Flask, 50mL - 19/26 Socket Size - Long Neck, Round Bottom - Borosilicate Glass

EISCO
CH0436A
6.8 x 2.0 x 2.0 inches
0.1 Pounds

Ratings for EISCO (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
The Lab Stockroom 3,738

Features

Designed for nitrogen determination as per Kjeldahl method
Made of high quality Borosilicate glass
Show More
Top 3

EISCO Kjeldahl Flask, 800mL - Long Neck, Round Bottom - Borosilicate Glass

EISCO
CH0438D
4.2 x 4.2 x 13.8 inches
1.0 pounds

Ratings for EISCO (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
The Lab Stockroom 3,738

Features

Designed for nitrogen determination as per Kjeldahl method
Made of high quality Borosilicate glass
Show More
Top 4

stonylab Kjeldahl Flask, Heavy Wall Long Neck Lab Flask Borosilicate Glass Round Bottom Kjeldahl Flask with 24/40 Standard Taper Outer Joint, 500 ml

stonylab
KjeldahlFlask-24/40-500ml
3.937 x 3.937 x 11.4173 Inches
0.5886 Pounds

Ratings for stonylab (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
J & D TECH INC 735

Features

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
Show More
Top 5

DONLAB CMA-0050 Borosilicate Glass 50ml Kjeldahl Flask Long Neck Nitrogen Flask Round Bottom with Standard Tapper 24/40 Ground Glass Joint

DONLAB
CMA-0050

Ratings for DONLAB (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
DonLab Store -

Features

Capacity: 50ml
Long neck round bottom Kjeldahl flask
Show More
Top 6

EISCO Kjeldahl Flask, 100mL - Long Neck, Round Bottom - Borosilicate Glass

EISCO
CH0438A
2.5 x 2.5 x 9.5 inches
0.2 pounds

Ratings for EISCO (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
The Lab Stockroom 3,738

Features

Designed for nitrogen determination as per Kjeldahl method
Made of high quality Borosilicate glass
Show More
Top 7

DONLAB CMA-0250 Borosilicate Glass 250ml Kjeldahl Flask Long Neck Nitrogen Flask Round Bottom with Standard Tapper 24/40 Ground Glass Joint

DONLAB
CMA-0050

Ratings for DONLAB (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
DonLab Store -

Features

Capacity: 250ml
Long neck round bottom Kjeldahl flask
Show More
Top 8

DONLAB CMA-1000 Borosilicate Glass 1000ml/1L Kjeldahl Flask Long Neck Nitrogen Flask Round Bottom with Standard Tapper 24/40 Ground Glass Joint

DONLAB
CMA-0050

Ratings for DONLAB (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
DonLab Store -

Features

Capacity: 1000ml/1L
Long neck round bottom Kjeldahl flask
Show More
Top 9

DONLAB CMB-0050 Borosilicate Glass 50ml Kjeldahl Flask Long Neck Nitrogen Flask Round Bottom

DONLAB
CMB0050

Ratings for DONLAB (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
DonLab Store -

Features

Capacity: 50ml
Long neck round bottom Kjeldahl flask
Show More
Top 10

EISCO Kjeldahl Flask, 300mL - Long Neck, Round Bottom - Borosilicate Glass

EISCO
CH0438B
3.0 x 3.0 x 11.8 Inches
0.5 pounds

Ratings for EISCO (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
The Lab Stockroom 3,738

Features

Designed for nitrogen determination as per Kjeldahl method
Made of high quality Borosilicate glass
Show More
Top 11

DONLAB CMB-0100 Borosilicate Glass 100ml Kjeldahl Flask Long Neck Nitrogen Flask Round Bottom

DONLAB
CMB0100

Ratings for DONLAB (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
DonLab Store -

Features

Capacity: 100ml
Long neck round bottom Kjeldahl flask
Show More
Top 12

Corning 5420-800 Long Neck Kjeldahl Flask, Round Bottom, 800mL Capacity, Pack of 6

Corning
89090-476

Ratings for Corning (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
All Star Supplies, Corp. -
Amazon.com -
Thomas Scientific -

Features

Round bottom and long neck
Tooled for uniform rubber stopper fit
Show More
Top 13

DONLAB CMA-0150 Borosilicate Glass 150ml Kjeldahl Flask Long Neck Nitrogen Flask Round Bottom with Standard Tapper 24/40 Ground Glass Joint

DONLAB
CMA-0050

Ratings for DONLAB (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
DonLab Store -

Features

Capacity: 150ml
Long neck round bottom Kjeldahl flask
Show More
Top 14

Laboy Glass 100mL Kjeldahl Schlenk Flask with PTFE Stopcock and 24/40 Glass Outer Joint at Top

LABOY
LBF050108

Ratings for LABOY (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Laboyglass -

Features

Design:Kjeldahl shape design,with an outer joint at opening and a glass stopcock at sidearm.
Size:Capacity of 100mL;With 24/40joint.
Show More
Top 15

DONLAB CMB-0500 Borosilicate Glass 500ml Kjeldahl Flask Long Neck Nitrogen Flask Round Bottom

DONLAB
CMB0500

Ratings for DONLAB (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
DonLab Store -

Features

Capacity: 500ml
Long neck round bottom Kjeldahl flask
Show More
Top 16

Deschem 250ml,24/40,Glass Recovery Flask,Pyriform,Kjeldahl,Rotary Evaporator Bottle

Deschem
0.4409 pounds

Ratings for Deschem (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Deschem Science Supply -

Features

Be Made From G3.3 Borosilicate Glass
Annealing Point ------560℃
Show More
Top 17

DONLAB CMB-0150 Borosilicate Glass 150ml Kjeldahl Flask Long Neck Nitrogen Flask Round Bottom

DONLAB
CMB0150

Ratings for DONLAB (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
DonLab Store -

Features

Capacity: 150ml
Long neck round bottom Kjeldahl flask
Show More
Top 18

Corning Pyrex Borosilicate Glass Round Bottom Micro Kjeldahl Flask with Long Neck, 30ml Capacity (Case of 18)

Pyrex
5440-30

Ratings for Pyrex (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
WorldWide Life Sciences -
Neobits_ -

Features

Product Type :Lab Supply
Package Dimensions :20.701 Cm L X40.513 Cm W X46.99 Cm H
Show More
Top 19

EISCO Kjeldahl Flask, 500mL - 24/29 Socket Size Long Neck, Round Bottom Borosilicate Glass- Eisco Labs

EISCO
13.0 x 4.5 x 4.5 inches
0.5 pounds

Ratings for EISCO (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
The Lab Stockroom 3,738

Features

Designed for nitrogen determination as per Kjeldahl method
Made of high quality Borosilicate glass
Show More
Top 20

Kimble-Chase KIMAX Kjeldahl Flasks, 800 mL - 27400-800 - EACH

Kimble Chase

Ratings for Kimble Chase (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
WorldWide Life Sciences -

Features

Kimble Chase LLC
Top 21

Chemglass CG-1513-03 Series CG-1513 Kjeldahl Flask, Long Neck, 24/40 Outer Joint, 500 mL Capacity

Chemglass
CG-1513-03

Ratings for Chemglass (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Neta Scientific Systems -

Features

Kjeldahl
Long neck
Show More
Top 22

EISCO Kjeldahl Flask, 800mL - 24/29 Socket Size - Long Neck, Round Bottom - Borosilicate Glass

EISCO
CH0436E
13.0 x 5.0 x 5.0 inches
0.9 Pounds

Ratings for EISCO (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
The Lab Stockroom 3,738

Features

Designed for nitrogen determination as per Kjeldahl method
Made of high quality Borosilicate glass
Show More
Top 23

PYREX 500mL Round Bottom Kjeldahl Flask with Long Neck

Corning

Ratings for Corning (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Thomas Scientific -
Top 24

ACE Glass 6967-25 Kjeldahl Flask, 300 mL Capacity, 24/40 Standard Taper Outer Joint

ACE Glass
6967-25
0.0022 Pounds

Ratings for ACE Glass (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Thomas Scientific -

Features

300ml capacity
24/40 standard taper outer joint
Show More
Top 25

ACE Glass 6967-27 Kjeldahl Flask, 800 mL Capacity, 24/40 Standard Taper Outer Joint

ACE Glass
6967-27
0.0022 Pounds

Ratings for ACE Glass (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
All Star Supplies, Corp. -
Thomas Scientific -

Features

800ml capacity
24/40 standard taper outer joint
Show More
Top 26

Flask, Kjeldahl 100 ml

Corning

Ratings for Corning (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Thomas Scientific -
Top 27

Deschem 1000ml,24/40,Glass Recovery Flask 1L Lab Kjelda Bottle Not for Rotary Evaporator Use

Deschem
9.8 x 5.5 x 5.5 inches
0.8378 pounds

Ratings for Deschem (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Deschem Science Supply -

Features

Be Made From G3.3 Borosilicate Glass
Annealing Point ------560℃
Show More
Top 28

Laboy Glass 10mL Kjeldahl Schlenk Flask with PTFE Stopcock and 14/20 Glass Outer Joint at Top

LABOY
LBF050101

Ratings for LABOY (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Laboyglass -

Features

Design:Kjeldahl shape design,with an outer joint at opening and a glass stopcock at sidearm.
Size:Capacity of 10mL;With 14/20 joint.
Show More
Top 29

ACE Glass 6967-26 Kjeldahl Flask, 500 mL Capacity, 24/40 Standard Taper Outer Joint

ACE Glass
6967-26
0.0022 Pounds

Ratings for ACE Glass (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Thomas Scientific -

Features

500ml capacity
24/40 standard taper outer joint
Show More
Top 30

Kjeldahl Flask, 100mL - 19/26 Socket Size - Long Neck, Round Bottom - Borosilicate Glass - Eisco Labs

EISCO
8.5 x 3.0 x 3.0 inches
0.4 Pounds

Ratings for EISCO (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
The Lab Stockroom 3,738

Features

Designed for nitrogen determination as per Kjeldahl method
Made of high quality Borosilicate glass
Show More

Top 10 Lab Kjeldahl Flasks - Verified to Buy (September 2026)

Top 10 Lab Kjeldahl Flasks Brands on Amazon

Here is the list of top-rated brands that were evaluated by CherryPicks.

  • stonylab
  • EISCO
  • DONLAB
  • Corning
  • LABOY
  • Deschem
  • Pyrex
  • Kimble Chase
  • Chemglass
  • ACE Glass

Top 10 Lab Kjeldahl Flasks Sellers: CPR Seller Rank List

CPR sellers rank is based on CherryPicks-AI bestselling ranking system that helps us analyze each seller's sales trends. The List of top seller ranks is our in-house data, essential for our product ranking to help you make the right shopping choice.

Rank Name Yearly Feedbacks Avg. Ratings
🥇 J & D TECH INC 63,881 4.9
🥈 The Lab Stockroom 17,064 4.8
🥉 Thomas Scientific 1,792 4.5
4 All Star Supplies, Corp. 1,249 3.7
5 Neobits_ 847 3.7
6 Neta Scientific Systems 692 4.7
7 Laboyglass 668 4.7
8 Deschem Science Supply 414 4.6
9 Amazon.com 386 4.7
10 DonLab Store 141 4.4
View or download top Lab Kjeldahl Flasks seller & rating report
J & D TECH INC [63881] The Lab Stockroom [17064] Thomas Scientific [1792] All Star Supplies, Corp. [1249] Neobits_ [847] Neta Scientific Systems [692] Laboyglass [668] Deschem Science Supply [414] Amazon.com [386] DonLab Store [141] J & D TECH INC 73% The Lab Stockroom 20% Thomas Scientific 2% All Star Supplies, Corp. 1% Neobits_ 1% Neta Scientific Systems 1% Laboyglass 1% Deschem Science Supply 0% Amazon.com 0% DonLab Store 0%

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Why Should You Trust Us?

Now hundreds and thousands of Lab & Scientific Products supplies are available on Amazon, Picking the right one is not easy, and that may take a lot of your time, Right? and What is the best Lab Kjeldahl Flasks to buy for new September 2026?

CherryPicks’s Methodology for Evaluating Lab Kjeldahl Flasks

We developed the CherryRatings-AI system to identify and score reviews and the CherryPicks-AI ranking system that uses TensorFlow framework to generate the best list, It will help us evaluate Lab & Scientific Products items that sell on Amazon. The score of items is based on over ten parameters such as analyzing customer review content, product reviewing rating statistics, brand reputation evaluation, comparing product price with features, etc, You can visit How We Rank to learn more in detail.

We collected and analyzed 68 of Lab Kjeldahl Flasks reviews based on our selection criteria. It helped us shortlist the top qualified and rated Lab Kjeldahl Flasks for Lab & Scientific Products, We found that most customers choose Lab Kjeldahl Flasks with an average price of $81.49, and the top brands are Pyrex, EISCO, stonylab, Deschem, ACE Glass And Chemglass

Then our expert-level editors reviewed all those quality items and selected the top 30 Lab Kjeldahl Flasks for you, We have researched hundreds of sellers and picked the top sellers for Lab & Scientific Products, including J & D TECH INC, The Lab Stockroom, Thomas Scientific, All Star Supplies, Corp., Neobits_, Neta Scientific Systems, Laboyglass, Deschem Science Supply, Amazon.com, DonLab Store And WorldWide Life Sciences. The stonylab Kjeldahl Flask, Heavy Wall Long Neck L... are available for purchase right now, and The seller of #1 rank product has received honest feedback from 4 consumers with an average rating of 4.6.

We've helped a lot of satisfied users get the right Industrial & Scientific product based on their needs, and save lots of time for them to pick Lab Kjeldahl Flasks to buy.


Written By Thomas Joseph

Thomas Joseph has over 7 years of working experience with a reputation science laboratory. He is a father, a writer, and a pet lover. He would be sharing his expert knowledge on Industrial and scientific equipment to help us make the right purchase.