Kjeldahl Flask
Product Code : LSK-LF-10426
Kjeldahl Flask (SKU LSK-LF-10426) is a borosilicate glass digestion flask with a ground-joint socket, used for the determination of nitrogen. The socket lets it connect directly to jointed fume-extraction or distillation glassware. Six versions run from 50 mL to 800 mL with 19/26 or 24/29 sockets. Analytical, agricultural, food and pharmacy labs use it routinely. Science Lab Supplies supplies it out of Ambala, India to colleges, testing laboratories, research institutes, tender contractors and distributors.
Specifications
The smaller flasks (50 mL and one 100 mL version) carry a 19/26 socket and suit micro-scale digestions, while a second 100 mL version and the 300, 500 and 800 mL flasks use a 24/29 socket. Heights range from 200 mm to 340 mm.
| Parameter | Value |
|---|---|
| SKU | LSK-LF-10426 |
| Glass | Borosilicate |
| 50 mL | Socket 19/26; height 200 mm |
| 100 mL | Socket 19/26 or 24/29; height 200 mm |
| 300 mL | Socket 24/29; height 295 mm |
| 500 mL | Socket 24/29; height 300 mm |
| 800 mL | Socket 24/29; height 340 mm |
| Purpose | Determination of nitrogen |
| Supplied by | Science Lab Supplies, Ambala, India |
Applications and Experiments for the Kjeldahl Flask
The flask holds the sample during acid digestion, the first stage of Kjeldahl nitrogen analysis; the ground socket then lets it join jointed fittings without rubber bungs. Food, feed, soil and pharmaceutical labs rely on this chemistry lab equipment in India for nitrogen and protein testing.
- Food science and dairy technology: crude protein estimation from nitrogen content.
- B.Sc. and M.Sc. agriculture: total nitrogen in soil, fertiliser and plant tissue.
- B.Pharm. analytical practicals: nitrogen determination in drug substances.
- Semi-micro Kjeldahl work using the 50 and 100 mL flasks with a 19/26 socket.
Digestion involves boiling concentrated sulphuric acid, so use a fume hood, protective equipment and trained supervision.
Standard Scope of Supply
Each Kjeldahl Flask is supplied singly in the capacity and socket size you specify. Heating blocks, distillation units, fume manifolds and reagents are not included; related glassware can be listed on the same quotation if you need it.
Packing, MOQ and Lead Time
Whether you are replacing a few broken flasks or equipping a new digestion rack, request a quotation for the exact sizes and numbers; it will show packing, delivery time and price. Science Lab Supplies, as a laboratory glassware supplier in India, can include receiving flasks too.
Being a registered exporter with an Importer-Exporter Code, Science Lab Supplies can ship to buyers in Egypt, Iraq, Nigeria, Kenya, Ghana and Ethiopia. Place a list in the enquiry cart, raise a question on the contact page, or go to the lab tender page for tender procurement.
Frequently Asked Questions
How is this flask different from the Kjeldahl Flask without Joint?
This model has a ground-joint socket (19/26 or 24/29) and includes a 50 mL size; the version without joint has a plain neck and is listed from 100 mL to 800 mL.
Which socket size should I choose?
Pick the socket that matches your fume head or distillation fittings: 19/26 on the 50 and 100 mL flasks, or 24/29 on the 100 to 800 mL flasks.
Is the flask made of borosilicate glass?
Yes. It is made of borosilicate glass, which is the usual choice for the heat of acid digestion.
Who supplies the Kjeldahl Flask?
Science Lab Supplies supplies it from Ambala, India, for testing labs, colleges and tender buyers.
Related Laboratory Flasks
These flasks from the same range complete a nitrogen-analysis bench, from the plain-neck digestion flask to the flasks used for distillation and titration, so one quotation can cover the whole Kjeldahl workflow.
- Kjeldahl Flask without Joint — plain-neck version, 100 to 800 mL.
- Distillation Flask — side-arm flask for simple distillation.
- Conical Flask — receiver for the distillate and titration.
- Round Bottom Flask, Narrow Neck — rimmed-neck borosilicate flask for heating.
Browse the full laboratory flasks range or all school lab equipment.
Last updated: 25 September 2026
