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 to jointed glassware without rubber bungs. Six versions run from 50 mL to 800 mL with 19/26 or 24/29 sockets, suiting analytical, agricultural, food and pharmacy practicals. Colleges, testing laboratories, research institutes, tender contractors and distributors receive quotations for it from Science Lab Supplies, which dispatches from Ambala, India.
Specifications
Socket and height details for all six versions of the jointed Kjeldahl flask are tabulated below. In short, the 50 mL flask and one 100 mL version carry a 19/26 socket for semi-micro digestions, while a second 100 mL version and the 300, 500 and 800 mL flasks use 24/29; heights run from 200 mm to 340 mm.
| Specification | Value |
|---|---|
| SKU | LSK-LF-10426 |
| Glass | Borosilicate |
| Neck | Ground-joint socket |
| Socket 19/26 | 50 mL and 100 mL |
| Socket 24/29 | 100, 300, 500 and 800 mL |
| Height, 50 mL | 200 mm |
| Height, 100 mL | 200 mm |
| Height, 300 mL | 295 mm |
| Height, 500 mL | 300 mm |
| Height, 800 mL | 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. It suits food, feed, soil and pharmaceutical nitrogen and protein testing as chemistry lab equipment in India.
- 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, with standard acid for the titration kept in a Glass Reagent Bottle With Screw Cap.
- 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 work in a fume hood, secure the flask with a Four Prong Laboratory Clamp on a Retort Stand with Boss Head and Clamp, and use protective equipment under 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 can be listed on the same quotation, together with any related glassware, if you are setting up a full digestion line.
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. Quote the socket size next to each capacity when you use the contact page, or tick off flasks in the enquiry cart; procurement through tenders is described on the lab tender page.
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 comes in 100, 300, 500 and 800 mL.
Which socket size should I choose?
Pick the socket that matches your fume head or distillation fittings: 19/26 on the 50 mL and one 100 mL flask, or 24/29 on the other 100 mL flask and the 300 to 800 mL flasks.
Is the flask made of borosilicate glass?
Yes. It is made of borosilicate glass, a heat-resistant laboratory glass suited to the hot acid of Kjeldahl digestion when the flask is heated gradually and handled with care.
Who supplies the Kjeldahl Flask?
Testing labs, colleges and tender buyers assembling Kjeldahl apparatus in India can source it through Science Lab Supplies, whose Ambala team quotes any mix of the six capacity and socket versions.
Related Kjeldahl and Titration Glassware
These flasks, condensers and burettes from the Laboratory Flasks, Lab Glassware, Chemistry Lab and Glassware Burette ranges complete a nitrogen-analysis bench, from the plain-neck digestion flask to distillation and titration, so one quotation can cover the whole Kjeldahl workflow.
- Kjeldahl Flask without Joint — plain neck, 100 to 800 mL, 60 to 117 mm in diameter.
- Distillation Apparatus — borosilicate set with 19/26 joints, still head, separating funnel and 500 ml boiling flask.
- Liebig Condenser — straight water-cooled borosilicate condenser with a 200 mm jacket.
- Distillation Flask — 7 mm or 9 mm side arm, 100 to 500 mL.
- Conical Flask — hollow glass stopper, sizes from 100 mL to 2000 mL.
- Borosilicate Burette with Rota Stopcock — 50 mL borosilicate 3.3 burette with a PTFE screw-turn stopcock.
- Burettes with Schellbach stripe — blue-printed borosilicate burette with a stripe for meniscus reading.
Browse the full Laboratory Flasks range, the Lab Glassware range for condensers and bottles, or all school lab equipment.
Last updated: 22 October 2026
