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Burettes with PTFE Needle Valve Stopcock
Burettes with PTFE Needle Valve Stopcock (Product Code: SLE/GBu/06) combine a graduated borosilicate glass body with a Rotaflow-type PTFE needle valve in place of a conventional key. The valve gives a leakproof seal and finer control of flow, needs no lubrication and avoids the plug seizure that can affect ground stopcocks. They are chosen by college, university and analytical laboratories that want precise, drop-by-drop delivery near the end point, and are made by Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, for chemistry lab glassware buyers in India and overseas.
Specifications
| Parameter | Detail |
|---|---|
| Body | Borosilicate glass |
| Stopcock | Rotaflow-type PTFE needle valve |
| Valve benefits | Leakproof seal, finer flow control, no lubrication needed, no plug seizure |
| Capacities | 5 ml, 10 ml, 25 ml, 50 ml, 100 ml |
| Scale | Graduated |
| Properties | Heat resistant, chemical resistant |
| Application | Chemical laboratory titrations |
Typical Use
A needle valve opens progressively as it is turned, rather than in a single quarter-turn, so the operator can run titrant quickly at first and then slow it to single drops or even part-drops as the colour change approaches. That makes this burette well suited to titrations with gradual or subtle end points, to repeat determinations where readings must agree closely, and to teaching students careful end-point technique.
Open and close the valve with light finger pressure only; the seal comes from the PTFE needle seating in the glass, and forcing it closed does not improve the seal. Because no grease is used, the burette is simple to rinse and there is no lubricant to contaminate sensitive solutions. For stable readings, clamp it on a burette stand — a standard piece of chemistry lab equipment in India — with the jet just inside the neck of the receiving flask.
Manufacturer
These needle valve burettes come from Jain Scientific Equipments Private Limited, which markets its laboratory products under the ScienceLab name. The company works from Ambala in Haryana, India, and serves teaching and analytical laboratories at home and abroad. Visit the company profile for an overview of the organisation.
Related Laboratory Equipment
Pair this burette with the following for a complete titration set-up:
- Burette Stand with Clamp & Bosshead — stand, clamp and boss head for mounting the burette
- Flask, Conical, Wide Neck — a receiving flask with room for the jet and a wash-down
- Wash Bottle LDPE with Narrow Mouth — for rinsing a hanging part-drop into the flask
- Burette, Class-B, with PTFE Key Stopcock — a quarter-turn key alternative for routine class work
Other burette designs are listed under Glassware Burettes.
Frequently Asked Questions
How does a needle valve differ from a key stopcock?
A key opens with a quarter-turn, while a needle valve opens gradually as it is rotated, giving much finer control of flow near the end point.
Does the valve need stopcock grease?
No. The PTFE needle valve eliminates the need for lubrication, so there is no grease to wipe away or contaminate the titrant.
Will the valve stick if the burette is stored for a while?
The PTFE needle design is intended to avoid plug seizure. Rinse and drain the burette before storage and leave the valve lightly closed.
What accuracy class is this burette?
An accuracy class is not stated in our listing for this model. Please contact us if your method specifies one.
Which capacities can be supplied?
5 ml, 10 ml, 25 ml, 50 ml and 100 ml.
Is a calibration certificate provided?
Discuss calibration paperwork with us before you order, through the contact page.
Can laboratories order these in quantity?
Yes, we supply institutions and distributors in India and international markets; include sizes and quantities in your enquiry.
Request a Quote
Send the sizes and quantities you need via our contact page, or add this item to the enquiry cart to request a quotation with other glassware.
Last updated: 24 September 2026
