Quick Answer:The Burettes with PTFE Needle Valve Stopcock have a borosilicate glass body and a PTFE needle valve stopcock that gives a leakproof seal and finer flow control without lubrication, in five sizes from 5 ml to 100 ml.
Last updated: 18 October 2026
Key Features
PTFE needle valve stopcock with a leakproof seal.
Finer flow control.
No lubrication needed and no plug seizure.
Borosilicate glass body, heat and chemical resistant.
Graduated; 5, 10, 25, 50 and 100 ml capacities.
Technical Specifications
Specification
Value
Material
Borosilicate glass
Stopcock
PTFE needle valve
Capacities
5 ml, 10 ml, 25 ml, 50 ml, 100 ml
Graduation
Graduated
Lubrication
Not required
How It Is Used
Turning the needle valve opens the outlet gradually, so titrant can be run in quickly and then cut back to single drops near the end point. With no grease to apply, the plug does not seize and the seal stays leakproof.
Frequently Asked Questions
Does the stopcock on the Burettes with PTFE Needle Valve Stopcock need greasing?
No. The PTFE needle valve stopcock needs no lubrication, seals without leaks and does not suffer from plug seizure.
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