Burettes with PTFE Needle Valve Stopcock
Product Code : EL-GB-10172
Quick answer: This is a borosilicate glass burette with blue-print graduation and a PTFE needle-valve stopcock, which gives finer control over flow rate than a standard key stopcock, useful for titrations needing very slow, controlled addition near the endpoint.
Burettes with PTFE Needle Valve Stopcock — Specification
| Feature | Detail |
|---|---|
| Material | Borosilicate glass |
| Stopcock | PTFE needle-valve stopcock |
| Print colour | Blue enamel graduation |
Why a Needle-Valve Stopcock
A needle-valve design lets the operator fine-tune flow rate more precisely than a standard quarter-turn key stopcock, which is useful for titrations that need very slow, controlled addition as the endpoint approaches. Like other PTFE stopcocks on this site, it does not need grease and resists attack from most laboratory reagents. For a standard key-stopcock version, see Burettes with PTFE Key Stopcock.
Frequently Asked Questions
What is a needle-valve stopcock for?
It allows finer control over the flow rate than a standard key stopcock, useful for slow, controlled addition near a titration endpoint.
Is a standard key-stopcock version available?
Yes, see Burettes with PTFE Key Stopcock.
Does the stopcock need grease?
No, PTFE stopcocks do not need grease and resist attack from most laboratory reagents.
Is this suited to student laboratories?
It can be, though its main benefit — finer flow-rate control — is most useful for titrations requiring precise, slow addition near the endpoint.
Related Products
Other burettes and burette accessories from Lab Glassware Manufacturer: Burettes with PTFE Key Stopcock, Burettes with PTFE Key Stopcock Schellbach Stripe, Burette Brush, Burette Clamp Aluminium.
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Last updated: September 2026.