PTFE Key Stopcock Burette
Product Code : EL-GS-10265
Quick answer: A PTFE key stopcock replaces the ground-glass key of a conventional glass stopcock with a solid PTFE (polytetrafluoroethylene) plug, so the burette can be operated dry, without lubricating grease, while resisting attack from acids, alkalis, and most laboratory solvents.
| Size (mm) | Bore Size (mm) | Key Material |
|---|---|---|
| 12.5 | 2.5 | PTFE |
Dimensions follow standard specifications.
PTFE Key vs. Glass Key: Choosing the Right Stopcock
Laboratories that titrate aggressive reagents such as strong acids, alkalis, or oxidizing solutions often prefer a PTFE key stopcock over a conventional glass straight stopcock, since the PTFE key does not require lubricating grease and will not seize or bind after repeated exposure to corrosive chemicals. A ground-glass key stopcock remains a cost-effective choice for routine aqueous titrations, while the PTFE version is generally specified where chemical resistance and grease-free operation are priorities. Bore size should be selected to match flow-rate requirements for the specific titration or dispensing procedure.
Frequently Asked Questions
Is a PTFE key stopcock suitable for organic solvents?
PTFE resists most common laboratory organic solvents; buyers with an unusual reagent list should confirm chemical compatibility with our team before ordering.
Does the PTFE key need lubrication?
No. Unlike a ground-glass key, a PTFE key stopcock is designed to operate dry, without silicone or hydrocarbon grease.
What bore size should I choose?
The listed 2.5mm bore suits standard titration flow rates; contact us if your application needs a faster or slower controlled flow.
Related Products
- Glass Key Stopcock For Burette
- Glass Straight Stopcock
- Straight PTFE Key Stopcock
- Glass Stopcocks
- Laboratory Glass Stopcocks
Request a Quote
For indicative FOB/CIF export pricing on the PTFE Key Stopcock Burette, or to request a formal quotation, please contact us or view current tenders.
Last updated: September 2026