Burette Class B With Glass Stopcock
Product Code : EL-GB-10145
Quick answer: This is a straight, Class B tolerance glass burette fitted with a glass key stopcock and amber enamel graduation, a traditional and economical choice for routine teaching and laboratory titration work.
Burette Class B With Glass Stopcock — Specification
| Feature | Detail |
|---|---|
| Material | Borosilicate glass |
| Stopcock | Glass key stopcock |
| Tolerance class | Class B |
| Print colour | Amber enamel graduation |
Glass Stopcock vs PTFE Stopcock
A glass key stopcock is the traditional design for a burette, and needs a thin film of stopcock grease to turn smoothly and seal properly. It is a lower-cost option than a PTFE stopcock, and is a common choice for routine teaching and laboratory titration work where Class A certified accuracy is not required. For a grease-free PTFE alternative, see Burette Class-B with PTFE Key Stopcock.
Frequently Asked Questions
Does a glass stopcock need grease?
Yes, a thin film of stopcock grease is normally applied to a glass key stopcock so it turns smoothly and seals properly.
What does Class B mean?
Class B is a standard volumetric tolerance level suited to routine teaching and laboratory titration, as distinct from the tighter, individually serialized Class A tolerance.
Is a PTFE stopcock version available?
Yes, see Burette Class-B with PTFE Key Stopcock for the grease-free option.
How should the stopcock be maintained?
Re-grease lightly if the stopcock becomes stiff or leaks, and avoid over-tightening the retaining nut, which can crack the barrel.
Related Products
Other burettes and burette accessories from Lab Glassware Manufacturer: Burette Class-B with PTFE Key Stopcock, Burette Serialized with PTFE Key Stopcock, Burette Brush, Burette Clamp Aluminium.
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Last updated: September 2026.