Burette Class-B with PTFE Key Stopcock
Product Code : EL-GB-10104
Quick answer: This is a straight glass burette fitted with a PTFE key stopcock and finished to Class B tolerance, offering a chemically resistant, grease-free stopcock at the standard tolerance level used for routine teaching and laboratory titration work.
Burette Class-B with PTFE Key Stopcock — Specification
| Feature | Detail |
|---|---|
| Material | Borosilicate glass |
| Stopcock | PTFE key stopcock — chemically resistant, does not need grease |
| Tolerance class | Class B |
| Typical use | Routine teaching and laboratory titration work |
Why a PTFE Key Stopcock
A PTFE key stopcock turns smoothly without the grease a glass stopcock typically needs, and resists attack from most laboratory reagents, which helps keep the stopcock bore clean and free-turning over repeated use. Class B tolerance makes this version suited to everyday teaching and routine laboratory titration, where certified Class A accuracy is not required; see Burette Serialized for the Class A option.
Frequently Asked Questions
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 used where certified accuracy is required.
Why choose a PTFE stopcock over glass?
A PTFE key stopcock does not need grease, turns smoothly, and resists attack from most laboratory reagents, which helps keep it clean and free-turning over repeated use.
Does the stopcock need maintenance?
PTFE stopcocks generally need less maintenance than glass stopcocks since they do not require greasing; occasional cleaning and rinsing is recommended.
Is a Class A version available?
Yes, see Burette Serialized for the individually numbered Class A option.
Related Products
Other burettes and burette accessories from Lab Glassware Manufacturer: Burette, Burette Serialized, Burette Brush, Burette Clamp Aluminium.
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Last updated: September 2026.