Burette Glass, PTFE Rotaflow Needle Valve - Class A

Class A glass burettes with PTFE Rotaflow needle valves are precision volumetric instruments designed for accurate titration. The Rotaflow valve provides smooth, leak-proof control without the need for lubrication, as the PTFE needle is highly resistant to chemical attack. 

• Accuracy: Conforms to ISO 385 Class A standards, offering high precision for professional laboratory work.
• Material: Manufactured from heavy-duty Borosilicate 3.3 glass, ensuring excellent thermal and chemical durability.
• Rotaflow Valve: Features a screw-thread stopcock with a PTFE needle for fine flow control. Unlike glass stopcocks, these do not "freeze" and require no grease.
• Certifications: Often supplied with a batch certificate or individual certificate to confirm accuracy and traceability. 

Capacity (mL)	Graduation (mL)	Tolerance ( mL)	Typical Use
10 mL	0.05	0.03	Micro-titrations
25 mL	0.10	0.05	Standard lab analysis
50 mL	0.10	0.05	Most common titration size
100 mL	0.20	0.10	Large volume titrations