The DURAN® burettes are made of highly chemically resistant borosilicate glass 3.3. Their precise scaling makes them particularly suitable for titrimetric purposes. The amount of liquid required for titration, but previously unknown, can be read off very accurately after the reaction has been completed.

• Made from borosilicate glass 3.3
• Graduated, main volumes ring marked
• Calibration is based on the poured out volume ('Ex') at a 20 °C reference temperature
• The volume content tolerances conform to accuracy Class AS
• With Schellbach stripe and straight standard ground stopcock
• 30 s waiting time

The tolerances for the volume correspond to the error limits of ISO and DIN. DURAN® burettes are available with glass or PTFE keys. Unlike glass keys, PTFE keys do not have to be greased, which simplifies work in the laboratory. Micro burettes with a batch number and accuracy Class AS are supplied with a batch certificate.