Class A Burette with PTFE Stopcock

A burette is the standard instrument for dispensing variable, measured volumes of liquid in titration. The Class A Burette with PTFE Stopcock is made of borosilicate glass 3.3, a glass type used in laboratoryware for its resistance to thermal shock and to many common laboratory reagents. Confirm chemical compatibility for your specific reagents.

The Class A designation means the burette is made to the higher accuracy grade used for analytical work. Each burette is supplied with an individual calibration certificate. This gives laboratories documentation for that specific unit, which helps where audits, quality systems, or method records call for calibrated volumetric glassware. Refer to the certificate for the calibration details of the burette you receive.

The stopcock is fitted with a PTFE key. It requires no lubrication, so the operator does not need to apply grease before use. The user turns the stopcock to control flow, from a steady stream to single drops near the endpoint. This matters in titration, where the drop volume near the endpoint decides how precisely the result can be read.

The burette is used clamped upright on a burette stand and filled with the titrant. Before use, rinse it with a small amount of the solution to be dispensed. Clean it after use with laboratory detergent and rinse it thoroughly with deionized water. Avoid abrasive tools on the graduated bore.

Osmosis Scientific supplies the Class A Burette with PTFE Stopcock for laboratories running titration and volumetric analysis, including quality control, academic, and research settings.

Common Uses and Applications

• Acid-Base Titration: Delivers titrant in controlled volumes to determine the concentration of acids or bases in a sample.
• Redox Titration: Dispenses oxidizing or reducing titrants for volumetric determinations, where compatibility with the reagent should be checked.
• Complexometric Titration: Used to add titrant gradually when analyzing metal ion content with suitable indicators.
• Standardization of Solutions: Supports the preparation and standardization of titrant solutions in analytical workflows.
• Quality Control Testing: Used in industrial, food, and pharmaceutical laboratories for routine volumetric analysis.
• Teaching and Training: A Class A burette with PTFE stopcock lets students practice titration technique without lubricating the stopcock.