Class A Graduated Burettes (TD, Ex), PTFE Screw Thread Stopcock, Batch Certified

Each burette is individually calibrated on advanced computer-controlled machinery To Deliver (TD, Ex) its stated volume at a standard 20°C baseline. Designed with a mandatory 30-second liquid-delivery waiting time, these tubes allow the fluid film along the inner glass walls to settle completely before taking a final meniscus reading. The assembly comes outfitted with a specialized polytetrafluoroethylene (PTFE) screw thread stopcock that provides smooth, micro-drop control without requiring stopcock grease, ensuring your reagents remain free from hydrocarbon contamination.

Key Functional Benefits:

• Class A Volumetric Fidelity: Meets the strict error tolerances mandated by ASTM E287 and USP guidelines, making these burettes ideal for regulated pharmaceutical and analytical testing
• Grease-Free PTFE Stopcock: Features a durable PTFE screw thread valve that resists chemical attack from aggressive acids and bases while preventing joint freezing or fluid leakage
• Computer-Controlled Calibration: Every unit is precision-etched with high-contrast, durable graduation lines using automated systems to eliminate human manufacturing variances
• Official Batch Certification: Each shipment includes an official batch certificate documenting compliance, lot trace tracking, and volumetric testing data for facility quality control audits