Flasks, 4000 Volumetric Flask, PPCO; Polypropylene screw closure, NALGENE®

The accuracy of standard glass flasks combined with the break resistance of plastic. Gravimetrically calibrated individually TC/TD at 20°C. Printing is durable; won’t wear off. Guaranteed to meet the Class B accuracy requirements of ASTM E288 and ISO Standard 384. No meniscus to confuse readings. Oval marking spot. 200mL size has additional line at 203mL level for BOD and DO determinations. Before autoclaving, set closure on top of the container without engaging the threads. Autoclavable/Graduated/Leakproof.