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This 50mL polypropylene volumentric flask offers the accuracy of standard glass flasks combined with the break resistance of plastic. Individually calibrated gravimetrically 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. Has an oval marking spot. Can be autoclaved but accuracy will be affected. Translucent. Autoclavable. Leakproof. Material: polypropylene flask and screw closure. Capacity: 50mL. Closure size: 13mm. Limit of error: ±0.10mL. Height with closure: 146mm. Nalgene #: 4000-0050.