DURAN® Volumetric Flask, Class A, amber, white print, with graduation mark and ergonomic polyethylene stopper, with batch certificate and CoC, 5 mL
Volumetric flasks are available in two different accuracy Classes: Class A and Class B. The two Classes differ in the accuracy of measurement with Class A being the highest accuracy, and Class B is approximately half that of Class A. The volumetric flasks with accuracy Class A have a blue print for clear glass products and a white print for amber versions. Volumetric flasks with a batch number and accuracy Class A are supplied with a batch certificate. This certificate documents the mean value obtained from measuring the batch in question, the standard deviation and the day of issue. The batch certificates can also be retrieved online. The batch number consists of four digits. The first two numbers specify the production year, and the following two numbers specify the batch, e.g.: 18.01.
Features and Benefits:

• Complies with ISO 1042
• Manufactured from borosilicate glass 3.3
• UV protection due to external colouration; very durable and chemically resistant amber colour. The only external application of the colour ensures that internal surfaces have standard DURAN® glass properties.
• Outstanding precision during volumetric measurement and high-quality process stability
• Thanks to the exact processing and precisely calibrated scales, they permit the highly accurate determination and measurements of volume
• Supplied with ergonomic polyethylene stopper for easy and safe tightening or removal
• Calibration based on the poured in volume (“In”) at a + 20 °C reference temperature
• The volume content tolerances conform to accuracy Class A
• With etched graduation mark
• Fired-on, highly durable white print

Application: Storage and transport of light-sensitive materials, Measuring liquid amounts, Diluting solutions, Mixing several components, Measurement analysis, Volumetric measurement, To ensure a long service life for your volumetric glassware and to exclude possible volume changes, these glass products should not be heated above + 250 °C in drying cabinets or sterilisers.