DURAN® Volumetric Flask, Class A, USP conformity <31>, with USP individual certificate and CoC, with graduation mark and ergonomic polyethylene stopper, blue print, 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. The volumetric flasks are labelled with an individual number. This is permanently laser-etched onto the base of the volumetric flask and is entered on the corresponding certificate. The accuracy limits for USP compliant volumetric flasks are stricter than flasks conforming to ISO 1042 and therefore satisfy the requirements of the United States Pharmacopoeia (USP). The volume measured for the corresponding volumetric flask, the measurement uncertainty and the day of issue are documented on this certificate.
Features and Benefits:

• Complies with ISO 1042
• Manufactured from borosilicate glass 3.3
• 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 printed ring mark for better visibility
• Fired-on, highly durable blue print

Application: Preparation and storage of standard solutions, 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.