Water standard 1%

Standard for volumetric Karl Fischer Titration 1 g ≙ 10 mg H₂O Aquastar®

storage conditions

no restrictions.

Quality Level


ISO (17025, 17034)

product line




autoignition temp.

287 °C (DIN 51794,Information refers to the main component.)

expl. lim.

1.7 % (v/v)


Karl-Fischer titration: suitable
titration: suitable


119 °C/1013 hPa


-95 °C

transition temp

flash point 31 °C (Information refers to the main component.)


0.92 g/cm3 at 20 °C

storage temp.


Related Categories

General description

Water standard 1% is prepared using high-purity water and 1-methoxy-2-propanol by the gravimetric method. Its characterization is carried out at an accredited quality control (QC) laboratory according to DIN EN ISO/IEC 17025. The water content of the standard is measured by direct coulometric Karl Fischer titration, in accordance with ISO 760.


Water standard 1% can be used for:
  • Evaluating the accuracy of coulometric Karl Fischer titrators according to ISO 9001 chapter 7.1.5 “Monitoring and measuring resources” as a Certified reference material (CRM)
  • Checking the accuracy of measured results according to European Pharmacopeia (Ph.Eur.) chapter 2.5.32 “Water Micro Determination”
  • Standardizing titrants according to European Pharmacopeia (Ph.Eur.) chapter 2.5.12 “Water Semi-Micro Determination” and the United States Pharmacopeia <921> “Water Determination”
  • Titer determinations using volumetric method with one component and two component reagents

Features and Benefits

  • Packed in convenient 8 mL glass ampoules and 10 single-use ampoules in a box
  • Supplied with a batch-specific certificate of analysis (CoA) having data on the exact measured water content of the batch, uncertainty, method of analysis, the NIST batch, and minimum shelf life
  • Measured and qualified in an ISO/IEC 17025 and ISO 17034 accredited calibration laboratory
  • Directly traceable to SI unit (kg) and verified by SRM 2890 from NIST


SKU-pack size numbers ending with a "3" are SmartChemicals with an RFID tag on the label for seamless data transfer to the instrument, e.g. xxxxxx1003 or xxxxxxx 4003. More information on www.sigmaaldrich.com/SmartChemicals

Analysis Note

Assay (H₂O): 9.90 - 10.10 mg/g

Legal Information

AQUASTAR is a registered trademark of Merck KGaA, Darmstadt, Germany


FlameExclamation mark

Signal Word


Hazard Statements


Flam. Liq. 3 - STOT SE 3

Target Organs

Central nervous system


3 - Flammable liquids

WGK Germany


Flash Point(F)

87.8 °F - Information refers to the main component.

Flash Point(C)

31 °C - Information refers to the main component.

Certificate of Analysis

Certificate of Origin

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