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Water standard 1%

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

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


single component solution

storage temp.


General description

Water standard 1% is prepared using high-purity water and reagents 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

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

Hazard Classifications

Flam. Liq. 3 - STOT SE 3

Target Organs

Central nervous system

Storage Class Code

3 - Flammable liquids



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

Enter Lot Number to search for Certificate of Analysis (COA).

Certificate of Quality

Enter Lot Number to search for Certificate of Quality (COQ).

More Documents

Quotes and Ordering


Titration 4.0

SmartChemicals enable wireless transfer of CoA data stored on an RFID tag on the consumable bottle to the titrator, reducing effort and chance for human error. Crucial data required for the application is transmitted safely, reliably and intelligently to the instrument.


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