ISO 649-1:1981 Preview
Laboratory glassware -- Density hydrometers for general purposes -- Part 1: Specification
This standard was last reviewed and confirmed in 2010. Therefore this version remains current.
The requirements for basic series and sub-series of glass hydrometers of constant mass without built-in thermometer are specified. They are graduated to indicate density at 20 degrees centigrade and 15 degrees centigrade, respectively. Standard categories of surface tension are tabled in annex A, recommended stem diameters in annex B.
Buy this standard
A standard is reviewed every 5 years
Revisions / Corrigenda
Now under review