ISO 3993
DETERMINATION OF DENSITY OR RELATIVE DENSITY OF LIGHT HYDROCARBONS - PRESSURE HYDROMETER METHOD.
This International Standard specifies a method for the determination of density or relative density of liquefied petroleum gases and other light hydrocarbons. The prescribed apparatus shall not be used for materials having gauge vapour pressures higher than 1,4 MPa1) (14 bar) (absolute vapour pressure 1,5 MPa) at the test temperature.