PAINTS AND VARNISHES - COATING
POWDERS - PART J3: DETERMINATION OF
DENSITY BY LIQUID DISPLACEMENT
PYKNOMETER
(ISO 8130-3:1992 (2007), MOD)
This part of ISO 8130 specifies a liquid displacement
pyknometer method for the determination of the
density of coating powders. The method is based on
a determination of the mass and the volume of a test
portion.
The apparatus specified is relatively inexpensive,
but the liquid displacement pyknometer method is
liable to give erroneous results, particularly if the
powder swells in contact with the displacement liquid used or the displacement liquid does not totally
displace the air between the powder particles. The
liquid displacement method is much slower in execution and less accurate than the gas comparison
pyknometer method specified in ISO 8130-2 and is
only to be used if it can be shown that the same results will be obtained as for the gas comparison
pyknometer method
