PAINTS AND VARNISHES - COATING
POWDERS -
PART J2: DETERMINATION OF DENSITY BY
GAS COMPARISON PYKNOMETER
(REFEREE METHOD)
(ISO 8130-2:1992 (2007), MOD)
This part of ISO 8130 specifies a method for the determination of the density of coating powders using
a gas comparison pyknometer. It can be used for ail
types of coating powder, is simple to carry out, but
requires more expensive instrumentation than is often used for density determinations.
The density of coating powders can also be determined using the liquid displacement pyknometer
method described in ISO 8130-3. The apparatus 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, less accurate
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 ISO 842:1984, Raw materials for paints and varnishes
- Sampling
