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8130-2
STANDARD
First edition
1992-12-01
Coating powders -
Part 2:
Determination of density by gas comparison
pyknometer (referee method)
Poudres pour revetement -
Partie 2: Determination de la masse volumique A I’aide d’un pycnometre
5 gaz (mtithode de rkfbrence)
Reference number
IS0 8130-2:1992(E)
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IS0 8130-2:1992(E)
Foreword
IS0 (the International Organization for Standardization) is a worldwide
federation of national standards bodies (IS0 member bodies). The work
of preparing International Standards is normally carried out through IS0
technical committees. Each member body interested in a subject for
which a technical committee has been established has the right to be
represented on that committee. International organizations, govern-
mental and non-governmental, in liaison with ISO, also take part in the
work. IS0 collaborates closely with the International Electrotechnical
Commission (IEC) on all matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are
circulated to the member bodies for voting. Publication as an Interna-
tional Standard requires approval by at least 75 % of the member bodies
casting a vote.
International Standard IS0 8130-2 was prepared by Technical Committee
ISO/TC 35, Paints and varnishes, Sub-Committee SC 9, General test
methods for paints and varnishes.
IS0 8130 consists of the following parts, under the general title Coating
powders:
- Part I: Determination of particle size distribution by sieving
- Part 2: Determination of density by gas comparison pyknometer
(referee method)
- Part 3: Determination of density by liquid displacement
pyknometer
- Part 4: Calculation of lower explosion limit
- Part 5: Determination of flow properties of a powder/air mixture
- Part 6: Determination of gel time of thermosetting coating powders
at a given temperature
- Part 7: Determination of loss of mass on stoving
- Part 8: Assessment of the storage stability of thermosetting pow-
ders
0 IS0 1992
All rights reserved. No part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without
permission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-1211 Get-he 2Q l Switzerland
Printed in Switzerland
ii
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IS0 8130=2:1992(E)
- Part 9: Sampling
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INTERNATIONAL STANDARD IS0 8130=2:1992(E)
Coating powders -
Part 2:
Determination of density by gas comparison pyknometer
(referee met hod)
IS0 842:1984, Raw materials for paints and varnishes
1 Scope
- Sampling.
This part of IS0 8130 specifies a method for the de-
termination of the density of coating powders using
3 Principle
a gas comparison pyknometer. It can be used for ail
types of coating powder, is simple to carry out, but
The volume of a weighed test portion is determined
requires more expensive instrumentation than is of-
by measuring the volume of gas displaced within a
ten used for density determinations.
receptacle when the test portion is introduced. This
is achieved by equalizing the pressure difference
The density of coating powders can also be deter-
which arises due to the displacement of the gas. The
mined using the liquid displacement pyknometer
density is then calculated from the mass and the
method described in IS0 8130-3. The apparatus is
volume of the test portion.
relatively inexpensive, but the liquid displacement
pyknometer method is liable to give erroneous re-
sults, particularly if the powder swells in contact 4 Material
with the displacement liquid used or the displace-
ment liquid does not totally displace the air between
4.1 Air or, if desired, helium, commercial grade, in
the powder particles. The liquid displacement
a steel cylinder.
method is much slower in execution, less accurate
and is only to be used if it can be shown that the
Other gases may be used provided that the product
same results will be obtained as for the gas com-
under test is not affected and this deviation from the
parison pyknometer method.
method is noted in the test report.
5 Apparatus
5.1 Gas comparison pyknometer, for the manual or
automatic determination of the density, complying
2 Normative refere
...