ISO 2884:1974
(Main)Paints and varnishes — Determination of viscosity at a high rate of shear
Paints and varnishes — Determination of viscosity at a high rate of shear
Describes a procedure for determining the viscosity of coating materials and related products at a rate of shear not less than 5000 s-1 and not higher than 20000 s-1. When products are being compared the rate of shear shall be approximately the same. The test shall be made at a closely controlled temperature unless otherwise agreed. The value obtained gives information about the resistance of the material to brushing during the initial application. The method is suitable for all brushing paints and varnishes. More reproducible for paints having low values for fineness of grind as determined by ISO 1524.
Peintures et vernis — Détermination de la viscosité des peintures à gradient de vitesse élevé
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INTERNATIONAL STANDARD
INTERNATIONAL ORGANlZATlON FOR STANDARDIZATION l MEX~YHAPOAHAJI OPI-AHM3AWR I-IO CTAHAAPTki3ALJMM *ORGANISATION INTERNATIONALE DE NORMALISATION
Paints and varnishes - Determination of viscosity
at a high rate of shear
. .
I
Determination de la viscosite des pein tures 2 gradien t de vitesse Gleve’
Pein tures et vernis -
First edition - 1974-02-15
UDC 667.612.33 : 620.195.25
Ref. No. ISO 2884-1974 (E)
Desctiptors : paints, varnishes, tests, viscosity, dynamic viscosity.
Price based on 2 pages
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FOREWORD
ISO (the International Organization for Standardization) is a worldwide federation
of national Standards institutes (ISO Member Bodies). The work of developing
International Standards is carried out through ISO Technical Committees. Every
Member Body interested in a subject for which a Technical Committee has been set
up has the right to be represented on that Committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work.
Draft International Standards adopted by the Technical Committees are circulated
to the Member Bodies for approval before their acceptance as International
Standards by the ISO Council.
International Standard ISO 2884 was drawn up by Technical Committee
ISOßC 35, Pakts and varnishes, and circulated to the Member Bodies in
July 1972.
lt has been approved by the Member Bodies of the following countries :
Austral ia India South Africa, Rep. of
Brazil Iran Sweden
Canada I reland Switzerland
Czechoslovakia Israel Thailand
Denmark New Zealand Turkey
Egypt, Arab Rep. of Poland United Kingdom
France Portugal U.S.A.
Germany Romania U.S.S.R.
The Member Body of the following country expressed disapproval of the
docu ment on technical grou nds
I taly
0 International Organization for Standardization, 1974 l
Printed in Switzerland
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ISO 2884-1974 (E)
INTERNATIONAL STANDARD
Determination of viscosity
Paints and varnishes -
at a high rate of shear
0 INTRODUCTION 2 APPARATUS
This International Standard is one of a series dealing with
Viscometer of the cone and plate or concentric cylinder
the testing of paints, varnishes and related products. it
type, working at a rate of shear in the range of 5 000 to
should be read in conjunction with ISO 1512, Paints and 20 000 s-
‘= The description of the actual apparatus used
varnishes - Sampling, ISO 15 13, Paints and varnishes - shall be agreed between the interested Parties, and the
Examination and preparation of samples for testing and details given in the test report.
ISO 1524, Paints and varnishes - Determination of fineness
of grind.
3 SAMPLING
A representative Sample of the product to be tested shall be
lt Supplements ISO 2431, Paints and varnishes - Determi-
taken as described in ISO 1512. The Sample shall then be
nation of flow time by use of a flow CUP.
examined and prepared for testing as described in
ISO 1513. The Sample shall in all cases be strained through
a sieve of nominal aperture size 125 Pm into a clean
Container. The volume of the Sample shall be sufficient to
fill the viscometer.
1 SCOPE AND FIELD OF APPLICATION
This International Standard specif ies the general procedure 4 CHECKING OF THE APPARATUS
to be followed in determining the dynamic viscosity of
Check the apparatus daily when in regular use, or otherwise
paints, varnishes and related products at a rate of shear not
before use, by carrying out the test as outlined in 6,1 using
less than 5 000 s-l- and not higher than 20 000 &When
refined mineral oils having NeuFtonian
Standard
the viscosities of products are being compared the
characteristics and known viscosities’) . If the readings
rate of shear shall be approximately the Same. The
obtained differ from the known viscosities of the standard
determination shall be made at a closely controlled
oils by more than 5 %, the apparatus should be checked by
temperature, 23 If: 0,2 “C unless otherwise agreed.
a competent instrument engineer or returned to the maker
for adjustment.
The value obtained gives information about the resistance
of the material to brushing during the initial application
5 CHECKING OF TEMPERATURE CONTROL
period; no information is obtained, however, on the changes
resulting from evaporation of solvents from the paint.
lt is important that the temperature does not Change during
the de
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