ISO 2555:1974
(Main)Resins in the liquid state or as emulsions or dispersions — Determination of Brookfield RV viscosity
Resins in the liquid state or as emulsions or dispersions — Determination of Brookfield RV viscosity
Résines à l'état liquide ou en émulsions ou dispersions — Détermination de la viscosité Brookfield RV
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INTERNATIONAL STANDARD @ 2555
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INTERNATIONAL ORGANIZATION FOR STANDARDIZATION *MEWlYHAWLlHAR OPrAHM3AUMR no CTAHLiAPTM3AUUM -ORGANISATION INTERNATIONALE DE NORMALISATION
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Resins in the liquid state or as emulsions or dispersions -
Determination of Brookfield RV viscosity
*
Résines à l’état liquide ou en émulsions ou dispersions - Détermination de la viscosité Brookfield R V
First edition - 1974-06-01
UDC 678.6/.7 : 54-14 : 532.13 Ref. No. IS0 2555-1974 (E)
Descriptors : resins, viscosity index, determination, viscometers
Price based on 6 pages
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FOREWORD
IS0 (the International Organization for Standardization) is a worldwide federation
of national standards institutes (IS0 Member Bodies). The work of developing
International Standards is carried out through IS0 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 nongovernmental, 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 IS0 Council.
International Standard IS0 2555 (originally ISO/DIS 2555 and Addendum I) was
drawn up by Technical Committee ISO/TC 61, P/astics, and circulated to the
Member Bodies in November 1971 (Addendum I was circulated in June 1972).
ISO/DIS 2555 has been appr8ved by the Member Bodies of the following countries:
Australia Hungary South Africa, Rep. of
Belgium India Spain
Sweden
Brazil Italy
Japan Switzerland
Canada
Czechoslovakia New Zealand Thailand
Egypt, Arab Rep. of Poland Turkey
Finland Portugal U.S.A.,
France Romania U S.S. R.
The Member Bodies of the following countries expressed disapproval of the
document on technical grounds :
Germany
United Kingdom
ISO/DIS 2555/Addendum I has been approved by the Member Bodies of the
following countries :
Ireland Spain
Austria
Israel Sweden
Belgium
Italy Switzerland
Brazil
Japan Thailand
Canada
New Zealand Turkey
Czechoslovakia
France Poland U S.A.
Hungary Portugal U.S.S.R.
India Romania
Iran South Africa, Rep. of
The Member Bodies of the following countries expressed disapproval of the
Addendum on technical grounds :
Germany
Nether I a nds
United Kingdom
O International Olganization for Standardization, 1974
Printed in Switzerland
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IS0 2555-1974 (E)
INTERNATIONAL STAN DARD
Resins in the liquid state or as emulsions or dispersions -
Determination of Brookfield RV viscosity
The resistance exerted by the fluid on the spindle, which
1 SCOPE AND FIELD OF APPLICATION
depends on the viscosity of the product, causes the
tightening of a spiral spring which is indicated by the
This International Standard specifies a method of
movement of a needle on a dial.
determining the viscosity, which is conventionally called
"Brookfield viscosity", of resins in a liquid or similar state,
using one of the rotation spindle types of Brookfield
"Brookfield viscosity" is obtained by multiplying this dial
viscometers, RV Models.
reading by a coefficient which depends on the speed of
rotation and characteristics of the spindle.
The application of this International Standard to each of
the products given in the title (liquids, emulsions,
dispersions) requires another document which prescribes The products to which this International Standard is
the measurement of this Brookfield RV viscosity and applicable are generally non-newtonian and the measured
specifies particular conditions for the pertinent product, viscosity depends on the velocity gradient to which the
particularly the speed-spindle combination. product is subjected during the measurement.
be one of the following :
This document can
With these types of viscometers the velocity gradient is not
a) An annex to the present International Standard,
the same for every point of the spindle. Thus, for a
covering a product or group of products (for example
non-newtonian fluid, the result is not strictly the true
annex A devoted to liquids).
"viscosity at a known velocity gradient" and therefore is
conventionally called "Brookfield RV viscosity".
b) An International Standard for the designation or
specification of a product;
c) A national standard or commercial contract.
3 APPARATUS
The Brookfield viscometers, RV models, permit viscosity
measurements from 0.02 Pas (20 cP) to 8 O00 Pa.s
3.1 Brookfield synchro-lectric viscometer, RV model
(8 X 106 cP).
(RVF, RVF-100 or RVT), chosen according to the product
to be tested and the desired experimental accuracy.
2 PRINCIPLE
A spindle, of cylindrical or related form (disc), is driven by
The detailed working principle of this apparatus, its
a synchronous motor at a constant speed in the product description and the characteristics of these three types are
being studied. given in annex B.
1
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IS0 2555-1974 (E)
Each viscometer consists of : 3.3 Additional apparatus
- viscometer body;
3.3. Support, which holds the viscometer and moves it in
- seven interchangeable spindles numbered from 1 to 7 a vertical plane.
(number 1 being the largest); these spindles carry a mark
which indicates the immersion level in the liquid; they
3.3.2 Beaker,90to 92 mm in diameter and
are the same for the three types of viscometer;
115 to 160 mm in height.
- guard stirrup, detachable.
3.3.3 Therrnorneter,graduated in 0.1 OC, to measure the
temperature of the product being tested.
The rotation speeds available on the three types of the RV
model of the Brookfield viscometer are :
4 CHOICE OF SPEED AND SPINDLE
Type Speed in rev/min
Choose the speed-spindle combination taking into account
the value of the viscosity to be measured, the desired
RVF 2 4 10 20
precision and the velocity gradient.
RVF-100 10 20 50 100
It is necessary to make this choice in such a way that no
RVT 0.5 1 2.5 5 10 20 50 100
measurement corresponds to less than 20 % or more than
95 % of full scale deflection. However, for the best
The shapes and sizes of the spindles are such that the
accuracy it is advisable to keep to the range 45 to 95 % of
Brookfield RV viscosities corresponding to a maximum
full scale.
deflection of the needle on the dial, for the various speeds,
are those given in table 1.
NOTE - If a comparison of viscosities between non-newtonian
products is desired, it is necessary to use the same speed-spindle
combination for all the measurements, even if the accuracy of one
TABLE 1 - Brookfield RV viscosities
of the measurements is markedly decreased.
The choice of speed automatically involves the choice of
Viscosity in Pa%corresponding to full
one or more types of viscometer. In this connection, it is
Virx>mettei II Speed scale deflection for spindle number
recommended to use, if possible speeds of
10 and 20 rev/min, which are the only ones common to the
three types.
Note that the RVF type has a lower limit around 0,l Pa.s
(100 cP) while the RVF-100 and RVT types have a lower
limit around 0,02 Pa.s (20 cP).
The speed-spindle combination to be used must be specified
in the document which prescribes the measurement (see
clause 1). The choice may be made in terms of the stated or
expected Brookfield viscosity, using table 1 and noting that
the most suitable range is between 45 and 95 OJO of full
scale.
5 PROCEDURE
Mount the viscometer, with its guard stirrup, on its support.
NOTE - 1 Pas = lo3 CP
Fill the beaker (3.3.2) with the product to be tested, taking
care not to introduce air bubbles, then put it inOthe water
The adjustment and calibration of these viscometers is
bath thermostatically controlled within f 0,2 C, for a
usually carried out by the manufacturer of the apparatus.
sufficient time to reach the desired temperature. If the
product contains volatile matter or is hygroscopic, take care
It is recommen
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