SIST EN ISO 9371:1999

SLOVENSKI STANDARD
SIST EN ISO 9371:1999
01-maj-1999
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Plastics - Phenolic resins in the liquid state or in solution - Determination of viscosity
(ISO 9371:1990)
Kunststoffe - Phenolharze, flüssig oder Lösung - Bestimmung der Viskosität (ISO
9371:1990)
Plastiques - Résines phénoliqes liquides ou en suspension - Détermination de la
viscosité (ISO 9371:1990)
Ta slovenski standard je istoveten z: EN ISO 9371:1995
ICS:
83.080.10 Duromeri Thermosetting materials
SIST EN ISO 9371:1999 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 9371:1999

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SIST EN ISO 9371:1999

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SIST EN ISO 9371:1999

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SIST EN ISO 9371:1999
IS0
I N TE R NAT1 O NA L
9371
STANDARD
First edition
1990-1 2-1 5
Plastics - Phenolic resins in the liquid state or
in solution - Determination of viscosity
Plastiques - Résines phérioliques liquides ou en solution -
Détermination de la viscosité

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SIST EN ISO 9371:1999
IS0 9371 :1990(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.
I
International Standard IS0 9371 was prepared by Technical Committee
ISO/TC 61, Plastics.
Annexes A and B form an integral part of this International Standard
1
O IS0 1990
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 CH-1211 Genéve 20 * Switzerland
Printed in Switzerland

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SIST EN ISO 9371:1999
IS0 9371:1990(E)
INTERNATIONAL STANDARD
Plastics - Phenolic resins in the liquid state or in solution -
Determination of viscosity
IS0 2555:1989, Plasiics - Resins in the liquid state
1 Scape
or as emulsions or dispersions - Determination of
apparent viscosity by the Brookfield Test method.
This International Standard specifies four methods
for the determination of the viscosity of phenolic re-
IS0 3105:1976, Glass capillary kinematic viscometers
sins, either as a liquid or in solution.
-- Specification and operating instructions.
It describes the following two types of method:
IS0 3219:1977, Plastics -- Polymers in the liquid,
a) Reference methods: emulsified or dispersed state -- Determination of
viscosity with a rotational viscometer working at de-
fined shear rate.
1) Determination using a viscometer with a def-
inite speed gradient
2) Determination using an Ubbelohde capillary
viscometer 3 General (valid for all four methods)
b) Comparative test methods: Test temperature
Unless specified otherwise, determinations shall be
1) Determination using a rotary viscometer
performed at 23 "C within the tolerance allowed in
the method used.
2) Determination using a tioeppler dropping-ball
vi çcom et er
Dissolving solid resins
Other methods may be used as long as it is verified
The solvent used and the concentration chosen shall
that the same test results are obtained.
be agreed between the parties concerned
Expression of results
Dynamic viscosities shall be expressed in
millipascal seconds (mPa s), kinematic viscosities in
square millimetres per second (rnm*/s)
2 Normative references
4 Reference methods
The following standards contain provisions which,
through reference in this text, constitute provisions
4.1 Viscosity determination using a
of this International Standard. At the time of publi-
cation, the editions indicated were valid. All stan- definite speed gradient
viscometer with
to revision, and parties to
dards are subject
agreements based on this International Standard The specifications of IS0 3219 shall be followed, ei-
are encouraged to investigate the possibility of ap- ther to determine the viscosity at a definite speed
plying the most recent editions of the standards in- gradient, or to perform a rheological study of the
dicated below. Members of IEC and IS0 maintain resin and, in particular, to obtain a curve of viscosity
registers of currently valid International Standards. as a function of the speed gradient.
1

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SIST EN ISO 9371:1999
IS0 9371:1990(E)
4.2.4 Apparatus
4.2 Determination using an Ubbelohde
capillary viscometer
4.2.4.1 Ubbelohde viscometer, with design details
and construction as shown in figure 1. Table 1 gives
4.2.1 Scope
the approximate C'-constants (see annex A), the di-
ameter of the capillaries and the corresponding vis-
This sub-clause specifies a method of test, for ref-
cosity ranges. Bulb C has a volume of 4 ml for a
erence purposes, for the determination of the
viscometer whose constant is between 0,Ol mm2/s2
kinematic viscosity of liquid phenolic resins, or re-
and 0,05 mm?s2, 5 ml for a constant from
sins dissolved in an appropriate solvent at a given
0,2 mm2/s2 to 1,0 mm2/s2 and 6 ml for a constant
concentration chosen by agreement between the
between 3,O mm2/s2 to 10,O mrnVs2.
parties concerned. The method is suitable for de-
termining kinematic viscosity over the range
The viscometer shall be fitted with supports de-
2 mmVs to 10000 mm*/s.
signed to hold the various tubes which make up the
viscometer in a vertical position as required by the
NOTE 1 Kinematic viscosity is a property of newtonian
met hod.
fluids. As resins and resin solutions are non-newtonian,
the determination of the viscosity by this method will give
The filler marks (G and H) on bulb A indicate the
an apparent viscosity which will depend on the specific
minimum and maximum quantities providing the
conditions used.
pressure necessary for correct functioning
4.2.2 Normative reference
4.2.4.2 Thermoregulated bath, of such a design that
the viscometer can be immersed in it so that bulb
IS0 653:1980, Long solid-stem thermometers for
C above the top of the capillary is at least 30 mm
precision use.
below the surface of the liquid in the bath, but the
tube and thermometer are both visible. A rigid sup-
4.2.3 Principle
port shall be provided to maintain the tube vertically
to within 1".
The determination involves measuring the time re-
quired by a fixed volume of liquid resin or resin sol- The bath shall be fitted with a heater and stirrer ca-
ution, contained in the bulb of a glass viscometer, to pable, between them, of maintaining the bath at a
flow under gravity through a calibrated capillary un- temperature of 23 "C k 0,l "C along the entire
der a reproducible driving head of liquid at a closely length of the viscometer and from one viscometer
controlled temperature. tube to another.
Table 1 - Dimensions, appraximate C-constants and kinematic-viscosity ranges af the Ubbelohde viscometer
Utilisation range
Internal diameter of
Approximate C-constant Volume of bulb C
capillary
Kinematic viscosity
mm2/s2 mm (5 2 YO) mi (5 5 YO) mrn2/s *)
0,5a 4 2 to 10
4
0,7a 6 to 30
0,88 4 ?O to 50
1 ,O3 5 20 to 100
1,36 5 60 to 300
1,55 5 100 to 500
1.83 5 200 to 1 O00
2,43 6 GOO to 3 O00
2,75 6 1 O00 to 5 O00
6
3,27 2 O00 to 10 O00
*) i mm2/s = i cst
2

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SIST EN ISO 9371:1999
IS0 9371:1990(E)
Dimensions in millimetres
M
O
Ln
f
f
O
cv
E
0-
--
O
ch
O
M
O
cv
Figure 1 - Details of Ubbelohde viscometer

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SIST EN ISO 9371:1999
IS0 9371:1990(E)
Immerse the viscometer in the bath (4.2.4.2), using
4.2.4.3 Filter funnel, with sintered-glass disc, me-
the support to ensure the viscometer is vertical.
dium porosity (average pore diameter between
40 pm and 50 pm).
Maintain the bath ternperature at 23 "C f 0,l OC.
Allow the filled viscometer to remain in the bath long
enough to reach 23 "C 5 0,l "C. Place a finger over
4.2.4.4 Stopwatch, accurate to 0,l s
tube M and apply suction to the top of tube N to draw
liquid up tube N until it reaches the centre of bulb
D.
4.2.4.5 Long-stem thermometer, covering the range
from 20 "C to 45 "C, graduated at intervals of not
Disconnect the suction from tube N, remove the fin-
more than 0,l "C, in accordance with IS0 653
ger from tube M and place it immediately on tube N
(STL/O, 1/20/45).
until the liquid in and below tube M has drained
clear from the bottoin end of the capillary (R). Re-
move the finger from tube N and, using the
4.2.4.6 Means of applying sufficient vacuum, to the
stopwatch (4.2.4.4), measure, to within 0,l s, the time
top of tube N to raise the resin or resin-solution level
to pass from the first mark
required for the meniscus
to the level in bulb C required by the test procedure
(E) to the second (F). A flow time of at least 200 s is
(see 4.2.5.3).
required. If the flow time is less than 200 s, select a
viscometer with a finer capillary and repeat the test.
Run the determination in duplicate with different test
4.2.5 Procedure
samples.
4.2.5. Viscometer calibration
4.2.6 Expression of results
Calibrate the viscometer (4.2.4.1) before using it for
the first time, then periodically (see annex A). Con-
The kinematic viscosity V, expressed in square
stants are usually provided with viscometers, but it
millimetres per second, is given by the equation
is advisable to check them.
v = C(1, - AI)
where
4.2.5.2 Viscometer cleaning
(,' is the viscometer constant, expressed in
Initially, then periodically, clean the viscometer with
square millirnetreç per second squared
a chromic acid cleaning solution. The cleaning sol-
(see clause A.1);
ution shall be kept in the viscometer for at least
12 h at ambient temperature, although this time may
is the flow-time, expressed in seconds;
fn,
be shortened if the temperature is higher. Then
empty the viscometer and rinse it first with Af is the flow-time correction. exwessed in
..
deionized distilled water followed by acetone, finally seconds (see clause A.2).
drying it with stream of dry, filtered air.
Calculate the arithmetic mean of the two determi- e
Clean the viscometer thoroughly between nations. In the case where they differ by more than
measurements by rinsing with a suitable highly vol- 5 in relative value, repeat the determination in
atile solvent. Dry the viscometer by passing a slow duplicate with different test samples.
stream of dry, filtered air through it for 2 min, or until
all traces of solvent are eliminated.
4.2.5.3 Determination of viscosity
5 Comparative test methods
Fill the viscometer (4.2.4.1) with resin or resin sol-
ution, tilting the instrument about 30" out of vertical,
keeping bulb A (see figure 1) below the capillary,
and passing the liquid through the sintered-glass
5.1 Viscosity determination using a rotary
filter funnel (4.2.4.3).
viscome
...