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IS0
I N T ERN AT I O N A L O RG A N I ZAT I ON FO R
STAND AR D I Z AT I ON
IS0 RECOMMENDATION
R 462
PLASTICS
RECOMMENDED PRACTICE FOR THE DETERMINATION
OF CHANGE OF MECHANICAL PROPERTIES
AFTER CONTACT WITH CHEMICAL SUBSTANCES
1st EDITION
November 1965
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The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorized therefore only
by the national standards organization of that country, being
a member of ISO.
For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organizations.
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BRIEF HISTORY
The IS0 Recommendation R 462, Recommended Practice for the Determinatiori of
Change of Mechanical Properties after Contact with Chemical Substances, was drawn up
by Technical Committee ISO/TC 61, Plastics, the Secretariat of which is held by the Ameri-
can Standards Association, Inc. (ASA).
Work on this question by the Technical Committee began in 1959 and led, in 1961,
.
to the adoption of a Draft IS0 Recommendation.
In June 1962, this Draft IS0 Recommendation (No. 511) was circulated to all the
IS0 Member Bodies for enquiry. It was approved by the following Member Bodies:
Australia Germany Romania
Austria Hungary Spain
Belgium India Sweden
Italy Switzerland
Chile
Colombia Japan U.S.A.
Czechoslovakia Mexico U.S.S.R.
Denmark New Zealand Yugoslavia
Finland Poland
Republic of South Africa
France
One Member Body opposed the approval of the Draft:
United Kingdom.
ice
The Draft IS0 Recommendation was then submitted by correspondence to the IS0
Council, which decided, in November 1965, to accept it as an IS0 RECOMMENDATION.
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lÇO/ R 462 - 1965 (E)
IS0 Recommendation R 462 November 1965
PLASTICS
RECOMMENDED PRACTICE FOR THE DETERMINATION
OF CHANGE OF MECHANICAL PROPERTIES
AFTER CONTACT WITH CHEMICAL SUBSTANCES
1. SCOPE
This IS0 Recommendation describes the procedure for measuring the change in the mechanical
properties of plastics after immersion in chemical substances. This method is intended for the
testing of all organic plastic materials, such as cast, extruded, calendered, moulded, laminated
products, both flexible and rigid, sheet, rod and tube materials.
2. SIGNIFiCANCE OF TEST
2.1 This method is only suitable for the comparison of the behaviour of different plastics after
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immersion in chemical substances, in liquid form or in solution.
2.2 This comparison is carried out by measuring certain mechanical properties of the material
before and after immersion in chemical substances.
2.3 The choice of the mechanical properties to be measured is determined according to the
type of material and its foreseen applications.
2.4 The choice of reagents, temperature and duration of test is necessarily arbitrary; the list
of reagents reported in section 6 serves primarily as a guide to investigators wishing to
compare the relative resistance to chemicals of different plastics and to have a first assessment
of their behaviour in respect to certain groups of chemical substances.
3. APPARATUS
The apparatus consists of the following:
(a) Containers: suitable jars or beakers; the dimensions should be proportionate to the
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test specimeiis; one container is provided for each test specimen.
Thermostatic enclosures, suitable for maintaining the containers with the chemical
(h)
reagents and the specimens at the test temperature (see clause 7.5).
(c) Apparatus for the determination of the mechanical properties to be measured; they
should correspond to those described in the different IS0 Recommendations referring
to the mechanical property under consideration.
4. TEST SPECIMENS
The test specimens should be identical with those required in the specific IS0 Recommendation
referring to the mechanical property under consideration.
5. CONDïïIONING TEST SPECIMENS
The test specimens should be conditioned according to IS0 Recommendation R 291, Plastics
- Standard Atmospheres for Conditioning and Testing.
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iSO/ R 462 - 1965 (E)
6. REAGENTS
The same reagents should be used as those described in section 7 of IS0 Recommendation
R 175, Plastics-Determination of the Resistance of Plastics to Chemical Substances.
7. PROCEDURE
7.1 For each of the selected reagents and temperatures, the number of test specimens required
for mechanical test in accordance with the applicable IS0 Recommendation are prepared.
In addition, a sufficient number of test specimens for blank tests are prepared and, if the
effects of extraction of plasticizers or other soluble components are to be determined (see
clause 7. lo), duplicate test specimens are prepared for this purpose.
7.2 If necessary, the dimensions of the test specimens are measured, as required by the applicable
IS0 Recommendation.
7.3 Each test specimen, after conditioning, is placed in a separate container and totally immersed
in the reagent. It is placed in such a position that it is compl
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