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UDC ô2û.l: 551.58.001.1
IS0
I NT ERN AT1 ON A L ORGAN I ZAT I ON
FOR STAN DARD I ZAT I O N
IS0 RECOMMENDATION
R 558
CONDITIONING ATMOSPHERE
TEST ATMOSPHERE
REFERENCE ATMOSPHERE
DEFINITIONS
1st EDITION
February 1967
COPYRIGHT RESERVED
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
Copies to be obtained through the national standards organizations.
Also issued in French and Russian.
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BRIEF HISTORY
The IS0 Recommendation R 558, Conditioning Atmosphere - Test Atmosphere - Reference
Atmosphere - Dejnitions, was drawn up by Technical Committee ISO/TC ATCO, the Secretariat
of which is held by the Association Française de Normalisation (AFNOR).
Work on this question by the Technical Committee began in 1958 and led, in 1960, to the
adoption of a Draft IS0 Recommendation.
In April 1963, this Draft IS0 Recommendation (No. 555) was circulated to all the IS0
Member Bodies for enquiry. It was approved, subject to a few modifications of an editorial
nature, by the following Member Bodies :
Australia Hungary Portugal
Belgium India Romania
Sweden
Brazil Indonesia
Switzerland
Burma Iran
Chile Italy U.A.R.
Czechoslovakia Japan United Kingdom
France Mexico U.S.A.
Germany Netherlands U.S.S.R.
Yugoslavia
Greece Norway
No Member Body opposed the approval of the Draft.
The Draft IS0 Recommendation was then submitted by correspondence to the IS0
Council, which decided, in February 1967, to accept it as an IS0 RECOMMENDATION.
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ISO/R 558- 1967 (E)
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IS0 Recommendation R 558 February 1967
CONDITIONING ATMOSPHERE
TEST ATMOSPHERE
REFERENCE ATMOSPHERE
DEFINITIONS
INTRODUCTION
The test conditions laid down should take into account the objective in view. This may be
- a specific objective: to study the behaviour of a given material, component or equipment,
to determine its suitability;
- or a general objective : to obtain, under identical conditions, reproducible results suitable
for comparing the characteristics of a given material, component or equipment.
Suitability
To determine the effect on a material, component or equipment, of the climatic, mechanical or
other conditions under which it will be used, it may be necessary to test it under the extreme
conditions which it may encounter in use, or even to test it under conditions differing greatly
from ordinary ambient conditions (for an accelerated ageing test,
...