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IS0
I N T E R N AT I ON A L O R G A N i Z AT I ON FOR STAN DARD I Z AT I O N
IS0 RECOMMENDATION
R 187
METHOD FOR THE CONDITIONING OF PAPER
AND BOARD TEST SAMPLES
1st EDITION
February 1961
COPY RIGHT 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 KO.
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 187, Method .for the Conditioning of Paper and Board Test
Samples, was drawn up by Technical Committee ISO/TC 6, Paper, the Secretariat of which is
held by the Association Française de Normalisation (AFNOR).
Work on this matterj which was begun by the Technical Committee in 1958, was comple-
ted in the same year with the adoption of a proposal as a Draft IS0 Recommendation.
On 10 July 1959, the Draft IS0 Recommendation (No. 313) was distributed to all the IS0
Member Bodies and was approved by the following Member Bodies:
Austria Greece Portugal
Belgium India Romania
Brazil Israel
Spain
Burma Japan Sweden
Chile Mexico Switzerland
Czechoslovakia Netherlands Turkey
Denmark New Zealand United Kingdom
Finland Norway U.S.S.R.
France Pakistan Yugoslavia
Germany Poland
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 1961, to accept it as an IS0 RECOMMENDATION.
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ISO/R 187 - 1961 (E)
IS0 Recommendation R 187 February 1961
METHOD FOR THE CONDITIONING OF PAPER
AND BOARD TEST SAMPLES
FOREWORD
This IS0 Recommendation describes a method which should be considered as the standard
method in the absence of any previous agreement.
The physical properties of paper are affected materially by its moisture content which, in turn, is
dependent on the humidity of the surrounding atmosphere. In order that tests may be made on
paper in a defined physical state, it is brought into equilibrium with an atmosphere of standardized
temperature and relative humidity and it is tested in that atmosphere.
The moisture content of a given paper in equilibrium with a given atmosphere varies according
to whether the equilibrium is reached by sorption or desorption of moisture. This hysteresis
influences those physical properties that change with moisture content; it is recommended that
the equilibrium condition be attained by a sorptive process.
1. OBJECT AND SCOPE
The object of this IS0 Recommendation is to define the conditioning atmosphere and the method
of conditioning paper and board before and during testing.
It applies to all papers and boards.
2. PRINCIPLE
To expose the samples to a conditioning atmosphere in such a manner that a state of moisture
content equilibrium is reached between the paper or board and this atmosphere.
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3. DEFINITIONS
3.1 Relative humidity (R.H.). Ratio of the absolute humidity of the air to the humidity of air
saturated with water vapour at the same temperature and pressure.
NOTE. The ratio is usually expressed as a percentage. At ordinary atmospheric temperatures, this ratio is
almost exactly equal to the ratio of the actual vapour pressure to the saturation vapour pressure at the same
(dry bulb) temperature.
3.2 Conditioning. For the purpose of this method, paper samples are conditioned when they
are in equilibrium with a conditionin
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