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IS0
I N T ER N AT1 ON A L ORGAN I Z AT1 O N FOR STAND AR D I ZAT IO N
IS0 RECOMMENDATION
R 638
PULPS
DETERMINATION OF DRY MATTER CONTENT
1st EDITION
November 1967
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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 638, Pulps- Determination of dry matter content, was drawn
up by Technical Committee ISO/TC 6, Paper, board and puips, the Secretariat of which is held
by the Association Française de Normalisation (AFNOR).
Work on this question by the Technical Committee began in 1961 and led, in 1965, to the
adoption of a Draft IS0 Recommendation.
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In November 1965, this Draft IS0 Recommendation (No. 870) 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 :
Argentina India Romania
Australia Iran South Africa,
Austria Ireland Rep. of
Belgium Israel Spain
Brazil Italy Sweden
Canada Japan Switzerland
Chile Korea, Rep. of Turkey
Czechoslovakia Netherlands U.A.R.
Denmark New Zealand United Kingdom
Finland Norway U.S.A.
France Poland U.S.S.R.
Germany Portugal Yugoslavia
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 November 1967, to accept it as an IS0 RECOMMENDATION.
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ISO/R 638 - 1967 (E)
IS0 Recommendation R 638 November 1967
PULPS
DETERMINATION OF DRY MATTER CONTENT
1. PURPOSE
This IS0 Recommendation describes a method for the determination of the dry matter content in
Pulp-
2. SCOPE
This method applies to moist or air-dry pulp which does not contain any appreciable quantity
of matter, other than water, volatile at the specified temperature. It is used, for example, with
pulp samples taken for chemical and physical tests in the laboratory which require concurrent
determination of dry matter content. This method does not apply to the determination of the
dry matter content of slush pulp nor to the determination of the saleable mass of lots of pulp.
3. DEFINITION
The dry matter content of a pulp sample is the mass of a test piece when dried to constant mass at
a temperature of 103 =t 2 "C under specified conditions, expressed as a percentage of the m
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