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UDC 678.031 : 620.1
Ref. No. : ISO/R 123-1968 (E)
IS0
I N T ERN AT1 O N A L ORGANIZATION FOR STANDARD I ZATl O N
IS0 RECOMMENDATION
R 123
SAMPLING OF LATEX
2nd EDITION
April 1968
This second edition supersedes the first edition
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
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 123, SumpZing of Latex, was drawn up bv Technical Committee ISO/TC 45,
Rubber, the Secretariat of which is held by the British Standards Institution (BSI).
Work on this question by the Technical Committee
began in 1948 and led, in 1955, to the adoption of a
Draft IS0 Recommendation.
In March 1957, this Draft IS0 Recommendation (No. 144) was circulated to all the IS0 Member Bodies for
enquiry. It was approved by 23 Member Bodies. 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 August 1959, to accept it as an IS0 RECOMMENDATION.
BRIEF HISTORY
RELATING TO THE 2nd EDITION
45, Rubber, drew up a draft proposal
In 1959, the Secretariat of Technical Committee ISO/TC
for the revision of IS0 Recommendation R 123-1959, Samplingoflatex, in order to accommodate in
this Recommendation methods for the sampling of synthetic latices. This draft proposal was adopted
by the Technical Committee as a Draft IS0 Recommendation.
In November 1963, this Draft revision (No. 622) 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 Germany Spain
Australia Hungary Sweden
Austria India Switzerland
Brazil Israel United Kingdom
Japan U.S.A.
Canada
Chile Korea, Rep. of U.S.S.R.
Colombia Netherlands Yugoslavia
Czechoslovakia New Zealand
Poland
France
No Member Body opposed the approval of the Draft.
The Draft revision was then submitted by correspondence to the IS0 Council which decided, in
April 1968, to accept it.
This edition (2nd edition) supersedes the first edition of IS0 Recommendation R 123 -1959.
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ISO/R 123-1968 (E)
IS0 Recommendation R 123
April 1968
SAMPLING OF LATEX
1. SCOPE
This IS0 Recommendation describes procedures for the sampling of natural rubber latex which
contains preservative agents and which may have been submitted to some type of concentration
process, and also for the sampling of synthetic rubber latices. These procedures are not necessarily
suitable for latices from natural sources other than Hevea brasdiensis or for compounded latex,
vulcanised latex or artificial dispersions of rubber.
2. GENERAL
Rubber latex may tend to cream on standing. If stratification has occurred, the latex should be
thoroughly agitated to obtain a homogeneous blend suitable for the withdrawal of a representative
sample. The procedure required differs with the type of container and facilities available.
In all cases where samples are drawn from several containers, e.g., 10 sampling of latex in drums, or
in the case of tanks or tank cars where extractions are made at various depths, such samples should be
bulked and stirred. The fmal average sample should then be bottled and sealed.
Synthetic rubber latices may form a skin when exposed to air. The sample should therefore be kept
in a closed container. Care should be taken, however, not to fill the container completely, so as to
allow for thermal expansion. Polyethylene or other container materials which may be attacked by
residual monomers present in synthetic latex should not be used.
During the handling and testing of the sample care should be taken not to generate foam or to
introduce air. Casca
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