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IS0
I N T E R N AT I O NA L ORGAN IZ AT1 O N FOR STAN DARD IZATl O N
IS0 RECOMMENDATION
R 249
DETERMINATION OF DIRT
IN RAW NATURAL RUBBER
1st E D IT I O N
March 1962
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 1 SO Recomn-ieridatiori II 249. D~~tcrmi~arim of' Dirt in Raiil Natura! Rithho., was
drawn up by Technical Conimittec iSQ,TC 45, Rirhher, the Secretariat of which is held
by the British Standards Institution (B.S.I.).
Work on thiç question by the Technical Coniniittee began in 1948 and Id. in 1958, to
the adoption of a Draft IS0 Rcconimend:ition.
Iii Deceiriher 1959, th;\ Draft IS0 Recoiriinendation (No. 342) was circulatcci to all
the IS0 Member Hodie. for enquiry. it ',+a$ approved. subject to a fcm inodifications of
an editorial nature, bl the following Member Bodies:
Australia Hungary Sweden
Austria India S wi t ze ria iid
Biirma Israel United Kingdom
Chile Japan U.S.A.
Coi o ni bi n Mexico [J.S.S.R.
Czechoslovakia Netherlands Yugoslavia
France Portugal
Germany Spain
One Member Body opposed the approkat of the Draft: Italy.
The Draft IS0 Reconiniendatioii M a5 then submitted hy correspondence to the IS0
Couricil, which decided, in March 1962, to accrpt it ac an IS8 RECOiMIblENDATION.
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iSO/ R 249-1962 (E)
I SO Reco m mend at i o n R 249 March 1962
DETERMINATION OF DIRT
IN RAW NATIJWAL RUBBER
1. SCOPE
This method is intended for the determination of dirt contained in raw natural rubber, and not
dirt present as surface contamination. in order that the method will giv
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