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UDC 678.031 : 620.1
Ref. No. : ISO/R 705-1968 (E)
IS0
I N TERN AT1 O N A L O RG A N IZATl O N FOR STAN DA RD IZATl ON
IS0 RECOMMENDATION
R 705
METHOD FOR THE DETERMINATION OF DENSITY OF LATEX
1st EDITION
April 1968
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 705, Method for the determination of density of latex, was
drawn up by 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 1962, to the
adoption of a Draft IS0 Recommendation.
In November 1963, this Draft IS0 Recommendation (No. 618) was circulated to ali the IS0
L
Member Bodies for enquiry. It was approved, subject to a few modifications of an editorial nature, by
the following Member Bodies :
Argentina Germany Poland
Australia Hungary Spain
India Sweden
Austria
Brazil Israel Switzerland
Canada Italy United Kingdom
U.S.A.
Chile Japan
Korea, Rep. of U.S.S.R.
Colombia
Czechoslovakia Netherlands Yugoslavia
France New Zealand
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 April 1968, to accept it as an IS0 RECOMMENDATION.
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ISO/R 705-1968 (E)
IS0 Recommendation R 705 April 1968
METHOD FOR THE DETERMINATION OF DENSITY OF LATEX
INTRODUCTION
Density determinations are used to calculate the weight of a measured volume of latex in locations
where it is not possible to weigh directly. For such purposes it is essential that the density be
determined on a latex sample containing the same amount of air as it contained when the volume was
measured. Before sampling, the latex is therefore allowed to stand for a minimum period of 24 hours
to ensure the removal of air bubbles. The density determination is made at the same temperature as
the volume measurement, otherwise a correction should be applied.
1. SCOPE
This IS0 Recommendation describes a method of test applicable to natural rubber latex which
contains preservative agents and has a total solid content up to 63 O/".
The method of test is not necessarily suitable for latices from natural sources other than Hevea
brasiliensis, or for latices of synthetic rubber, compounded latex, vulcanized latex or artificial
dispersion of rubber.
2. DEFINITION
Density is the mass divided by the volume at a stated temperature. The units should be stated.
3. APPARATUS
3.1 Density bottle, 50 ml capacity having a ground-glass stopper perforated by a capillary tube and
a ground-glass cap and, if desired, an evacuated jacket.
3.2 Constant temperature bath, accurate to within k 0.2 "C and adjustable to a temperature above
or below ambient temperature.
3.3 Balance, to weigh accurately to the nearest 0.001 g.
3.4 Two conical flasks, of at least 200 ml capacity, each fitted with a rubber stopper, a short glass
inlet tube with a rubber blowing ball at the external end and a glass outlet tube reaching
nearly to the bott
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