|
Ref. No.: ISO/R 498 - 1966 (E)
IS0
INTERN AT1 ON AL O RG A N IZATl O N FOR STA N DA RD I ZATlO N
IS0 RECOMMENDATION
R 498
PREPARATION OF DRY FILMS
FROM CONCENTRATED NATURAL RUBBER LATEX
1st EDIT ION
September 1966
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.
---------------------- Page: 1 ----------------------
BRIEF HISTORY
The Draft IS0 Recommendation R 498, Preparation of Dry Films from Concentrated
Natural Rubber 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 1957 and led, in 1962, to
the adoption of a Draft IS0 Recommendation.
In November 1963, this Draft IS0 Recommendation (No. 628) was circulated to all the
IS0 Member Bodies for enquiry. It was approved, subject to a few modifications of an editorial
d
nature, by the following Member Bodies :
Argentina France New Zealand
Australia Germany Poland
Austria Hungary Spain
Brazil India Sweden
Bulgaria Israel Switzerland
Canada
Italy United Kingdom
Chile
Japan U.S.A.
Colombia Korea, Rep. of U.S.S.R.
Czechoslovakia Netherlands 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 September 1966, to accept it as an IS0 RECOMMENDATION.
-2-
---------------------- Page: 2 ----------------------
1
ISO/R 498 - 1966 (E)
IS0 Recommendation R 498 September 1966
PREPARATION OF DRY FILMS
FROM CONCENTRATED NATURAL RUBBER LATEX
1. SCOPE
This IS0 Recommendation describes a procedure for preparing dry films from natural rubber
latex which contains preservative agents and which has been submitted to some type of con-
centration process. The procedure 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 dispersions of rubber.
This IS0 Recommendation describes the preparation of dry homogeneous films which are sub-
stantially free of air bubbles.
2. APPARATUS
The apparatus consists of the following:
A suitable mould, in which the film can be cast and which should be prepared by cementing
2.1
strips of rigid plastics material 6 mm wide and 1.5 mm thick on a flat piece of glass plate.
The surface of the cavity so formed should be preferably from 125 to 150 mm square.
Adhesives suitable for affixing the plastics strips to the glass are epoxide resin adhesive,
and polyvinyl acetat
...