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Ref. No. : ISO/R 872-1968 (E)
IS0
I NT ERN AT I ON A L ORGAN IZATl O N FOR STANDARDIZATION
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I s O R c O M M B~I D ATI O N/ ,Lf
DETERMINATION OF ASH
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OF UNPLASTICIZED CELLULOSE ACETAW
' 1st EDITION
I
I November 1968
of these
a member of ISO.
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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 872, Plastics - Determination of ash of unplasticized cellulose
acetate, was drawn up by Technical Committee ISO/TC 61, Plastics, the Secretariat of which is held
by the United States of America Standards Institute (USASI).
Work on this question by the Technical Committee began in 1964 and led, in 1965, to the
adoption of a Draft IS0 Recommendation.
In March 1967, this Draft IS0 Recommendation (No. 1003) 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 :
Australia Hungary Romania
Austria India South Africa, Rep. of
Belgium Iran Spain
Brazil Ireland Sweden
Bulgaria Israel Turkey
Canada Italy U.A.R.
Czechoslovakia Japan United Kingdom
Finland Korea, Rep. of U.S.A.
France Netherlands U.S.S.R.
Yugoslavia
Germany New Zealand
Greece
Poland
One Member Body opposed the approval of the Draft
Switzerland
The Draft IS0 Recommendation was then submitted by correspondence to the IS0 Council,
which decided, in November 1968, to accept it as an IS0 RECOMMENDATION.
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ISO/R 872-1968 (E)
IS0 Recommendation R 872 November 1968
PLASTICS
DETERMINATION OF ASH
OF UNPLASTICIZED CELLULOSE ACETATE
1. SCOPE
1.1 This IS0 Recommendation describes a method for determining the ash of unplasticized cellulose
acetate. The ash is formed from the inorganic matter which is present in the product.
The method is intended for cellulose acetate without plasticizers and free of additives, fillers,
1.2
dyes or other materials which may affect the test.
When plasticizers, additives, fillers or dyes which may affect the test are present, they should
1.3
be separated by a method agreed between the contracting parties.
2. PRINCIPLE OF THE METHOD
A suitable quantity of cellulose acetate is ignited and then ashed in a muffle furnace at 600 OC. The
residue obtained is weighed.
3. APPARATUS
The apparatus consists of the following :
3.1 Crucibl
...