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IS0
O RG A N IZATl ON STA N DA RDl ZATl ON
I N TERN AT1 ON A L FOR
IS0 RECOMMENDATION
R 776
PU LPS
DETERMINATION OF ACID INSOLUBLE ASH
1st EDITION
July 1968
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a member of ISO.
For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
to be obtained through the national standards organizations.
Also issued in French and Russian. Copies
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BRIEF HISTORY
The IS0 Recommendation R 776, Pulps - Determination of acid insoluble ash, was drawn up
by Technical Committee ISO/TC 6, Paper, board and pulps, the Secretariat of which is held by the
Association Française de Normalisation (AFNOR).
Work on this question by the Technical Committee began in 1965 and led, also in 1965, to the
adoption of a Draft 1SO Recommendation.
In November 1966, this Draft IS0 Recommendation (No. 1067) was circulated to all the 1SO
Member Bodies for enquiry. It was approved, subject to a few modifications of an editorial nature,
by the following Member Bodies :
Argentina India Portugal
Australia Iran Romania
Belgium Israel Spain
Brazil Italy Sweden
Bulgaria Japan Switzerland
Canada Korea, D.P.R. of Turkey
Czechoslovakia Korea, Rep. of U.A.R.
Denmark Mexico United Kingdom
Finland Netherlands U.S.A.
France New Zealand U.S.S.R.
Germany Norway Yugoslavia
One Member Body opposed the approval of the Draft
Cuba
The Draft IS0 Recommendation was then submitted by correspondence to the IS0 Council,
which decided, in July 1968, to accept it as an IS0 RECOMMENDATION.
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ISO/R 776-1968 (E
July 1968
IS0 Recommendation R 776
PU LPS
DETERMINATION OF ACID INSOLUBLE ASH
1. SCOPE
This IS0 Recommendation describes a method for the determination of the acid insoluble ash in
pulp, which is the insoluble residue obtained after reducing the pulp to ash and treating the ash with
hydrochloric acid.
2. FIELD OF APPLlCATION
The method applies to ail kinds of pulps.
3. PRlNCIPLE OF THE METHOD
The pulp is ashed and the ash is treated with hydrochloric acid. The insoluble residue is filtered,
washed, ignited and weighed.
4. REAGENT
4.1 Hydrochloric acid, about 6 M. Dilute 500 ml of hydrochloric acid (HCI) (d= 1.19) with 500 ml
of distilled water. The acid should be of analytical grade.
5. APPARATUS
5.1 Dishes, of platinum.
5.2 Balance, with an accu
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