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IS0
INTERNATIONAL ORGAN lZATl ON FOR STAN DARDlZATlON
IS0 RECOMMEN DATION
R 806
ALUMINIUM OXIDE PRIMARILY USED
FOR THE PRODUCTION OF ALUMINIUM
DETERMINATION OF LOSS OF MASS AT 1000 "C AND 1200 "C
1 st EDIT I ON
A u g u st 1 968
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BRIEF HISTORY
The IS0 Recommendation R 806, Aluminium oxide primarily used for the production of
aluminium - Determination of loss of mass at IO00 "Cand 1200 OC, was drawn up by Technical
Committee ISO/TC 47, Chemistry, the Secretariat of which is held by the Ente Nazionale Italian0 di
Unificazione (UNI).
Work on this question by the Technical Committee began in 1961 and led, in 1964, to the
adoption of a Draft IS0 Recommendation.
In July 1966, this Draft IS0 Recommendation (No. 1028) 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 :
Ireland Sweden
Austria
Italy Switzerland
Belgium
Japan Turkey
Brazil
U.A.R.
Bulgaria Korea, Rep. of
United Kingdom
Canada Netherlands
U.S.A.
Chili Norway
Poland U.S.S.R.
Czechoslovakia
Yugoslavia
Romania
France
Germany South Africa,
Hungary Rep. of
India Spain
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 August 1968, to accept it as an IS0 RECOMMENDATION.
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ISO/R 806-1968 (E)
IS0 Recommendation R 806 August 1968
ALUMINIUM OXIDE PRIMARILY USED
FOR THE PRODUCTION OF ALUMINIUM
DETERMINATION OF LOSS OF MASS AT 1000 "C AND 1200 "C
INTRODUCTION
Aluminium oxide for industrial use undergoes a loss of mass when it is heated. Up to 300 "C this loss
of mass is due solely to the loss of moisture absorbed by the alumina due to its porosity. At high
temperatures the loss of mass observed is due in part to the residual water of constitution significantly
increased by the loss by dissociation of certain impurities (carbonates, sulphates, etc.). The total loss
of mass depends on the length of time the material is kept at these temperatures, on the content of
water and impurities, and on the nature of the impurities.
As there is no specific temgerature at which loss of water can be obtained exclusively and quantita-
tively, 1000 "C and 1200 C have been chosen arbitrarily as ignition temperatures for the determi-
nation of loss of mass on heating.
Neither of these two determinations can be considered as a criterion of the state of calcination of
aluminium oxide for industrial use. They can be carried out either separately or simultaneously.
1. SCOPE
This IS0 Recommendation describes the methods for the determination of loss of mass by ignition at
1000 "C and 1200 OC.
2. PMNCIPLE
Ignition of two test portions taken from the same aluminium oxide sample, previously dried at 300 OC,
and ignited, one at 1000 "C and the other at 1200 "C for 2 hours.
3. APPARATUS
Ordinary laboratory appar
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