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Ref. No. : ISO/R 902-1968 (E)
IS0
I N TER N AT1 O N A L O RG A N IZATl ON
FOR S TA N DA RD IZATlO N
IS0 RECOMMENDATION
R 902
.
ALUMINIUM OXIDE PRIMARILY USED
FOR THE PRODUCTION OF ALUMINIUM
MEASUREMENT OF THE ANGLE OF REPOSE
1st EDITION
December 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 902, Aluminium oxide primarily used for the production of
aluminium - Measurement of the angle of repose, was drawn up by Technical Committee ISO/TC 47,
Chemisny, the Secretariat of which is held by the Ente Nazionale Italian0 di Unificazione (UNI).
Work on this question by the Technical Committee began in 1962 and led, in 1966, to the
adoption of a Draft IS0 Recommendation.
In May 1967, this Draft IS0 Recommendation (No. 1172) 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 :
Austria Israel Spain
Belgium Italy Sweden
Switzerland
Bulgaria Japan
Korea, Rep. of Thailand
Canada
Czechoslovakia Netherlands Turkey
U.A.R.
France New Zealand
United Kingdom
Germany Norway
Poland U.S.A.
Hungary
Portugal U.S.S.R.
India
Romania Yugoslavia
Iran
South Africa, Rep. of
Ireland
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 December 1968, to accept it as an IS0 RECOMMENDATION.
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ISO/R 902-1968 (E
IS0 Recommendation R 902 December 1968
ALUMINIUM OXIDE PRIMARILY USED
FOR THE PRODUCTION OF ALUMINIUM
MEASUREMENT OF THE ANGLE OF REPOSE
1. SCOPE
This IS0 Recommendation describes a conventional method for the measurement of the angle of re-
pose of aluminium oxide primarily used for the production of aluminium.
2. PRINCIPLE
Measurement of the angle at the base of the cone of aluminium oxide obtained by allowing a sample
to fall through a fwed distance from a defined funnel onto a horizontal base plate.
3. APPARATUS
Only the dimensions given in the text are mandatory.
The apparatus (see Figure) consists of the following items :
3.1 Funnel, of stainless steel, with an internal diameter of the nozzle of 6 mm, fitted with a sieve
of 1 mm aperture mesh held in position between two retaining plates. The funnel is screwed
into its support.
3.2 Buse plate, minimum size 270 mm long by 200 mm wide. It should be perfectly rigid and made
of marble, stainless steel or other corrosion resistant metal. On the
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