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UDC 661.862.2:620.1
IS0
IN TERN AT1 ON AL O R G A N IZ AT1 O N FOR STANDARD IZATl ON
IS0 RECOMMEN
DATION
R 903
.
ALUMINIUM OXIDE PRIMARILY USED
FOR THE PRODUCTION OF ALUMINIUM
MEASUREMENT OF UNTAMPED DENSITY
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 903, Aluminium oxide primarily used for the production of
aluminium - Measurement of untamped density, 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 1962 and led, in 1966, to the
adoption of a Draft IS0 Recommendation.
1967, this Draft IS0 Recommendation (No. 1173) was circulated to all the IS0
In May
Member Bodies for enquiry. It was approved, subject to a few modifications of an editorial nature, by
the following Member Bodies :
Austria Israel South Africa, Rep. of
Belgium Italy Sweden
Switzerland
Bulgaria Japan
Canada Korea, Rep. of Thailand
Czechoslovakia Netherlands Turkey
France New Zealand U.A.R.
Germany Norway United Kingdom
Hungary Poland U.S.A.
India Portugal U.S.S.R.
Iran Romania Yugoslavia
Ireland 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 December 1968, to accept it as an IS0 RECOMMENDATION.
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ISO/R 903-1968 (
IS0 Recommendation R 903 Decem ber 1968
ALUMINIUM OXIDE PRIMARILY USED
FOR THE PRODUCTION OF ALUMINIUM
MEASUREMENT OF UNTAMPED DENSITY
1. SCOPE
This IS0 Recommendation describes a method for determination of the untamped density of alu-
minium oxide primarily used for the production of aluminium.
2. PRINCIPLE
Determination of the mass of a known volume of aluminium oxide collected after allowing it to fall
freely into a stationary container, avoiding vibration.
3. APPARATUS
3.1 Funnel, of 10 cm diameter and 60' an
...