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IS0
I NTER N AT I O N A L ORGAN I Z AT I O N FOR STANDARD I ZATl O N
IS0 R EC O M M EN DATI O N
R 505
TEAR PROPAGATION RESISTANCE OF THE CARCASS
OF CONVEYOR BELTS
(METHOD OF TEST)
1st EDITION
October 1966
COPYRlGHT 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 505, Tear Propagation Resistance of the Carcass of Conveyor
Belts (Method of Test), was drawn up by Technical Committee ISO/TC 41, Pulleys and Belts
(including Vee-belts), the Secretariat of which is held by the Association Française de Normalisa-
tion (AFNOR).
Work on this question by the Technical Committee began in 1960 and led, in 1963, to the
adoption of a Draft IS0 Recommendation.
In December 1964, this Draft IS0 Recommendation (No. 768) was circulated to all the
IS0 Member Bodies for enquiry. It was approved by the following Member Bodies:
Argentina Greece Republic of South Africa
Australia India Spain
Austria Israel Sweden
Belgium Italy Switzerland
Chile Japan Turkey
Czechoslovakia Korea, Rep. of U.A.R.
Denmark Netherlands United Kingdom
Fin 1 and New Zealand U.S.A.
Pakistan U.S.S.R.
France
Germany Portugal Yugoslavia
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 October 1966, to accept it as an IS0 RECOMMENDATION.
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ISOlR 505 - 1966 (E)
IS0 Recommendation R 505 October 1966
TEAR PROPAGATION RESISTANCE OF THE CARCASS
OF CONVEYOR BELTS
(METHOD OF TEST)
1. SCOPE
The object of this IS0 Recommendation is to describe a method of test for the measurement of
the propagation resistance of an initial tear in the carcass of conveyor belts.
This test is intended for application to belts used in mines and in installatioris where there is a risk
of longitudinal tearing.
2. PRINCIPLE OF METHOD
The test consists in measuring, by means of tensile testing at a given speed, the force necessary to
propagate an initial tear made in a test piece from which the covers have been removed.
3. APPARATUS
The apparatus consists of a dynamometric tensile testing machine with the following essential
characteristics :
(a) themachine should be chosen so that the forces to be measured come within the upper
90 per cent range of its full rated capacity;
(b) the speed of separation of the jaws should be capable of being adjusted to 100 f 10 mm
(4 f 0.4 in) per minute;
(c) the free distance between the jaws should be capable of being adjusted to at least 300 mm
(12 in).
The machine should be provided with a device for the graphical recording of the force necessary
to continue tearing the test piece.
4. TEST PIECES
4.1 Shape and dimensions
Shape : rectangular.
Length : 300 mm (12 in).
Width : 100 f 1 mm (4 f 0.04 in).
...