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U DC 621 .E52
IS0
I N TER NAT1 O N AL O R GAN 1 Z AT1 O N F O R STAN DAR D I Z AT1 O N
IS0 RECOMMENDATION
R 283
FULL THICKNESS TENSILE STRENGTH AND ELONGATION
OF CONVEYOR BELTS
SPECIFICATIONS AND METHOD OF TEST
1st EDITION
November 1962
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 283, Full Thickness Tensile Strength and Elongation of
Conveyor Belts - SpeciJcations and 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 Associa-
tion Française de Normalisation (AFNOR).
Work on this question by the Technical Committee began in 1956 and led, in 1959, to the
adoption of a Draft IS0 Recommendation.
In March 1961, this Draft IS0 Recommendation (NO 442) was circulated to all the IS0
Member Bodies for enquiry. It was approved by the following Member Bodies:
Australia France Spain
Austria Germany Sweden
Belgium Greece Turkey
Brazil Iran United Kingdom
Chile Israel U.S.A.
Colombia Mexico U.S.S.R.
Czechoslovakia New Zealand Yugoslavia
Denmark Portugal
One Member Body opposed the approval of the Draft: Italy
The Draft IS0 Recommendation was then submitted by correspondence to the IS0
Council, which decided, in November 1962, to accept it as an IS0 RECOMMENDATION.
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e
ISOIR 283 - 1962 (E)
IS0 Recommendation R 283 November 1962
FULL THICKNESS TENSILE STRENGTH AND ELONGATION
OF CONVEYOR BELTS
SPECIFICATIONS AND METHOD OF TEST
1. SCOPE
The purpose of this IS0 Recommendation is to lay down the conditions for full thickness tensile
strength testing of conveyor belts, and also the corresponding specifications (breaking strength
and elongation, elongation under reference load).
It applies to both “surface” and “underground” belts.
2. SPECIFICATIONS
2.1 Breaking strength
The minimum values of full width breaking strength in the longitudinal (warp) and the
transverse (weft) directions are given in the table below in force units and referred to the
unit of the width of the test piece.
Longitudinal direction * Transverse direction
~___~
Minimum values
Minimum values
kgf/cm lbfiin kgf/cm ~ lbf/in
I
160 895 63 3 50
200 1120 80 450
250 1400
315 1760
400 2240
500 2800 free
630 3525
>,
800 4480
>>
* The value of the breaking strength of a belt in the longitudinal direction is included in the standard designation for that
belt.
NOTES
1. The metric values shown in the table above belong to the R 10 series of preferred numbers, in accordance with
IS0 Recommendation R 3, Preferred Numbers - Series of Preferred Numbers.
2. The table of metric values for strength in the longitudinal direction may be extended in both directions by using
preferred numbers from the R 10 series downward or upward:
125, 100 etc.
1 OOO, 1 250 etc.
3. The table of metric values for strength in the transverse direction may be extended downward by using preferred
numbers of the R 10 series in that direction:
50, 40 etc.
(4480 lbf/in) and over (in the
On the other hand, transverse strength remains open for belting of 800 kgf/cm
longitudinal direction).
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ISOlR 283 - 1962 (E)
2.2 Elongations in the longitudinal direction*
The values shown below are given unless otherwise specified (this may occur in particular for
single ply belts, metal belts and certain belts of very great length):
4 per cent maximum
Elongation under reference load* *
(The tensile stress = 10 per cent of of the minimum specified
strength and called “reference load”).
10 per cent minimum
Breaking elongation
3. METHOD OF TEST
3.1 Principle
A test piece cut from the full width of the belt is tensile tested until it breaks.
3.2 Apparatus
The apparatus consists of the following:
3.2.1 Dynamometer. The dynamometer load should be suitable for the strength of the test piece.
3.2.2 Grips. The form of the grips should ensure perfect fixing of
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