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IS0
I N T ER N AT1 O N A L O R G A N IZ AT I O N FOR
STAN DARD I Z AT I ON
IS0 RECOMMENDATION
R 340
FLAME RESISTANCE OF CONVEYOR BELTS
SPECIFICATIONS AND METHOD OF TEST
1st EDITION
September 1963
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 340, Flame Resistance of Conveyor Belts-Speczjïcations
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 Association Française de
Normalisation (AFNOR).
Work on this question by the Technical Committee began in 1958 and led, in 1961, to
the adoption of a Draft IS0 Recommendation.
In December 1961, this Draft IS0 Recommendation (No. 494) was circulated to all
the IS0 Member Bodies for enquiry. It was approved by the following Member Bodies:
Argentina France New Zealand
Austria Germany Portugal
Be 1 g i u m Greece Spain
Sweden
Brazil India
Bulgaria Ireland Switzerland
Czechoslovakia Israel United Kingdom
Denmark Italy U.S.A.
Finland Netherlands U.S.S.R.
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 September 1963, to accept it as an IS0 RECOMMENDATION.
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IS0 / R 340 - I963 (E)
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IS0 Recommendation R 340 September 1963
FLAME RESISTANCE OF CONVEYOR BELTS
SPECIFICATIONS AND METHOD OF TEST
1. SCOPE
The purpose of this IS0 Recommendation is to specify conditions for a flame resistance test for
conveyor belts, and the corresponding specifications.
NOTE. - To increase safety, it is important for tests to take account, to the greatest possible
extent, of the circumstances which may create hazards. It is for this reason that, in the present
IS0 Recommendation, provision is made for performing the test on test pieces without covers,
as covers of belts may be ripped off accidentally in service.
2. SPECIFICATIONS
2.1 Duration of flame (after removal of the burner)
Less than 45 seconds for each group of six tests, and no single value should be greater than
15 seconds.
(See clause 3.4 " Procedure ").
2.2 Non-reappearance of flame* (after applying a current of air)
(See clause 3.4 " Procedure ").
3. METHOD OF TEST
3.1 Principle
A test piece is placed in the flame of a burner, then the burner is removed and the combustion
time of the test piece is noted (duration of flame). A current of air is applied to the test piece
a certain time after the extinction of the flame.
3.2 Test pieces
3.2.1 Shape and dimensions
Rectangular test piece (cut out from the conveyor belt) :
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