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Ref. No. : ISO/R 814-1968 (E)
IS0
I NT ERN AT1 ON A L ORGAN IZATl O N FOR STANDARD IZATl O N
IS0 RECOMMENDATION
R 814
PREPARATION OF TEST PIECE AND METHOD OF TEST
OF THE ADHESION OF VULCANIZED RUBBER TO METAL
WHERE THE RUBBER IS ASSEMBLED TO TWO METAL PLATES
1st EDITION
September 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 814, Preparation of test piece and method of test of the adhesion
of vulcanized rubber to metal where the rubber is assembled to two metal plates, was drawn up by
Technical Committee ISO/TC 45, Rubber, the Secretariat of which is held by the British Standards
Institution (BSI).
Work on this question by the Technical Committee led, in 1962, to the adoption of a Draft
IS0 Recommendation.
In November 1963, this Draft IS0 Recommendation (No. 615) 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 :
Argentina Germany Poland
Australia Hungary Spain
Austria India Sweden
Brazil Israel Switzerland
Canada Italy United Kingdom
Chile Japan
U.S.A.
Colombia Korea, Rep. of U.S.S.R.
Czechoslovakia Netherlands Yugoslavia
France New Zealand
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 1968, to accept it as an IS0 RECOMMENDATION.
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ISO/R 814-1968 (E)
IS0 Recommendation R 814 September 1968
PREPARATION OF TEST PIECE AND METHOD OF TEST
OF THE ADHESION OF VULCANIZED RUBBER TO METAL
WHERE THE RUBBER IS ASSEMBLED TO TWO METAL PLATES
1. SCOPE
This IS0 Recommendation describes a method for testing the adhesion strength of rubber-to-metal
bonds where the rubber part is assembled between two parallel metal plates.
This IS0 Recommendation primarily applies to test pieces prepared in the laboratory under standard
conditions, such as may be used to provide data for the development and control of rubber com-
pounds and methods of manufacture.
2. PRINCIPLE OF TEST
The test consists of measuring the force required to cause the rupture of a unit of standard dimensions,
comprising rubber bonded to two parallel metal plates, the direction of the force being at 90' to the
bonding surface.
3. APPARATUS
3.1 Testing machine. A tensile testing machine conforming to the requirements of national stan-
dards for verification of testing machines should be used. It should be capable of accurately
registering the maximum force in newtons obtained during the test, and of maintaining the
specified constant rate of separation of the jaws of 25 25 mm per minute.
NOTE. - Inertia (pendulum) type dynamometers are apt to give results which differ because of frictional
and inertial effects. An inertia-less (for example, electronic or optical transducer) type dynamometer gives
results which are free from these effects and is therefore to be preferred.
Fixtures. The fixtures for holding the test pieces in the testing machine should permit accurate
3.2
centering of the applied load during the test.
A suitable type of fixture is shown in Figure 1.
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ISO/R 814-1968 (I
Dimensions in millimetres
@--
O--
Part A - Tail fillet to suit test
machine
@--
-0
ii
IW
Part B - Bridle fillet threaded
to take part C
GM50x3
+-
Assembly of parts
@ = metal part of test piece
0 = rubber
Part C - Split across centre to
accept test piece and
threaded to fit into part B.
FIG. 1 - Test fixtures for holding rubber-to-metal bond test pieces
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ISOlR 814-1968 (I
4. STANDARD TEST PIECE
4.1 Dimensions of standard tes
...