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UDC 678.41618.7 : 620.1
IS0
I N T ER N AT I O N A L ORGAN I Z AT I ON
FOR S TA N DA RD IZATl O N ’i
IS0 RECOMMENDATION
R 813
PREPARATION OF TEST PIECE AND METHOD OF TEST
OF THE ADHESION OF VULCANIZED RUBBER TO METAL
WHERE THE RUBBER IS ASSEMBLED TO ONE METAL PLATE
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 oniy
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 813, Preparation of test piece and method of test of the
adhesion of vulcanized rubber to metal where the rubber is assembled to one metal plate, 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
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Draft IS0 Recommendation.
In November 1963, this Draft IS0 Recommendation (No. 614) 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 813-1968 (E)
IS0 Recommendation R 813 'September 1968
PREPARATION OF TEST PIECE AND METHOD OF TEST
OF THE ADHESION OF VULCANIZED RUBBER TO METAL
WHERE THE RUBBER IS ASSEMBLED TO ONE METAL PLATE
1. SCOPE
This IS0 Recommendation describes a method for testing the adhesion strength of rubber-to-metal
bonds where the rubber part is assembled to one metal plate.
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 separation of a rubber part adhering to a
metal surface, the angle of separation and the width and thickness of the rubber being futed within
agreed limits. The angie of separation is 90".
3. APPARATUS
Testing machine. A tensile testing machine conforming to the requirements of national
3.1
standards for verification of testing machines should be used. It should be capable of accura-
tely registering the maximum force in newtons obtained during the test, and of maintaining
the specified constant rate of separation of the jaws of 50 f 5 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.
Dimensions in millimetres
II I 1.8
Attochment to upper
head of testing mochine
Grip ottaehed
here
/ 4P-
I
150 to I55
Test piece rubber/
FIG. 1-Test fiture fp the adhesion teat.
The tensile force is applied at an angle of 90 to the phe of the rubber-to-metai bond.
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ISO/R 813-1968 (E)
3.2 Fixture. Any suitable fixture for holding the test piece to the upper head of the machine may
be used, provided that the direction of pull to cause separation is at all times during the test as
nearly perpendicular as possible to the plane of the rubber-to-metal bond, that is, making an
angle of 90" with the face of the top holding fixture. The fixture shown in Figure 1, page 5,
complies with this requirement.
3.3 Grip. Any suitable grip may be used provided that it does not allow the rubber to slip or
cause it to rupture.
4. STANDARD TEST PIECE
4.1 Dimensions of standard test piece
The standard test piece should consist of a strip of rubber 6.0 f 0.1 mm thick in the test
area, 25.0 I 0.1 mm wide and 125 inm long, adhering to a 25 mm square area of the face
of a metal strip.
The dimensions of the metal strip should be 1.5 t 0.1 mm thick. 25.0 f 0.1 mm wide and
60 * 1 mm long.
The test piece should bc so prepared that the bonded area of 25 mm length and 25.0 f O. 1 mm
width is approximately in the middle of the metal strip as shown in Figure 2.
Dimensions in millimetres
I 125 -A
r
5
+I
'Pi
-4
Rirhher
FIG. 2-Example of standard test piece
Preparation of standard test piece
4.2
4.2.1 Two types of moulds may be used for vulcanization : moulds for several test pieces. or
moulds for single test pieces.
When the test pieces are to be made using one mix and one type of adhesive system,
4.2
...