BS ISO 36-2020 Rubber, vulcanized or thermoplastic – Determination of adhesion to textile fabrics.
10 Conditioning of test pieces and temperature of test
Condition all test pieces in accordance with ISO 23529. If the preparation of test pieces involves buffing, the interval between buffing and testing shall be not less than 16 ii and not greater than 72 h.
For tests at a standard laboratory temperature (see ISO 23529). test pieces that do not require further preparation may be tested immediately, if cut from conditioned test samples. Where additional preparation is involved, a minimum conditioning period of 3 h at a standard laboratory temperature shall be allowed.
For tests at temperatures other than a standard laboratory temperature, condition the test pieces at the temperature at which the test is to be conducted for a period sufficient to enable the test pieces to attain substantial equilibrium in accordance with ISO 23529.
11 Procedure
Take the test piece as described in Zi or 72. For test pieces taken from a product, separate a ply of fabric or a rubber layer by hand for a distance of approximately 50 mm. The use of a scalpel or similar implement might be necessary to initiate the separation.
Fix the separated ends of the test piece in the grips of the test machine (&1) and adjust so that the tension is distributed uniformly and so that no twisting of the test piece will occur during the test. Place the body of the test piece in the non-driven grip and the ply to be separated in the power-driven grip so that the angle of separation Is approximately 1800. It is important to ensure that the strips of test piece held in the grips lie in the same plane.
Start the machine and continue the ply separation while recording on the chart recorder or in the memory of the computer (see &Z) the force values over a length separation of at least 100 mm. The rate of travel of the power-driven grip shall be 50 mm/mm ± 5 mm/mm.
Examine the separated pieces for separation or failure.
12 Expression of results
12.1 Calculate the adhesion strength of the test piece by dividing the separation force, determined in accordance with ISO 6133:2015 using method A, B, C, D or E, as appropriate to the trace, by the width of the test piece. Report the result as the median of the individual values obtained for the three test pieces, expressed in newtons per millimetre.
12.2 Describe the type of failure or separation using the following terminology:
R indicates that the failure is in the rubber layer;
RA indicates that the separation is between the rubber layer and the adhesive;
AT Indicates that the separation Is between the adhesive and the fabric;
RB indicates that the failure is in the rubber bond between two fabric plies;
RT indicates that the separation is between the rubber and the fabric when no adhesive is present.
13 Test report
The test report shall include the following information:
a) sample details:
1) a full description of the sample and its origin,
2) the method of preparation of the test pieces from the sample, for example moulded or cut,
3) whether the test pieces were cut with their length in a plane parallel or perpendicular to the warp direction;
b) a reference to the test method used, i.e. the number of this document (ISO 36:2020)
c) test details:
1) the standard laboratory temperature used,
2) the time and temperature of conditioning prior to the test,
3) the temperature of test, if other than a standard laboratory temperature, and the relative humidity, if necessary,
4) the number of test pieces tested (if not three).BS ISO 36 pdf download.