EUROLAB, with its state-of-the-art accredited laboratories and expert team, provides precise and fast testing services within the scope of BS 903-A3 testing. This part of BS 903 specifies three test methods for determining the tear strength of vulcanized rubber:
The tear strength value obtained depends on the shape of the test piece, the strain rate and the temperature of the test. It may also be sensitive to grain effects in vulcanized rubber.
Method A using the trousers test piece is preferred as it is not sensitive to the length of the cut, unlike the other two test pieces where the notch must be checked very closely. In addition, the results obtained are more easily related to the basic tear properties of the material and less susceptible to modulus effects (provided that leg extension is negligible), and the rate of tear propagation is directly related to the grip rate. For some rubbers, the propagation of the tear is not uniform (knotted tear) and the results can be difficult to analyze.
This test is a combination of rupture initiation and propagation. Tension builds up at the angle point until enough to initiate a tear, and then other stresses propagate the tear. However, it is only possible to measure the total force required to break the test piece, and therefore the force cannot be decomposed into the two components that produce initiation and propagation.
This test also measures the force required to spread a notch already produced in the test piece, and the spreading velocity is not related to the jaw velocity.
EUROLAB assists manufacturers with BS 903-A3 test compliance. Our test experts, with their professional working mission and principles, provide you, our manufacturers and suppliers, the best service and controlled testing process in our laboratories. Thanks to these services, businesses receive more effective, high-performance and quality testing services and provide safe, fast and uninterrupted service to their customers.
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