Document ID: chunk:federal_register_of_legislation:F2021C00470:body:0:p6
Version: federal_register_of_legislation:F2021C00470
Segment Type: other
Provision Reference: 
Character Range: 17073–20173

'Approved' test procedure.
23.3.2.2.                    Test procedure
23.3.2.2.1.              Apply a load through the block to the tyre's outer 'Sidewall' at a distance no less than that specified in Figure 1 for the applicable 'Rim' at a rate of 50  10 mm per minute, with the load arm substantially parallel to the tyre and 'Rim' assembly at time of engagement
23.3.2.2.2.              Increase the load until the 'Bead' unseats or the applicable value specified in Clause 23.2.2.2.4 is reached
23.3.2.2.3.              This test shall be repeated at least 4 times at locations approximately equally spaced around the tyre circumference.
23.3.3.                          Tyre Strength (Breaking Energy) Test
23.3.3.1.                    Preparation of tyre
23.3.3.1.1.              Mount the tyre on a 'Test Rim' and inflate it to the applicable pressure specified in Clause 23.3.1.1.2
23.3.3.1.2.              Condition it at test room temperance for at least 3 hours.
23.3.3.1.3.              Readjust its pressure to that specified Clause 23.3.1.1.2
23.3.3.2.                    Test procedure
23.3.3.2.1.              Force a cylindrical steel plunger with a hemispherical end and a diameter of 19  1.6 mm perpendicularly into the 'Tread' as near to the centreline as possible, avoiding penetration into my 'Tread' 'Groove', at the rate of 50  10 mm per minute.
23.3.3.2.2.              Record the force and penetration at the moment of breaking at each of 5 test points approximately equally spaced around the circumference of the tyre. If the tyre fails to break before the plunger is stopped on reaching the 'Rim', and the required minimum breaking energy is not achieved, then the required minimum breaking energy is deemed to have been achieved at that point
23.3.3.2.3.              Compute the breaking energy for each test point by means of the following formula:

         Where W = Energy, Joules

         F = Force, Newtons

         P = Penetration, mm

23.3.3.2.4.              Determine the breaking energy value for the tyre by computing the average of the 5 values obtained in accordance with Clause 23.3.3.2.3.

23.3.4.                          Tyre Endurance Test
23.3.4.1.                    Preparation of tyre
23.3.4.1.1.              Mount a new tyre on a 'Test Rim' and inflate it to the applicable pressure specified in Clause 23.3.1.1.2
23.3.4.1.2.              Condition the tyre assembly at a temperature not less than 35 degrees Celsius for at leas 3 hours.
23.3.4.1.3.              Readjust tyre pressure to that specified in Clause 23.3.1.1.2 immediately before testing.
23.3.4.2.                    Test procedure
23.3.4.2.1.              Mount the tyre and `Test Rim' assembly on a test axle and press it against a flat-faced steel test wheel of an outside diameter not greater than 1.71 metres and at least as wide as the `Section Width' of the tyre to be tested, or an `Approved' equivalent test wheel.
23.3.4.2.2.              During the test the ambient temperature at a distance of not less than 150 mm and not more than one metre from the tyre shall