8. Test Parameters
8.1 Table 2 indicates the force applied against the test specimen and the number of wheel revolutions for test Proce- dures A through E.
8.2 Sand Flow The rate of sand flow shall be 300 to 400 g/min (0.66 to 0.88 lb/min).
8.3 Time The time of the test will be about 30 min for Procedures A and D, 10 min for Procedure B, 5 min for Procedure E, and 30 s for Procedure C, depending upon the actual wheel speed. In all cases the number of wheel revolu- tions and not the time shall be the controlling parameter.
8.4 Lineal Abrasion Table 2 shows the lineal distance of scratching abrasion developed using a 228.6-mm (9-in.) diam- eter wheel rotating for the specified number of revolutions. As the rubber wheel reduces in diameter the number of wheel revolutions shall be adjusted to equal the sliding distance of a new wheel (Table 2) or the reduced abrasion rate shall be taken into account by adjusting the volume loss produced by the worn wheel to the normalized volume loss of a new wheel. (See 10.2.)