Division 3.3.6

The impactor with the front member vertical shall be propelled horizontally at a velocity of 7,1 ± 0,1 m/s into the stationary pendulum as shown in Figure 6.

The pendulum tube shall have a mass of 3 ± 0,03 kg, an outside diameter of 150 mm ^{+ 1 mm}/- _{4 mm} and a wall thickness of 3 ± 0,15 mm. Total pendulum tube length shall be 275 ± 25 mm. The pendulum tube shall be made from cold finished seamless steel (metal surface plating is permissible for protection from corrosion), with an outer surface finish of better than 2,0 micrometers. It shall be suspended on two wire ropes of 1,5 ± 0,2 mm diameter and of 2,0 m minimum length. The surface of the pendulum shall be clean and dry. The pendulum tube shall be positioned so that the longitudinal axis of the cylinder is perpendicular to the front member (i.e. level), with a tolerance of ±2°, and to the direction of impactor motion, with a tolerance of ±2°, and with the centre of the pendulum tube aligned with the centre of the impactor front member, with tolerances of ±5 mm laterally and ±5 mm vertically.