Ball falling distance: 460±0.5%mm (China standard)
500±0.5%mm (American standard)
Ball diameter: Φ16±0.05mm
Falling ball rebound rate accuracy: 1.5
The tested sample size (LxWxH): 100x100x50mm
Standards: GB/T6670-97, ASTM (American standard) D3574 and ISO8307
