I received the following information from Dr. Yoshihiro Watanabe of Toyo Seiko in Japan:

S80 Cast Steel Shot (JIS G 5903)
over 1.18mm : 0%
over 1.00mm : max 5%
over 0.71mm : min 85%
over 0.60mm : min 96%

Jack Champaigne (Dr. Peener)
Editor The Shot Peener