Particle size Microscopy More than 90% of particle sizes
are less than 10µm.
Maximum particle size does not
exceed 20µm
Average particle sizes are
in the range of 6.0~14.0µ
Color Reflection ratio comparison
between white board made from
barium sulfate and white board
made from SP-500/SP-10
80.0%min 70.0%min
Bulk JSQI(bulk measuring method) 3.5~6.0(cc/g)(target value) 2.0~4.0(cc/g)
Water-soluble substances JSQI(water-soluble test method) 0.5% max. 0.5% max.
Residue on ignition JSQI(test method of
residue on ignition)
0.5% max. 0.5% max.
pH(suspension in water) JSQI(pH measuring method) 6.0~8.0 6.0~8.0
Arsenic Content JSQI(arsenic test method) 1ppm max. 1ppm max.
Heavy Metal Content JSQI(heavy metal test method) 10ppm max. 10ppm max.

*JSQI : Japanese Standards of Quasi-Drug Ingredients