Chemical Composition

Grade ST-0 ST-1
Se, min (%) 99.8 99.5
Fe max 0.005 0.01
Cu max 0.002 0.005
Pb max 0.002 0.005
Hg max 0.001 0.005
Te max 0.05 0.1
As max 0.003 0.005
S max 0.005 0.02
Al max 0.005 0.005