Item

  Flake

Excellent Grade

First-rate Grade

KOH

95.0

90.0

K2CO3

0.5

0.5

Chloride (Cl)

0.005

0.005

Fe

0.0005

0.0005

Sulfate (SO42-)

0.005

0.005

Nitrate&Nitrite (N)

0.0005

0.0005

Na

0.8

0.8

Phosphate (PO4)

0.005

0.005

Silica (SiO3)

0.01

0.01

Al

0.002

0.002

Ca

0.005

0.005

Ni

0.0005

0.0005

Heavy Metal (as Pb)

0.002

0.002