Item

Model specification

Top grade

First grade

Sodium hydroxide (calculated as NaOH)% ≥

32.0

Sodium carbonate ( calculated as Na 2 CO 3 )% ≤

0.04

0.06

Sodium chloride (as NaCl)% ≤

0.004

0.007

Iron trioxide ( calculated as Fe 2 O 3 )% ≤

0.0003

0.0005

Silica ( calculated as SiO 2 )% ≤

0.0015

0.003

Sodium chlorate ( calculated as NaClO 3 )% ≤

0.001

0.002

Sodium sulfate ( calculated as Na 2 SO 4 )% ≤

0.001

0.002

Aluminum oxide ( calculated as Al 2 O 3 )% ≤

0.0004

0.0005

Calcium oxide (calculated as CaO)% ≤

0.0001

0.0005