Purity, (Na) % 2.8-4.2
PH 5.5-7.5
NaCl, % ≤7.0
Drying loss, %≤10.0
Fe, %≤0.002
Heavy metal, %≤0.002
Appearance: White or offwhite powder. Hygroscopic.
Particle size: 100.0 % through 120 mesh sieve.
Solubility: Insoluble in methanol, ethanol and other organic solvents. Swells in water to form clear colloidal solution under room temperature.