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.