ITEM

Idustry grade

Food grade

Chemical grade

SPEC

Yotech Standard

USP-24

USP-24

Apparence

white or slight yellow crystalline powder

white or slight yellow crystalline powder

white or slight yellow crystalline powder

Assay                ％

≥97.5％

≥98.5％

≥99％

Chloride               ％

≤0.7％

≤0.01％

≤0.01％

Fe                   ％

≤0.005％

≤0.002％

≤0.002％

Heavy mental              ％

≤0.002％

≤0.001％

≤0.001％

Arsenic                  ％

≤0.0002％

≤0.0001％

≤0.0001％

Residue on ignition            ％

≤0.15％

≤0.05％

≤0.05％

Loss on drying            ％

≤0.5％

≤0.2％

≤0.2％

PH value（20％ water）

10.5-11.0

8-10.5

10.5-11.0

Middle control item

White degree               ％

75-85％

≥85％

≥85％

Permeation rate            15％

≥90％

≥90％

≥95％

Particle size

(micron)             um,％

25-40um 90％

25-40um 90％

25-40um 95％

Store period             year

Two year

Two year

Three year

Provide reference

Produce technics

Industry grade sodium hydroxide compound

Food grade sodium carbonate compound

Chemical grade glycine compound

Packing

25kg three-story plastic bag

25kg five-story plastic bag

25kg five-story plastic bag