ITEM

Industry grade

Food grade

Pharm. grade

Standard

Yotech Standard

USP-24

USP-27

Appearance

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 value20 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 mechanics

Industry grade sodium hydroxide compound

Food grade sodium carbonate compound

Pharm. grade glycine compound

Packing

25kg three-story plastic bag

25kg five-story plastic bag

25kg five-story plastic bag