Testing item

Testing standard

Specification

USP35-NF30

BP2013

appearance

white or almost white fine powder; insoluble in water and ethyl alcohol

white or almost white fine powder; insoluble in water and ethyl alcohol

identification

meet the specification

meet the specification

alkali and alkali metal salt

/

meet the specification

content(in calcium oxide), %

9.0-10.5

 /

content(in calcium), %

 /

6.4-7.4

chloride, %

 /

≤0.1

sulfate, %

 /

≤0.3

loss on drying, %

≤4.0

≤6.0

heavy metal, ppm

≤10

 /

nickel, ppm

 /

≤5

lead, ppm

 /

≤10

cadmium, ppm

 /

≤3

freezing point,  ℃

≥54

≥53

acid value

/

195-210

stearic acid content, %

/

≥40

stearic acid&palmitic acid content, %

/

≥90