Items of test

Specification

Appearance

White or milky white powdery

Azelaic acid %

≥97.00

Acid value (mg KOH/g)

≥589

Transmittance(440nm/550nm),%

95/98

Single- acid (%)

≤0.10

Melting point ℃

103-109

Moisture %

≤0.5

Iron, ppm                                                                                                                                                                                                

≤1.00