Polyvinylpyrrolidone

Item

Specification(USP26)

Result

Appearance

White or off-white powder

Conforms

K-value

81.0-98.3

94.9

Water, %

≤5.0

2.26

Nitrogen content, %

11.5-12.8

11.93

Heavy metal (as Pb), ppm

<10

Conforms

Ignition residue, %

<0.1

0.03

N-Vinylpyrrolidone (Impurity A), %

<0.2

0.02

Hydrazine, ppm

<1

<1

Aldehyde, ppm

<500

Conforms

(5% aq)

4.0-9.0

6.77

Conclusion

Qualified