White Petrolatum
» White Petrolatum is a purified mixture of semisolid hydrocarbons obtained from petroleum, and wholly or nearly decolorized. It may contain a suitable stabilizer.
Color— Melt about 10 g on a steam bath, and pour 5 mL of the liquid into a clear-glass, 16- × 150-mm bacteriological test tube: the warm, melted liquid is not darker than a solution made by mixing 1.6 mL of ferric chloride CS and 3.4 mL of water in a similar tube, the comparison of the two being made in reflected light against a white background, the tubes being held directly against the background at such an angle that there is no fluorescence.
Residue on ignition 281 Heat 2 g in an open porcelain or platinum dish over a flame: it volatilizes without emitting an acrid odor and on ignition yields not more than 0.05% of residue.
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Topic/Question Contact Expert Committee
Monograph Kevin T. Moore, Ph.D.
(EM205) Excipient Monographs 2
USP32–NF27 Page 3264
Pharmacopeial Forum: Volume No. 28(2) Page 570