Hangzhou Alum Classic Formulas … Natural Herb Library

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Dries dampness and stops discharge - Hang Fan follows the broader alum tradition in treating diarrhea, dysentery, leucorrhea, and overly weeping damp lesions.
Resolves toxicity and kills parasites - topical use extends to tinea, scabies, damp erosions, and infected or itching lesions that need a strongly drying mineral.
Shrinks tissue and stops bleeding - like other alum forms, it is used for oozing sores, bleeding hemorrhoids, and minor mucosal or tissue bleeding where astringency is desired.
Transforms phlegm and opens the orifices in older formula tradition - the same historical logic seen with Bai Fan applies here, although modern practice is much more cautious with internal use.

Bai Fan San logic - the alum-and-pig-bile pairing for phlegm-type epilepsy and old orifice-opening use.
Topical alum washes and powders - traditional strategy for damp skin disease, weeping lesions, and itching.
Hemorrhoid and prolapse applications with astringent wound powders - local-use formulas where alum's protein-precipitating action is the point.

Modern Chinese reference material on Ming Fan and the older Bai Fan tradition describes alum as sour, astringent, and cold, used to dry dampness, stop discharge, kill parasites, and arrest bleeding.
Hang Fan is best understood as a refined Hangzhou-associated alum designation carried in the import, not as a wholly separate mineral drug.