HARTMANN HYDROFILM TRANSPARENT FILM DRESSING. HYDROFILM transparent dressing in the 10 cm x 12.5 cm size is. 1 BOX OF 10 DRESSINGS. Indications: It is used as a primary dressing for dry or only slightly exuding, primary healing wounds, or as a secondary dressing for securing catheters, cannulae, or other primary dressings like calcium alginates.