It is usually waterproof and breathable, allowing the site to be seen without removing the dressing. Tegaderm is one example of a semipermeable film dressing. Pfenninger and Fowler's Procedures for Primary Care, Third lists Tegaderm among such dressings.
Do not use it to replace sutures or to close a deep/gaping wound. For an IV or catheter site, follow the product instructions and local infection-control protocol. The
manufacturer's indications include catheter sites, minor wounds, device securement, and secondary wound coverage.