From Halopedia, the Halo wiki
Sealant mesh is a Covenant medical technology. It is as a thin sheet of bronze-colored material that, when properly affixed, will form a partial seal over wounds (allowing air to escape as the wounded person exhales but keeping it in when the person inhales). The mesh also contains a coagulant that helps keep the wounded person's blood inside their body.
List of appearances
- Halo: Contact Harvest (First appearance)
- Halo: Contact Harvest, page 258
- Halo: Contact Harvest, page 259