Sealant foam

Sealant foam, or self-sealing foam, is a reactive material designed by humans to instantly seal breaches between a pressurized space and a vacuum.

Usage
It is used between the double hulls of space stations such as Tiara to fill small hull breaches made by micrometeorites or other space-borne debris.Halo: Contact Harvest, Chapter 18, page 303 The foam is also used in compartmentalized vacuum suits to protect the wearer from breaches. Thruster pack fuel lines are also equipped with sealant foam to prevent decompressions. The foam is yellow in color, and often stored in barrels.

List of appearances

 * Halo: Ghosts of Onyx
 * Halo: Contact Harvest