Firefighters training at a U.S. Air Force base in fire proximity suits
Detail of fire proximity suit
A fire proximity suit (also, silvers or silver bunker suit) is a suit designed to protect a firefighter from high temperatures, especially near fires of extreme temperature such as aircraft fires.
Fire proximity suits first appeared during the 1930s, and were originally made of asbestos fabric (hence also known as the asbestos suit). Today they are manufactured from vacuum-depositedaluminized materials that reflect the high radiant loads produced by the fire.
There are three basic types of these aluminized suits:
Approach suit—used for work in the general area of high temperatures such as steel mills and smelting facilities. (Ambient heat protection up to ~200 °F (93 °C).)
Proximity suit—used for aircraft rescue and fire fighting (AR-FF) and, in more heavily insulated versions, for kiln work requiring entry into the heated kiln. (Kiln suit ambient protection ~2,000 °F (1,093 °C) and proximity ambient protection~ 500 °F (260 °C))
Entry suit—used for entry into extreme heat and situations requiring protection from total flame engulfment. Most commonly made of Zetex or Vermiculite and not aluminized. (Entry suit ambient protection ~2,000 °F (1,093 °C)) for short duration and prolonged radiant heat up to 1,500 °F (816 °C).
Complete proximity protection for AR-FF requires:
Aluminized hood or helmet cover with neck shroud
Aluminized jacket and pants complete with vapor barrier insulated liner