What is the red retardant dropped from planes?

10/28/2020 (Permalink)

Retardant Falling on top of houses.

Fire retardants are used to slow the spread or intensity of a fire. They help firefighters on the ground to control and contain a fire and help protect properties. Fire retardants may also be dropped from aircraft during firefighting operations. Sometimes a red colored pigment, made from iron oxide, is added so that those spraying can see where they have released the fire retardant.

Fire retardants consist of detergent chemicals made from a combination of wetting agents and foaming chemicals, fertilizers (ammonium and diammonium sulfate and ammonium phosphate) mixed with thickeners (guar gum) and corrosion inhibitors (for aircraft safety). They are mixed with water to form a foam or slurry. Examples include, Angus Forexpan S and Phos-Chek WD-881, Phos- Chek D75-F and Phos-Chek D75-R.

How do fire retardants work?

Fire retardants are mixed with water before they are used in the environment. After the water has completely evaporated, the remaining chemical residue retards vegetation or other materials from igniting, until it is removed by rain or erosion. Fire retardants also work by binding to plant material (cellulose) and preventing combustion.

SERVPRO of San Luis Obispo has been very experienced with this retardant in our area during the wildfires that have been occurring. We specialize in fully cleaning up the retardant which can damage the exterior of your property.