Long-term retardant is the ideal tool for slowing or stopping the spread of wildland fires. Phos-Chek long-term retardants chemically alter wildland fuels to render them non-flammable. The product can be applied by air, via fixed or rotor wing aircraft, or on the ground using standard engines, or one of Perimeter Solutions’ dedicated ground-applied retardant units. All Phos-Chek^® retardants are fully qualified by the USDA Forest Service. They are the safest, most effective, and environmentally friendly products available. Long-term retardant is offered in red iron oxide, fugitive (disappearing) color, and uncolored. Products are available in medium and low viscosity; and as powder and liquid concentrate. To explore the Fire-Trol brand of fire retardants, click here.