10/06/2026
PHOS-CHEK® 259 became the first fire retardant approved for use on fixed-tank helicopters in 1971.
Today, our PHOS-CHEK® 259-Fx formulation remains the only long-term retardant with that specific USDA Forest Service qualification. Why? Because it meets the industry's most stringent corrosion requirements, protecting sensitive magnesium components on internal tank systems while delivering ultra-high visibility from the air.
Learn more about the technology behind PHOS-CHEK 259: https://loom.ly/lHyLsU0