What is "phos-chek"

right|300px|thumb|upright=1.5| C-130E Hercules equipped with a Modular Airborne Fire Fighting System makes a Phos-Chek fire retardant drop in Southern California in October 2003.

Phos-Chek is a brand of long-term fire retardants, class A foams, and gels manufactured by ICL Performance Products in Ontario, California and Moreland, Idaho.