Phos-Chek

Phos-Chek is a brand of fire retardants, class A foams, and gels manufactured by Perimeter Solutions, used for firefighting purposes. The retardants are applied to homes and vegetation ahead of wildfires to prevent combustion. Phos-Chek is produced in several colors, including off-white, red iron oxide, and a fugitive mixture, and contains components such as ammonium polyphosphate and diammonium phosphate. Concerns have been raised about the potential harms of Phos-Chek, including effects on fish and aquatic life, and the US Forest Service has been sued over its use of the product. The phosphate and sulfate salts in Phos-Chek act as fire retardants and prevent combustion of cellulosic materials, while guar gum and clay are thickening agents.learn more on wikipedia