Patent ID: 7571912

Claim:
A stable fire retardant mixture for decelerating and trapping projectiles comprising at least in part heavy metals, said mixture at least reducing leaching of said heavy metals, said mixture at least comprising: a resilient granular material; a hydrated super absorbent polymer (SAP) gel, wherein said hydrated SAP gel is intimately mixed with said resilient granular material to yield a first interim mixture, and wherein said hydrated SAP gel adheres to said resilient granular material, resisting removal by either aqueous solutions or abrasion from said projectiles; at least one first additive, wherein said first additive chemically stabilizes at least said hydrated SAP gel, and wherein said first additive facilitates maintaining the pH of at least said hydrated SAP gel at above about 4.5, and wherein said first additive forms a passive coating on metallic particles introduced to said stable fire retardant mixture; at least one second additive, wherein said second additive at least reduces said leaching of heavy metals, and wherein said first and second additives remain as powdery solids in said stable fire retardant mixture, and wherein at least one of said first and second additives at least prevent the leaching of phosphate, and wherein at least one of said first and second additives retards the growth of mold and bacteria, and wherein said first and second additives are intimately mixed with said first interim mixture to yield said stable fire retardant mixture.