Hymod® M9400SP is a high performance, low particle size, precipitated alumina trihydrate (ATH or hydrated alumina) utilized as a flame retardant and smoke suppressant in elastomeric applications. ATH is the most frequently used flame retardant in the world. ATH is a very effective flame retardant due to its thermodynamic properties which absorb heat and release water vapor. Alumina trihydrate releases its 35% water of crystallization as water vapor when heated above 205°C. The resulting endothermic reaction cools the product below flash point, reducing the risk of fire and acts as a vapor barrier to prevent oxygen from reaching the flame.