Hymod® M855SP is a high performance, high surface area, low particle size alumina trihydrate (ATH or hydrated alumina) utilized as flame retardants and smoke suppressants in elastomeric applications. ATH is the most frequently used flame retardant in the world. The Hymod M855SP grade is a vinyl silane treated ATH for improved processing and physical properties of thermoset and thermoplastic compounds. 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.