How Our Fire Retardant Additives Work

Alumina Trihydrate | Magnesium Hydroxide | Kemgard Smoke Suppressants

Alumina Trihydrate (ATH)

The world’s most widely used flame retardant is Alumina Trihydrate (ATH). One of the world’s largest suppliers of ground and precipitated ATH is Huber Engineered Materials. 

Here’s how ATH works: at approximately 428°F (220°C), the three water molecules in ATH are released in an endothermic reaction. The released water molecules quench the surface of the surrounding materials, thus providing flame retardance and smoke suppression (refer to illustration below to the left).

ATH is a more desirable flame retardant versus halogenated compounds because it does not emit toxic smoke when burned.

Al2O3-(H2O)3 plus heat -> Al2O3 + 3 H2O

Magnesium Hydroxide (MDH)

Magnesium Hydroxide (MDH) provides flame retardance similar to ATH, but it dehydrates at 626°F (330°C). Like ATH, it contains no halogens or heavy metals.

Kemgard® Flame Retardants and Smoke Suppressants

Huber's Kemgard® products chemically influence the formation of organic char, effectively insulating the polymer from the heat and oxygen source thereby lowering heat and smoke release.  Kemgard grades are manufactured by patented processes in which molybdates are precipitated on an inert core.  This "coated core" approach makes more efficient use of the molybdate species by maximizing the active surface area, and at a much lower cost than pure molybdate chemicals, such as ammonium octamolybdate (AOM).

Contact Us or visit our Product Finder to learn more and obtain samples of our flame retardants and smoke suppressants.