Blending Multiple Huber Flame Retardants and Smoke Suppressants

Compounders have an array of product choices when selecting specific flame retardant and smoke suppressant grades, and the selection depends on the specific flame spread or smoke generation test methods required for the application. 
In some cases, a blend of Alumina Trihydrate (ATH) and Magnesium Hydroxide (MDH) can assist in passing some flame spread tests because of the different temperatures at which ATH and MDH decompose to generate water molecules. 

Typical Physical Property Comparison of Alumina Trihydrate (ATH) and Magnesium Hydroxide (MDH)

Property ATH MDH
Physical Form Powder Powder
Particle morphology Hexagonal platelet Hexagonal platelet
Color White White
Specific gravity g/cm3 2.42 2.36
pH value 9 - 10 10 - 11
Mohs hardness 2.5 - 3.5 2.0 - 3.0
Refractive index 1.57 1.58
Decomposition temperature 220oC / 428oF 330oC / 626oF
Heat of decomposition, cal/g 280 328
Theoretical loss of ignition 34.6% 31.0%

Decomposition temperature of ATH and MDH:

ATH + heat  ->  Al2O3 + Water   220ºC      
MDH + heat  ->  MgO  + Water   330ºC

Today when compounders are trying to find environmentally-friendly replacements for antimony oxide and halogenated additives, Kemgard® flame retardants and smoke suppressants work well with both ATH and MDH to help achieve your target levels of flame retardance and smoke suppression.

Huber's Techology Center in Fairmount, Georgia (U.S.), is staffed with knowledgeable scientists who are available to assist you with your formulating questions.  Click Here and Contact Us to get more information.