Aluminium hydroxides are used as non halogen flame retardant filler in plastics and rubber in order to retard the expansion of fire in environmentally friendly way.
The flame retardant effect of ATH is based on the endothermic decomposition into aluminium oxide and water: 2Al(OH)3→Al2O3 + 3H2O
ATH decomposes at about 220 oC.
While burning the polymer is protected against the quick decomposition i.e. burning is retarded.
Aluminium hydroxides are used for the production of low-smoke and halogen free flame retarders.
Adventages of aluminium hydroxides:
Dry are used as raw material for the production of below products: synthetic zeolites, aluminum compounds, glass, ceramics, refractory materials, carpet backings, artificial marble, roofing
Ground, viscosity optimized and are mainly used as environmentally friendly filler for the production of the following products: artificial marble, roofing, carpet backing, coatings of PUR foam, polyester resins, cross linked elastomers, PVC, dispersions, polyurethans, adhesives