• Alumina Trihydrate

A white, translucent powder that is also commonly called aluminum hydroxide. Alumina trihydrate is an inert, non toxic mineral filler used primarily for flame retardancy and smoke suppression. Alumina trihydrate is produced from refining raw bauxite ore. There are two processes to refine bauxite; the Sintered process or the Bayer process. When refining bauxite ore, two products are produced; metallurgical and chemical grade alumina.  Alumina trihydrate is chemical grade alumina. Alumina trihydrate has three (3) molecules of water encapsulated in the ore. When compounds containing alumina trihydrate are introduced to elevated temperatures, alumina trihydrate endothermically releases water vapor. The water vapor released imparts flame retardancy and smoke suppression.  By volume, alumina trihydrate is the most commonly used flame retardant and smoke suppressant for industrial applications. Beside the flame retardancy and smoke suppression, alumina trihydrate is an excellent polymer extender and mineral filler. Other benefits to using alumina trihydrate are that it is environmental safe, non toxic and halogen free.

Typical Chemical Properties Typical Physical Properties
Aluminum Oxide (AL2O3) 64.900% Specific Gravity 2.42
Silica (SiO2) 00.010% Mohs Hardness 3
Ferric Oxide (Fe2O3) 00.009% Brightness (Hunter L) 94
Soluble Soda (Na2O) 00.015% Index of Refraction 1.57
Total Soda 00.280%
Loss on Ignition (H2O@550F) 34.600%
  • Surface Modified Alumina Trihydrate

Custom Grinders Sales, Inc. introduces our “SM” line of surface modified alumina trihydrate products. Custom Grinders Sales, Inc. uses the latest technology in surface modification to ensure complete and uniform particulate modification. With surface modification, alumina trihydrate particles can be rapidly and completely dispersed in any polymer system. With complete dispersion, processability is improved and higher loading levels can be achieved with improved properties. Surface modified alumina trihydrate also increases physical properties of polymer systems. Mechanical properties improved include; tensile, flexural an impact. Moisture barrier is increased which can improve dielectric properties. With higher loading levels and improved dispersion, flame retardancy and smoke suppression can be improved. Selected surface modifications can also yield hydrophobic properties. Surface modified alumina trihydrate can be used in almost all INDUSTRY/MARKETS.