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SB 432
ALUMINUM HYDROXIDE
(ATH)
DESCRIPTION
SB-432 ATH developed especially for SMC, BMC, resin injection and high solids coatings, has a unique particle
size distribution that provides the best possible combination of viscosity, flame, electrical and molding
properties that can be derived from an ATH filler. A closely controlled top size with a large super fine faction
yields rapid dispersion in resin. Excellent mold flow and wet-out characteristics result in superior surface
profile, minimal porosity, even pigmentation, and excellent filler and reinforcement distribution throughout
the molded part.
Chemical Property Unit Typical Value
Al(OH)
3 % 99.6
SiO
2 % 0.005
Fe
2O3 % 0.007
Na
2O (total) % 0.24
Na
2O (soluble) % 0.03
Loss on Ignition (1000 C) % 34.6
Physical Property Unit Typical Value
Screen Analysis
on 325 Mesh % 0.1
through 325 Mesh % 99.9
% on less than 10 microns % 53
Median Particle Diameter Microns 9
BET Surface Area* m
2
/g 2
Free Moisture @105 C % 0.3
Specific Gravity gm/cm
3
2.42
Bulk Density, loose gm/cm
3
0.65
Bulk Density, packed gm/cm
3
1
TAPPI Brightness** 89
Oil Absorption*** ml 28
*
As measured with Micromeritics Tristar surface analyzer (BET)
** TAPPI Brightness measured with the Hunterlab Colorimeter
*** Oil Absorption, ml, boiled linseed oil per 100 gm filler
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