Aluminum hydroxide is considered the world's most important mineral flame retardant. It is halogen-free and environmentally friendly.
- Easy to mix in
- Highly flame retardant (water splitting at 200 °C)
- Low hardness 3
- Density 2.4 g/cm3
- High whiteness (Y color value >94)
- Coefficient of thermal expansion 15*10-6K-1 (at 20 - 300 °C)
Chemical composition: Al(OH)3 99.6 %, Fe2O3 0.01 %, SiO2 0.008 %, Na2O 0.32 %
Humidity: 0.15 %.
Grain size: Average grain size 1.0 μm + 325 mesh < 0.1 %.
Bulk density (kg·m−3): (loose) 0.25, (packed) 0.6
Oil count: 59 ml/100 g
Whiteness: 96 %
pH value (Mixture for pH measurement 30 % flame retardant in water, at room temperature): 9 - 10
Specific gravity: 2.42
Refractive index: 1.57
Hardness (Mohs): 3
As a flame retardant for epoxy resins (casting and laminating resins, gel coats).
25-50 % by weight (25 % in laminates, up to 50 % in top coats). Preliminary tests for the specific application are recommended.
Structure of the laminate in the film:
1) 8 layers of glass fabric tape 220 g/m2 (Art. No. 2001131)
2) laminating resin epoxy resin L + hardener S + 25 % aluminum hydroxide
"The aluminum hydroxide powder was easily and homogeneously mixed into the resin/hardener mixture. Laminating the plies was trouble-free. The resin was given a milky color by the addition and became slightly thixotropic (non-runny, stable)."
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Ratings for Flame retardant (Alumiminium hydroxide)