Aluminum hydroxide is considered the world's most important mineral flame retardant. It is halogen-free and environmentally friendly.
Properties:
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)
Technical data: 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 % pHvalue (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
Application: As a flame retardant for epoxy resins (casting and laminating resins, gel coats).
Addition rates: 25-50 % by weight (25 % in laminates, up to 50 % in topcoats). 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
Customer review: "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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