Flame retardant (Alumiminium hydroxide)

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 

Technical data:
Chemical composition: 99.7 % Al(OH)₃
Na₂O (water soluble):  0.005 %
Moisture: 0.1 %
D₁₀: 3 μm
D₅₀: 20 μm 
D₉₀: 50 μm 
Sieve residue (> 45 μm): 15 %
Spec. surface area (BET): 0.5 m²/g
Oil absorption: 18 ml/100 g
Specific conductivity: 10 μS/cm
Bulk density: 950 kg/m³
Whiteness: 87 %

Material constants
Chemical formula: Al(OH)₃
Crystal structure: Gibbsite
Mohs hardness: 3
Density: 2.4 g/cm³ 
Refractive index: 1.58

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