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Synthetic Boehmite

Synthetic Boehmite "ALCUBE®"

Our "ALCUBE" is synthetic boehmite(AlOOH) of very fine cubic particles.
It can be used as a flame retardant or thermal conductive filler for plastics.


General Characteristics
Composition formula AlOOH
Appearance White powder
Crystal system Orthorhombic
Specific gravity 3.02-3.05
Mohs hardness 3.5
Refractive index 1.64-1.67
Decomposition temperature Approx. 500℃
Solubility Insoluble in water
Hardly insoluble in acid,
alkaline at room temperature
Typical data
Average particle size(μm) 1.0
Specific surface area(m2/g) 4.0
Bulk density(g/ml) 0.6
Moisture(%) 0.1
Loss on ignition(%) 17.0
Particle size distribution
Particle size distribution
Thermal conductivity
Thermal conductivity
Electrical properties
  AlOOH Al2O3
Electrical resistivity(Ω・cm) 6.2×1014 7.3×1015
Relative permittivity 5.9 5.7
※70% in EEA resin
Slide left or right to see the whole table▶
Acid resistant and flame retardancy
  ALCUBE (Ref.) Magnesium hydroxide Formulation
Acid resistant (weight loss rate) ※(%) 0.1 56.6 75% in LDPE
Vertical flammability of UL-94
[1/8 inches thickness]
V-0 V-0 70% in EVA

※Condition: Sulfuric acid of 10%, 40℃, 2h


  • Flame retardant
  • Thermal conductive filler
  • Light diffuser
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