Alumina  Substrate(HR)
  • Product Name: Alumina Ceramic Substrate (HR, High Reflectivity)

  • Product Features: High visible light reflectivity, high flexural strength, high insulation, large size, and laser-processable

  • Application Scenario: COB packaging of LED chips

Performance Parameters
Material Grade HR
Content of Al2O3 wt % >90%
Appearance     White
Roughness Ra μm 0.2~0.5
Density Drainage g/cm3 ≥3.75
Light Reflectance 450nm/1mm % 98
Mechanical Characteristics Flexural Strength Three Point Bending Resistance MPa >380
Fracture Toughness Indentation Method MPa.m½ 3.0
Vickers Hardness Load 4.9N GPa 14
Young's Modulus Stretching Method Gpa 330
Thermal Characteristics Coefficient of Linear Thermal Expansion 25~800℃ x10-6 /K
7.7
Thermal Conductivity 25℃ W/(m.k) >22
Specific Heat Capacity 25℃ J/(kg.k) 750
Electrical Characteristics Dielectric Constant 1MHz,25℃ - 9.4
Dielectric Loss Angle 1MHz,25℃ x10-4 ≤3
Volume Resistivity 25℃ Ω.cm ≥10¹⁴
Dielectric Strength DC KV/mm ≥15

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