Aluminum oxide substrate

ceramicfor the electronics industrythick-film

Product description
96% alumina (Al2O3) substrates are high-density ceramic plates offering excellent thermal conductivity, low dielectric loss and high dielectric strength for electronic and energy applications. They resist high temperature and chemical attack, and are supplied in standard sizes or customized formats with precision machining for thick‑film/thin‑film resistors, LEDs, energy storage gaskets and related components.

Technical capabilities

• Proprietary formulation and grade control
• Multiple forming methods: casting, dry pressing, isostatic pressing and other ceramic forming technologies
• Precision dimensional machining and surface finishing
• Custom sizes, thicknesses and tolerances on request

Advantages

• Consistent, controllable material composition and purity
• Low impurity content and high powder purity
• Stable production through controlled batch powder processing
• Material and performance parameters selectable by application

Powder material properties (table)
Category | Test item | Unit | 75 (porcelain) | 95 (porcelain)
Granulated powder particle size | μm | 80–100 | 80–100
Flow time | s/50g | <80 | <70
Bulk density | g/cm3 | 1.0–1.1 | 1.10–1.25
Moisture content | wt% | 0.1–0.5 | 0.1–0.5
Loss on ignition | wt% | 5.5–6.5 | 5.5–6.5
Pressed powder density | g/cm3 | 2.0–2.2 | 2.20–2.30
Shrinkage | % | 15.0–16.0 | 15.0–16.0
Sintered density | g/cm3 | 3.20–3.40 | 3.70–3.75
Flexural strength | MPa | 230–280 | 350–400

Features

• Good thermal shock resistance
• Low warpage after firing and machining
• High temperature resistance and excellent acid/alkali corrosion resistance
• Excellent machinability for precision components

Applications

• Thick‑film and thin‑film chip resistors
• Low‑power LEDs and optoelectronic substrates
• Gaskets and insulating supports for energy storage systems and charging stations

96 Alumina material properties (summary table)
Project / Test condition | Unit | A1296 | A1296A | A2296 | A996
Material | - | - | - | 96% | 96% | 96% | 100%
Appearance | - | - | - | White dense | White dense | White dense | White dense
Surface roughness (Ra) | μm | 0.2–0.6 | 0.2–0.6 | 0.2–0.6 | 0.2–0.6
Density | g/cm3 | ≥3.70 | ≥3.60 | ≥3.75 | ≥3.8
3‑point bend strength | MPa | ≥380 | ≥350 | ≥400 | ≥450
Vickers hardness (load 4.9 N) | GPa | ≥14 | ≥13 | ≥14 | ≥14
Water absorption | % | 0 | 0 | 0 | 0
Thermal conductivity (@25°C) | W/(m·K) | ≥22 | ≥19 | ≥24 | ≥27
Linear thermal expansion (25–500°C) | x10^-6/°C | 6.6–7.5 | 6.6–7.5 | 6.6–7.5 | 6.6–7.5
Thermal shock resistance (800°C) | time | ≥10 | ≥10 | ≥10 | ≥10
Specific heat | J/(kg·K) | 880 | 780 | - | -
Dielectric constant (1MHz/25°C) | - | 9–10 | 9–10 | 9–10 | 9–10
Dielectric loss (1MHz/25°C) | x10^-4 | ≤3 | ≤0.5 (best grade) | ≤3 | ≤3
Volume resistivity (25°C) | Ω·cm | >10^14 | >10^14 | >10^14 | >10^14
Withstand / breakdown voltage | kV/mm | >12 | >15 (A996 top grade) | >12 | >12
Optical reflectance | % | >92 | >95 | >88 | >90
Whiteness (whiteness meter) | - | >88 | >86 | >88 | -

Standard sizes (sizes and available thicknesses)
Available thickness options (mm): 0.38, 0.5, 0.6, 0.635, 0.65, 0.75, 1.0, 1.2, 1.5, 2.0
84×84 | Available thicknesses: 0.38 √, 0.5 √, 0.6 √, 0.635 √, 0.65 √, 0.75 √, 1.0 √, 1.2 √, 1.5 √, 2.0 √
109×109 | Available thicknesses: 0.38 √, 0.5 √, 0.6 √, 0.635 √, 0.65 √, 0.75 √, 1.0 √, 1.2 √, 1.5 √, 2.0 √
120×120 | Available thicknesses: 0.38 √, 0.5 √, 0.6 √, 0.635 √, 0.65 √, 0.75 √, 1.0 √, 1.2 √, 1.5 √, 2.0 √
127×127 | Available thicknesses: 0.38 √, 0.5 √, 0.6 √, 0.635 √, 0.65 √, 0.75 √, 1.0 √, 1.2 √, 1.5 √, 2.0 √
132×142 | Available thicknesses: 0.5 √, 0.6 √, 0.635 √, 0.65 √, 0.75 √, 1.0 √, 1.2 √, 1.5 √, 2.0 √
136×151 | Available thicknesses: 0.5 √, 0.6 √, 0.635 √, 0.65 √, 0.75 √, 1.0 √, 1.2 √, 1.5 √, 2.0 √
137×157 | Available thicknesses: 0.5 √, 0.6 √, 0.635 √, 0.65 √, 0.75 √, 1.0 √, 1.2 √, 1.5 √, 2.0 √
138×190 | Available thicknesses: 0.5 √, 0.6 √, 0.635 √, 0.65 √, 0.75 √, 1.0 √, 1.2 √, 1.5 √, 2.0 √
130×200 | Available thicknesses: 0.5 √, 0.6 √, 0.635 √, 0.65 √, 0.75 √, 1.0 √, 1.2 √, 1.5 √, 2.0 √

Characteristics / Technical specifications

• Material: Al2O3 (typical 96% grades; A996 listed up to 100%)
• Sintered density: ~3.20 to ≥3.80 g/cm3 depending on grade
• Thermal conductivity (@25°C): typically ≥19–27 W/(m·K) depending on grade
• Coefficient of linear thermal expansion (25–500°C): ~6.6–7.5 x10^-6/°C
• Thermal shock resistance (800°C): ≥10 (time measure)
• Three‑point flexural strength: ~230–450 MPa depending on grade
• Vickers hardness (4.9 N): ≥13–14 GPa
• Dielectric constant (1MHz/25°C): ~9–10; dielectric loss very low
• Volume resistivity: >10^14 Ω·cm; breakdown voltage: >12 kV/mm (higher for top grades)
• Standard sizes and multiple thickness options; precision machining and customization available