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ZnO Varistor vs Aluminum Nitride and 2 more: properties

ZnO VaristorAluminum NitridePZTPZT-4

Mechanical

Strength, stiffness, ductility and hardness at room temperature.

Elastic (Young's) Modulus

120 GPa17.4 Msi
320 GPa46.4 Msi
61 GPa8.8 Msi
70 GPa10.2 Msi

Shear Modulus

46 GPa6.7 Msi
128 GPa18.6 Msi
23 GPa3.3 Msi
26 GPa3.8 Msi

Bulk Modulus

100 GPa14.5 Msi
205 GPa29.7 Msi
55 GPa8 Msi
60 GPa8.7 Msi

Poisson's Ratio

0.3
0.24
0.31
0.31

Compressive Strength

600 MPa87 ksi
2,100 MPa305 ksi
600 MPa87 ksi
520 MPa75.4 ksi

Flexural Strength

110 MPa16 ksi
330 MPa47.9 ksi
85 MPa12.3 ksi
85 MPa12.3 ksi

Fracture Toughness (K_IC)

1.3 MPa·√m1.2 ksi·√in
3 MPa·√m2.7 ksi·√in
1 MPa·√m0.91 ksi·√in
1 MPa·√m0.91 ksi·√in

Hardness, Vickers

400 HV
1,100 HV
350 HV
320 HV

Hardness, Mohs

4.5
7.5
5
5

Tensile Strength (Ultimate)

200 MPa29 ksi
75 MPa10.9 ksi
75 MPa10.9 ksi

Elongation at Break

0%
0.1%

Shear Strength

200 MPa29 ksi
65 MPa9.4 ksi

Hardness, Knoop

1,200 HK
330 HK
300 HK

Physical

Density and transition temperatures.

Density

5.55 g/cm³0.2 lb/in³
3.29 g/cm³0.12 lb/in³
7.75 g/cm³0.28 lb/in³
7.5 g/cm³0.27 lb/in³

Melting Point (Solidus)

1,975°C3,587 °F
2,200°C3,992 °F

Porosity

3%
0.5%
1%
1%

Refractive Index

2.15

Thermal

How each material carries heat and how hot it can run.

Thermal Conductivity

18 W/m·K10.4 BTU/hr·ft·°F
175 W/m·K101 BTU/hr·ft·°F
1.3 W/m·K0.75 BTU/hr·ft·°F
1.3 W/m·K0.72 BTU/hr·ft·°F

Specific Heat Capacity

520 J/kg·K0.12 BTU/lb·°F
740 J/kg·K0.18 BTU/lb·°F
380 J/kg·K0.09 BTU/lb·°F
350 J/kg·K0.08 BTU/lb·°F

Thermal Expansion (CTE, 20–100 °C)

6.5 µm/m·K3.6 µin/in·°F
4.5 µm/m·K2.5 µin/in·°F
4 µm/m·K2.2 µin/in·°F
4 µm/m·K2.2 µin/in·°F

Max Service Temperature (continuous)

125°C257 °F
1,000°C1,832 °F
175°C347 °F
160°C320 °F

Min Service Temperature

-55°C-67 °F
-269°C-452 °F
-50°C-58 °F
-50°C-58 °F

Electrical

Conductivity and insulation.

Electrical Resistivity

1×10⁸ Ω·m3.94×10¹⁵ µΩ·in
1×10¹² Ω·m3.94×10¹⁹ µΩ·in
1×10¹⁰ Ω·m3.94×10¹⁷ µΩ·in
1×10¹¹ Ω·m3.94×10¹⁸ µΩ·in

Dielectric Strength

0.2 kV/mm5.1 V/mil
17 kV/mm432 V/mil
5 kV/mm127 V/mil
10 kV/mm254 V/mil

Dielectric Constant (1 MHz)

500
8.8
1,700
1,300

Dissipation Factor (1 MHz)

0.05
5×10⁻⁴
0.02
0.004

Volume Resistivity

1×10¹⁰ Ω·cm
1×10¹⁴ Ω·cm
1×10¹² Ω·cm
1×10¹³ Ω·cm

Chemical & Environmental

Corrosion and environmental resistance (0–100 scores).

Corrosion Resistance

45 / 100
82 / 100
60 / 100
65 / 100

Manufacturability

FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.

Machinability

10 / 100
5 / 100
8 / 100
12 / 100

Polishability

60 / 100
80 / 100
70 / 100
70 / 100

Sintering / Firing Temperature

1,150°C2,102 °F
1,800°C3,272 °F
1,250°C2,282 °F
1,275°C2,327 °F

Sustainability

Primary-production footprint per kilogram.

Embodied Energy (primary production)

55 MJ/kg23,646 BTU/lb
250 MJ/kg107,481 BTU/lb
70 MJ/kg30,095 BTU/lb

Embodied Carbon (primary production)

3.6 kg CO₂/kg
20 kg CO₂/kg
5.5 kg CO₂/kg

Embodied Water

200 L/kg24 gal/lb
60 L/kg7.2 gal/lb

Typical Recycled Content

5%
0%
5%

Common Calculations

Ratios derived from the values above.

Specific Stiffness (E / density)

21.6 MN·m/kg
97.3 MN·m/kg
7.9 MN·m/kg
9.3 MN·m/kg

Thermal Diffusivity

6.2 mm²/s
71.9 mm²/s
0.4 mm²/s
0.5 mm²/s

Strength versus weight

Yield strength against density for every ceramic grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.

501002005001,000234567Density (g/cm³)Yield strength (MPa) — log scaleAluminum NitridePZT

Manufacturing and finishing

CapabilityZnO VaristorAluminum NitridePZTPZT-4
Default condition
Relative cost$$$$ High$$$$ High$$$$ High$$$$ High
Min. machined wall
Best machined surface

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Upload a CAD file and FabDigit prices the part in ZnO Varistor and Aluminum Nitride side by side — material, machining time, tolerance and finish in one quote. Certified material data ships with the order on request.

Typical handbook values for the conditions named above, normalised for comparison. Hardness on non-Brinell scales is converted approximately for charting only. Request certified data with your order for design-critical properties.