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Engineering Porcelain

Engineering porcelain is an oxide-based engineering ceramic.

The properties of engineering porcelain include ten common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare engineering porcelain to other oxide-based engineering ceramics (top) and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Dense Celsian Porcelain (IEC 60672 Type C-420)Dense Cordierite Porcelain (IEC 60672 Type C-410)
Dense Lime-Based Porcelain (IEC 60672 Type C-430)Dense Zircon-Based Porcelain (IEC 60672 Type C-440)
High Strength Aluminous Porcelain (IEC 60672 Type C-130)Lithia Porcelain (IEC 60672 Type C-140)
Plastic-Processed Cristobalite Porcelain (IEC 60672 Type C-112)Plastic-Processed Siliceous Porcelain (IEC 60672 Type C-110)
Pressed Siliceous Porcelain (IEC 60672 Type C-111)Regular Aluminous Porcelain (IEC 60672 Type C-120)

Mechanical Properties

Compressive (Crushing) Strength

590 MPa 86 x 103 psi

Elastic (Young's, Tensile) Modulus

67 to 150 GPa 9.7 to 21 x 106 psi

Flexural Strength

43 to 160 MPa 6.2 to 23 x 103 psi

Fracture Toughness

2.0 MPa-m1/2 1.8 x 103 psi-in1/2

Knoop Hardness

600

Poisson's Ratio

0.17

Rockwell R Hardness

60

Shear Modulus

34 GPa 4.9 x 106 psi

Tensile Strength: Ultimate (UTS)

130 MPa 19 x 103 psi

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 Hz

5.0 to 10

Dielectric Constant (Relative Permittivity) At 1 MHz

6.5

Dielectric Strength (Breakdown Potential)

11 to 25 kV/mm 0.43 to 1.0 V/mil

Electrical Dissipation At 1 Hz

0.0043 to 0.028

Electrical Dissipation At 1 MHz

0.00043 to 0.013

Electrical Resistivity Order of Magnitude

9.0 to 12 10x Ω-m

Other Material Properties

Density

2.3 to 3.0 g/cm3 140 to 190 lb/ft3

Maximum Temperature: Mechanical

1170 °C 2130 °F

Maximum Thermal Shock

170 to 290 °C 330 to 550 °F

Specific Heat Capacity

600 to 1000 J/kg-K 0.14 to 0.24 BTU/lb-°F

Thermal Conductivity

1.8 to 6.5 W/m-K 1.0 to 3.8 BTU/h-ft-°F

Thermal Expansion

2.0 to 6.6 µm/m-K

Common Calculations

Stiffness to Weight: Axial

16 to 29 points

Stiffness to Weight: Bending

49 to 65 points

Strength to Weight: Axial

12 to 16 points

Strength to Weight: Bending

19 to 25 points

Thermal Diffusivity

0.73 to 3.9 mm2/s

Thermal Shock Resistance

11 to 53 points

Followup Questions

How are the material properties defined?How does engineering porcelain compare to other oxide-based engineering ceramics?
How does it compare to other ceramic materials?

Further Reading

ASTM C242: Standard Terminology of Ceramic Whitewares and Related Products

IEC 60672-3: Ceramic and glass-insulating materials - Part 3: Specifications for individual materials

Springer Handbook of Condensed Matter and Materials Data, W. Martienssen and H. Warlimont (editors), 2005

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015