Drawing No. EH–MT–021 // Engineering Materials
Silicon Carbide Ceramic Properties
Reviewed August 2026
Hexoloy SA is a dense sintered silicon-carbide ceramic with very high stiffness, hardness, thermal conductivity and corrosion resistance.
Representative properties
The stated basis, temperature and direction are part of the value. Switch units without changing the physical reference.
What changes these properties?
Engineering variability
- Saint-Gobain publishes approximately 410 GPa on general Hexoloy SA material/application pages and 430 GPa on several finished-shape datasets; this reference therefore shows 410–430 GPa rather than a false single constant.
- Strength is flaw-statistical and depends on surface finish and test method.
- Thermal conductivity decreases substantially with temperature.
- Different SiC processing routes—sintered, siliconized, nitride-bonded, recrystallized—have different properties.
- Oxidizing/non-oxidizing atmosphere changes usable high-temperature limits.
Selection note
Excellent for seals, semiconductor equipment, heat-transfer parts, furnace fixtures, armor and chemically aggressive wear components.
Where a property is shown as qualitative rather than numeric, that is intentional: the selected source or the material physics does not justify a single comparable scalar.
How to interpret this material
Stiffness
Young’s modulus describes elastic stiffness. For crystals and composites, orientation can make one scalar modulus only a directional reference.
Strength / failure
Ductile metals can use yield and tensile strength. Brittle ceramics/semiconductors and anisotropic composites require fracture, flexural or directional strength descriptions instead.
Thermal response
Conductivity, heat capacity and expansion are temperature dependent. The last column is a melting or transition descriptor only where that physical concept is appropriate.
Technical sources
The database favors manufacturer, industry, government or academic technical references and labels secondary condition-specific datasets when a primary source does not expose a complete property set.