High Purity and Density：Purity up to 99.999% or higher, with a dense, non-porous surface and excellent airtightness; helium permeability as low as 1×10⁻¹⁰ cm³/s.

High-Temperature Resistance and Thermal Performance： Withstands high temperatures up to 2200°C, and its strength increases with rising temperature. It has excellent thermal shock resistance and anisotropic thermal conductivity (60 W/(m·K) in the a-direction at 200°C, and only 2.60 W/(m·K) in the c-direction).

Chemical Inertness： Resistant to corrosion by acids, alkalis, salts, and organic reagents; non-wetting and non-reactive with most molten metals and semiconductor materials.

Electrical and Special Properties： High resistivity (2.4×10¹⁵ Ω·cm), high dielectric strength (56 kV/mm at room temperature), low dielectric constant and dielectric loss tangent, as well as good microwave and infrared transmission performance.

Anisotropy and Mechanical Properties： Exhibits significant anisotropy in mechanical, thermal, and electrical properties; tensile strength is 102 N/mm², and flexural strength is 243 N/mm².