The core function of porcelain (ceramic) sleeves is to serve as a multifunctional structural component, utilizing their excellent insulation, heat resistance, corrosion resistance, and mechanical properties to ensure the safe, reliable, and stable transmission of current, signals, heat, or substances under extreme or precise conditions, while also playing a critical role in isolation, support, and protection. It is an indispensable basic component in modern power, electronics, and high-temperature industries.