Duty Rate (from China)
Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
Products classified under HTS 8546.20.00.90
Alumina Ceramic Post Insulators
Cylindrical post insulators made from 95% alumina ceramic for use in electrical substations to support busbars and equipment up to 36kV. They offer high puncture resistance and tracking resistance in polluted environments. Falls under 8546.20.00.90 as other ceramic electrical insulators.
High-Voltage Porcelain Suspension Insulators
These ceramic suspension insulators are designed for supporting high-voltage overhead power transmission lines, typically rated 69kV or higher. Made from high-alumina porcelain, they provide electrical insulation and mechanical strength under extreme weather conditions. Classified under 8546.20.00.90 as ceramic electrical insulators not specified elsewhere in the subheading.
Steatite Ceramic Bushings
Steatite (magnesium silicate) ceramic bushings used in low to medium voltage switchgear for conductor insulation through enclosure walls. Known for low electrical loss and high thermal stability up to 1000°C. Classified in 8546.20.00.90 as other ceramic electrical insulators.
Cordierite Ceramic Stand-Off Insulators
Threaded stand-off insulators made from cordierite ceramic for mounting electrical components in high-frequency RF equipment. They provide phase-to-phase insulation with low dielectric constant (6.0 max). HTS 8546.20.00.90 covers these other ceramic electrical insulators.
Zirconia Ceramic Spark Plug Insulators
High-strength zirconia insulators for automotive and industrial spark plugs, providing 30kV+ dielectric strength and thermal shock resistance. The ceramic core insulates the central electrode from the metal shell. Classifies under 8546.20.00.90 as other ceramic electrical insulators.
Porcelain Pin-Type Insulators
Pin-type porcelain insulators for distribution poles (11-33kV class) with cemented steel pins for mechanical attachment. Brown glaze finish resists contamination tracking. HTS 8546.20.00.90 for other ceramic electrical insulators.
Silicon Carbide Surge Arrestor Insulators
Ceramic housings for SiC gapless surge arrestors protecting transformers from lightning strikes (up to 200kA). Porcelain body with high mechanical strength (12kN cantilever). 8546.20.00.90 classification for ceramic electrical insulators.
Industrial Kiln Ceramic Insulator Tubes
High-temperature alumina tubes insulating heating element wires in electric kilns and furnaces (up to 1700°C). Provides electrical isolation in oxidizing atmospheres. Classified 8546.20.00.90 as other ceramic electrical insulators.
Multilayer Ceramic Feedthrough Insulators
Hermetic feedthrough insulators with multiple gold-plated pins in 99.5% alumina body for vacuum chamber penetrations in semiconductor equipment. Vacuum tight to 1x10^-9 Torr. 8546.20.00.90 for other ceramic electrical insulators.
Laboratory Mullite Electrical Insulators
Mullite (3Al2O3·2SiO2) ceramic standoffs and tubes for laboratory high-voltage testing equipment and spark testers. Excellent arc resistance and machinability. HTS 8546.20.00.90 classification.