32640 - Porcelain, Steatite & other Ceramic electrical products
3264010 - - Porcelain electrical products: Wet process voltage porcelain Pintype insulators & Line posts
3264014 - - Porcelain electrical products: Suspension type insulators: =<7.5 in. disc
3264015 - - Porcelain electrical products: Suspension type insulators: >7.5 in. disc
3264016 - - Porcelain electrical products: Switch & Bus insulators + Cap & Pin & Post types
3264017 - - Porcelain electrical products: all other + Guy strain insulators & Spools
3264018 - - Porcelain electrical products: Wet process voltage porcelain component parts
3264029 - - Porcelain electrical products: all dry process electrical porcelain (+ Porcelain parts for Wiring devices, Fuses, Circuit breakers, Radio, etc.
3264041 - - Steatite electrical products
3264051 - - Ferrites: Ceramic permanent magnets
3264052 - - Ferrites: other Ferrites, except electronic application
3264055 - - Other Ferrites
3264061 - - Alumina materials for Electronic application
3264098 - - Beryllia, Titanate & other Ceramic electrical products
3264XX0 - - Porcelain electrical supplies (Miscellaneous - Volume)
3264XX2 - - Porcelain electrical supplies (Miscellaneous - Speciality)