8547.10 - Insulating fittings of ceramics:

This category, HTS 8547.10, specifically enumerates insulating fittings that are manufactured entirely from ceramic materials. These fittings are designed for use within electrical machinery, appliances, or equipment, providing crucial insulation. The ceramic composition is the primary defining characteristic, distinguishing these fittings from those made of other materials. Minor metal components, such as threaded sockets, are permitted if they are incorporated during the molding process solely for assembly purposes and do not alter the fundamental insulating nature of the fitting.

This classification is distinct from its sibling categories. HTS 8547.20.00.00 covers insulating fittings made of plastics, while HTS 8547.90.00 encompasses other miscellaneous insulating fittings not specified elsewhere. Therefore, the key differentiating factor for 8547.10 is the exclusive use of ceramic as the base insulating material.

Within this ceramic fittings category, further subdivisions exist to refine classification based on specific application or type. HTS 8547.10.40.00 details ceramic insulators designated for use in the manufacturing of spark plugs for natural gas-fueled, stationary, internal combustion engines. All other ceramic insulating fittings not falling under this specific application are classified under the residual category HTS 8547.10.80.00. This hierarchical structure allows for precise identification of ceramic insulating components based on their intended end-use.