3604.90.00.00 - Other

This HTS category, 3604.90.00.00, encompasses pyrotechnic articles that are not specifically classified as fireworks under subheading 3604.10. This residual category is for a diverse range of signaling devices and other pyrotechnic items that do not fit the definition of entertainment fireworks, which are primarily designed for visual and auditory displays.

Key examples within this classification include signaling flares used for distress or marking purposes, rain rockets for weather signaling, and fog signals designed to alert ships or trains. It also covers other pyrotechnic articles whose primary function is communication, signaling, or producing specific atmospheric effects, as opposed to general celebration or entertainment.

Unlike fireworks (3604.10), which are characterized by their elaborate and often colorful displays of light and sound for entertainment, the items in 3604.90 are distinguished by their functional purpose, typically involving illumination, audible signals, or smoke generation for practical applications in safety, navigation, or signaling. The classification hinges on the intended use and performance characteristics of the pyrotechnic device.