8421 - Centrifuges, including centrifugal dryers; filtering or purifying machinery and apparatus, for liquids or gases; parts thereof:
Sub-classifications
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8421 1100 00
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8421 1200 00
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Overview
HTS heading 8421 encompasses a broad range of machinery and apparatus primarily designed for separation and purification processes. This includes centrifuges, which utilize centrifugal force to separate components of varying densities, commonly found in laboratory, industrial, and even laundry applications (e.g., spin dryers). The heading also covers a wide array of filtering and purifying machinery and apparatus specifically for liquids and gases, such as water purification systems, air filters, oil filters, and industrial dust collectors.
This category is distinct from other headings within Section XVI, which focus on different types of machinery. For instance, heading 8419 covers machinery for treating materials by a process involving a change of temperature, while 8422 deals with dishwashing machines and machinery for packing or wrapping. Heading 8421's core function is separation and purification, distinguishing it from machinery used for heating, cooling, mixing, or packaging.
Within heading 8421, further subdivisions exist to provide more granular classification. These include specific categories for centrifuges, filtering or purifying apparatus for liquids, filtering or purifying apparatus for gases, and parts thereof. This hierarchical structure allows for precise identification based on the intended use and the medium being processed, ensuring accurate tariff application for a diverse set of industrial and commercial equipment.