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HS Code 8421 encompasses centrifuges, including centrifugal dryers, and filtering or purifying machinery for liquids or gases. The classification includes detailed subcategories for cream separators (8421.11), clothes-drying centrifuges (8421.12), other centrifuges (8421.19), liquid filters for internal combustion engines (8421.23), other liquid filtering machinery (8421.21-8421.29), intake air filters for engines (8421.31), other gas filtering machinery (8421.32-8421.39), and parts (8421.91-8421.99). This separation technology category includes equipment utilizing centrifugal force or porous media to separate materials. Products range from simple automotive oil filters to sophisticated ultracentrifuges for scientific research. Technical specifications focus on separation efficiency, throughput capacity, material compatibility, and operational reliability. Applications span virtually all industrial and scientific sectors, from basic water purification to complex biochemical separations. This division represents critical process equipment enabling the purification, clarification, and separation of materials in liquid or gaseous states, supporting environmental protection, product refinement, and analytical capabilities across numerous industries.