Centrifuges (Excluding Clothes-Dryers), NESOI

Both solid-liquid and liquid-liquid separation centrifuges for pharmaceutical use classify under 8421190000, as the heading covers centrifuges NESOI regardless of the phase separation involved. What matters is that the machine operates by centrifugal force and is not a cream separator (842111) or a clothes-dryer (842112). Documentation of the machine's operating principle and intended pharmaceutical application supports correct classification and may be relevant to any end-use certificate requirements.

Centrifuges separate components by applying centrifugal force — the machine spins to create density-driven separation. Filtering and purifying apparatus (heading 8421, subheadings 842121 onward) use a physical barrier or medium to remove particles or impurities. A machine that primarily uses a filter medium classifies as filtering apparatus even if it incorporates some rotational motion; one that relies principally on centrifugal force classifies as a centrifuge. Technical specifications and the manufacturer's description of the separation mechanism are key evidence.