Filtering or purifying machinery and apparatus for gases: — Catalytic converters or particulate filters, whether or not combined, for purifying or filtering exhaust gases from internal combustion engines
N351489 · 2025-07-31 — The tariff classification of catalytic converters from various countries
Descriptive literature was provided for our review. The items under consideration are described as used catalytic converters, which are devices in a vehicle’s exhaust system that reduce harmful emissions from being released into the atmosphere. They work by converting pollutants like carbon monoxide, hydrocarbons, and nitrogen oxides into less harmful substances like carbon dioxide, water, and nitrogen. This conversion is achieved through chemical reactions facilitated by catalytic materials, usually platinum, palladium, and rhodium. The catalytic converters being imported are used and are…
N333853 · 2023-07-18 — The tariff classification and country of origin of a gas particulate filter
The item under consideration is described as a gas particulate filter, which is a device designed for filtering particulates in motor vehicle exhaust flows. The particulate filtering capability is imparted by a precision “plugging” of adjacent channels to direct the gas flow and particulate filtering through the walls of the substrate. This capability occurs when the substrate is plugged and is enhanced by the application of an Accelerated Purification Technology (APT) coating. The base filter is a ceramic composition with inherent properties that make the cell walls porous and permeable to…
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