Chapter 8484 — Customs Tariff Headings

Automotive Head Gasket

A multi-layer steel head gasket with elastomeric coatings, designed to seal the cylinder head to the engine block in internal combustion engines. Its construction from two or more layers of metal sheeting combined with non-metallic material qualifies it under tariff item 8484.10.00.

Boiler Flange Composite Gasket

A Kammprofile gasket with a grooved steel core and soft iron facing, used for high-pressure steam boiler flanges. The two-layer metal sheeting with an integrated sealing overlay places it under tariff item 8484.10.00.

Crystal Puller Chamber Gasket

A high-vacuum multi-layer gasket made of stainless steel with silver plating, used in Czochralski crystal puller chambers for wafer manufacturing. Its layered metal construction combined with vacuum sealing materials falls under tariff item 8484.10.00.

Cylinder Head Gasket for Diesel Engines

A three-layer steel gasket with wire bead reinforcement, designed for heavy-duty diesel engines. The multi-layer steel (MLS) construction with two or more layers of metal sheeting qualifies it under tariff item 8484.10.00.

Exhaust Flange Repair Gasket Kit

An assortment kit of multi-layer steel exhaust gaskets in varying thicknesses, packaged in retail pouches. As a set of gaskets of dissimilar composition, it falls under tariff item 8484.10.00.

Exhaust Manifold Gasket Set

A set of gaskets combining multi-layer steel with graphite facing, used for sealing exhaust manifolds to cylinder heads. The combination of metal sheeting and graphite places it under tariff item 8484.10.00.

Flange Gasket for Industrial Pipes

A spiral-wound gasket made of alternating stainless steel layers and graphite filler, used for high-pressure pipe flanges in chemical plants. Its multi-layer metal sheeting combined with graphite qualifies it under tariff item 8484.10.00.

Heat Exchanger Gasket

A double-jacketed metal gasket with PTFE inner lining, used for plate heat exchangers in HVAC systems. The metal sheeting combined with PTFE places it under tariff item 8484.10.00.

Marine Engine Flange Gasket

A corrosion-resistant multi-layer gasket of copper-nickel sheeting with polymer binder, used for ship engine cooling systems. The metal sheeting combined with polymer qualifies it under tariff item 8484.10.00.

Oil Pan Gasket Composite

A multi-layer steel-reinforced gasket with perimeter bead, used for sealing engine oil pans to the block. The combined metal sheeting and sealing compound layers place it under tariff item 8484.10.00.

Turbocharger Mounting Gasket

A layered stainless steel gasket with mica/graphite facing, used for turbocharger-to-manifold flange sealing. The multi-layer metal sheeting with combined materials for extreme heat places it under tariff item 8484.10.00.

Wafer Grinder Coolant Seal Gasket

A precision multi-layer metal gasket sealing coolant passages in semiconductor wafer grinding machines. Its layered metal sheeting combined for cleanroom-compatible sealing qualifies it under tariff item 8484.10.00.

API 682 Compliant Mechanical Seal

> A pressurized dual mechanical seal designed to meet API 682 standards for refinery pump applications. It ensures emission control in volatile service by providing a robust sealing solution between rotating and stationary faces. This product falls under tariff item 8484.20.00 as a mechanical seal, which is essential for preventing leaks in demanding industrial environments.

Bellows Mechanical Seal

> A bellows mechanical seal using metal or elastomeric bellows to provide axial movement for sealing in agitators and mixers. It uses mechanical faces with bellows for pressure compensation, making it suitable for corrosive environments. This product is classified under tariff item 8484.20.00 as a mechanical seal, which is designed to prevent fluid leakage in rotating equipment.

Cartridge Type Mechanical Seal

> A pre-assembled cartridge mechanical seal that installs as a single unit onto pump shafts, simplifying maintenance in chemical processing equipment. It provides a mechanical sealing action using spring-loaded faces to prevent leaks. This product falls under tariff item 8484.20.00 as a mechanical seal, which is a critical component for pump reliability.

Cryogenic Service Mechanical Seal

> A mechanical seal with perfluoroelastomer seals designed for LNG pump applications at -160°C. It prevents boil-off in cryogenic fluids by maintaining a tight seal under extreme cold conditions. This product is classified under tariff item 8484.20.00 as a mechanical seal, which is essential for cryogenic service.

Crystal Puller Rotary Mechanical Seal

> A rotary mechanical seal for Czochralski crystal puller rotation mechanisms in silicon boule production. It withstands high vacuum and temperature cycles, ensuring a reliable seal in semiconductor manufacturing. This product falls under tariff item 8484.20.00 as a mechanical seal, which is critical for crystal growth equipment.

Double Mechanical Seal Arrangement

> A tandem or back-to-back double mechanical seal with barrier fluid provisions for hazardous fluid handling in petrochemical pumps. It provides redundancy by using dual faces to prevent leaks. This product is classified under tariff item 8484.20.00 as a mechanical seal, which is designed for high-risk applications.

Gallium Arsenide Wafer Polisher Seal

> A mechanical seal for chemical mechanical polishing (CMP) of gallium arsenide compound semiconductor wafers. It uses alkaline slurries for polishing, requiring a seal that resists corrosive chemicals. This product falls under tariff item 8484.20.00 as a mechanical seal, which is essential for wafer preparation equipment.

High Temperature Mechanical Seal

> A mechanical seal with graphite secondary seals for temperatures exceeding 400°C in furnace circulator pumps. It is critical for heat transfer fluid systems, providing a reliable seal under extreme heat. This product is classified under tariff item 8484.20.00 as a mechanical seal, which is designed for high-temperature service.

Pusher Type Mechanical Shaft Seal

> A spring-loaded pusher mechanical seal where sealing faces slide axially along the shaft in water pumps. It is common in HVAC and general water circulation systems, providing a simple and effective sealing solution. This product falls under tariff item 8484.20.00 as a mechanical seal, which is widely used in industrial pumps.

Silicon Wafer Lapper Mechanical Seal

> A mechanical seal for lapping machine platens processing silicon wafers to exact thickness tolerances. It is critical for surface flatness before polishing, ensuring precision in semiconductor manufacturing. This product is classified under tariff item 8484.20.00 as a mechanical seal, which is essential for wafer preparation.

Single Spring Mechanical Face Seal

> A mechanical seal featuring a single spring mechanism to maintain contact between rotating and stationary sealing faces. It is commonly used in industrial pumps, providing a reliable seal for various fluids. This product falls under tariff item 8484.20.00 as a mechanical seal, which is designed for general pump applications.

Split Axial Mechanical Seal

> A clamshell split mechanical seal for in-situ installation on large slurry pumps without shaft removal. It is used in mining and dredging operations, providing a reliable seal in abrasive services. This product is classified under tariff item 8484.20.00 as a mechanical seal, which is designed for heavy-duty applications.

Stationary Seat Mechanical Seal

> A mechanical seal with a stationary seat design where only the rotating face moves, used in high-speed turbines. It reduces wear in continuous duty applications, providing a durable sealing solution. This product falls under tariff item 8484.20.00 as a mechanical seal, which is critical for turbine operations.

Wafer Grinder Spindle Mechanical Seal

> A precision mechanical seal for semiconductor wafer grinder spindles, preventing slurry contamination. It maintains spindle integrity during grinding processes, ensuring high-quality wafer production. This product is classified under tariff item 8484.20.00 as a mechanical seal, which is essential for semiconductor processing.

Wafer Slicing Saw Coolant Mechanical Seal

> A mechanical seal containing diamond slurry coolant in wire saws slicing semiconductor wafers from boules. It ensures precise kerf-less slicing, maintaining the integrity of the cutting process. This product falls under tariff item 8484.20.00 as a mechanical seal, which is critical for wafer preparation equipment.

Automotive Head Gasket Set

A pre-assembled set of gaskets including multi-layer steel head gaskets combined with other materials, designed to seal engine cylinders in passenger cars. This set falls under tariff item 8484.90.00 as a set or assortment of gaskets of dissimilar composition, put up in a pouch or envelope for retail sale.

Compressor Mechanical Face Seal

A mechanical face seal with metal bellows, carbon face, and rubber O-rings, used in air compressors for rotating equipment. This product is classified under tariff item 8484.90.00 as a mechanical seal, being a combination of metal and other materials for sealing applications.

Graphite Composite Flange Gasket

A spiral-wound gasket made of stainless steel sheeting combined with flexible graphite, used for sealing industrial pipeline flanges in oil and gas processing. This gasket falls under tariff item 8484.90.00 as a gasket of metal sheeting combined with other materials.

Heat Exchanger Tube Sheet Gasket Set

An assortment of double-jacketed metal gaskets with filler material, packaged as a set for heat exchanger tube sheets. This product is classified under tariff item 8484.90.00 as a set or assortment of gaskets of dissimilar composition, put up in a pouch or envelope.

Hydraulic Cylinder Multi-Layer Gasket

A multi-layer gasket combining stainless steel sheeting with graphite and rubber, designed for high-pressure hydraulic cylinders in industrial machinery. This gasket falls under tariff item 8484.90.00 as a gasket of metal sheeting combined with other materials, not elsewhere specified.

Industrial Pump Mechanical Seal

A mechanical seal assembly with metal sheeting gaskets combined with rubber and ceramic components, used for sealing rotating shafts in centrifugal pumps. This product is classified under tariff item 8484.90.00 as a mechanical seal, being a combination of metal and other materials for sealing applications.

Marine Engine Exhaust Gasket Assortment

A retail-packaged set of dissimilar gaskets including copper-asbestos and multi-layer steel, designed for marine diesel exhaust manifolds. This product is classified under tariff item 8484.90.00 as an assortment of gaskets put up in envelopes, with metal sheeting combined with other materials.

Oven Door Multi-Layer Gasket

A high-temperature gasket with steel mesh combined with fiberglass and silicone, used for commercial oven doors. This gasket falls under tariff item 8484.90.00 as a gasket of metal sheeting combined with other materials, not elsewhere specified.

Semiconductor Wafer Grinder Gasket Kit

An assortment of precision multi-layer metal gaskets with PTFE coating, packaged in pouches for sealing chambers in wafer grinding machines used in semiconductor fabrication. This product is classified under tariff item 8484.90.00 as a set or assortment of gaskets of dissimilar composition, put up in pouches.