Cellulose Sealing Washers for HVAC Ductwork
Die-cut cellulose fiber washers sealing joints in heating, ventilation, and air conditioning duct assemblies. These paper-based seals under HTS 4823.90.8000 provide airtight barriers without chemical adhesives.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If plastic tube/flange fittings with seals
Flexible plastic tubes with attached seals classified by plastic component.
If tracing or drawing paper cut to shape
Specialty papers cut for non-sealing functions have separate subheadings.
If articles of plaster with embedded paper
Composite construction boards with sealing functions go to Chapter 68.
Not sure which classification is right?
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Import Tips & Compliance
• Include airflow test data showing sealing performance for customs verification
• Package as finished seals, not raw material to avoid 48xx paper classifications
Related Products under HTS 4823.90.80.00
Sulfite Process Paper Gaskets for Food Processing
Machine-glazed sulfite wrapping paper gaskets (per 4805.30 specs) for food processing valves and pumps. Low ash content and burst index qualify as seals under HTS 4823.90.8000.
Paper Gaskets for Automotive Oil Pans
Die-cut gaskets made from compressed paperboard or cellulose fiber material, designed to seal automotive oil pans and prevent leaks. These fall under HTS 4823.90.8000 as they are paper-based seals cut to specific shapes for industrial sealing applications, distinct from rubber or metal gaskets.
Cellulose Fiber Washers for Plumbing Fixtures
Washers cut from cellulose wadding or fiber webs, used in plumbing assemblies to create watertight seals around faucets and valves. Classified under HTS 4823.90.8000 as shaped cellulose fiber articles functioning as seals, separate from plastic or metal washers.
Paperboard Gaskets for Electrical Junction Boxes
Precision-cut paperboard gaskets providing dust and moisture seals for electrical enclosures and junction boxes. These qualify for HTS 4823.90.8000 as other paperboard seals cut to size/shape, valued for their compressibility and non-conductive properties.
Compressed Paper Washers for Hydraulic Systems
High-density compressed paper washers used in hydraulic cylinders and valves for pressure sealing. HTS 4823.90.8000 covers these as paper pulp-based seals cut to precise dimensions, offering cost-effective alternatives to synthetics.
Paper Pulp Gaskets for Industrial Pumps
Molded paper pulp gaskets custom-cut for industrial pump housings, resistant to oils and moderate pressures. Classified in HTS 4823.90.8000 as other paper pulp articles specifically shaped as seals.