Paperboard Regulatory Verification and Customs Exposure Limits
Paperboard import compliance depends on linking physical lot numbers directly to accredited chemical assays and verified chain of custody certificates.
HS Heading 4810
Tariff Classification
International customs tariff nomenclature establishes customs duty categories for paper and paperboard coated on one or both sides with kaolin or other inorganic substances, with or without a binder. Within the global Harmonized System, hs heading 4810 classifies mineral-coated graphic papers, folding boxboard, solid bleached sulphate board, and coated kraftliner provided no other functional coating is present. The heading requires that the mineral coating be applied uniformly to impart printability, gloss, smoothness, or opacity.
It governs reels, rolls, and rectangular sheets with dimensions exceeding standard office paper sizes. The classification excludes paperboard coated with organic polymers, bitumen, wax, or silicone, which fall under separate headings.
Technical Criteria
Customs classification requires laboratory determination of coating composition, basis weight, and mechanical fiber content. Under hs heading 4810, coatings must consist predominantly of inorganic mineral pigments such as calcium carbonate, kaolin clay, titanium dioxide, or talc bound with synthetic latex or starch. Sub-headings distinguish between woodfree papers containing less than ten percent mechanical fibers and mechanical paper grades containing higher wood-pulp fractions.
Standard coated art papers, light-weight coated publication grades, and white-lined chipboards fall into distinct six-digit sub-classifications based on grammage, brightness, and fiber origin. Applying plastic extrusion layers or dispersion barrier varnishes disqualifies the substrate from this heading. Customs authorities use ash content testing, microscopic cross-section analysis, and infrared spectroscopy to verify mineral pigment purity.
Commercial Application
Sourcing managers and customs brokers select tariff codes to establish import duty liability, calculate value-added taxes, and verify trade remedy exemptions. Paperboard shipments cleared under hs heading 4810 must match commercial invoice descriptions, mill specification sheets, and physical reel labels precisely. Misclassification risks retroactive tariff assessments, customs penalties, and cargo border holds.
Mill declarations must confirm the inorganic nature of all surface coatings to ensure smooth customs clearance across international borders.