Wool Classification
Animal hair trade requires strict adherence to specific numbering protocols because international customs authorities collect tariffs based on exact species and processing stages. Harmonized System Chapter 51 groups all hair fibres and yarns together, separating fine animal hair from coarse variants before any fabric construction begins. Commercial buyers use this numerical division to determine duty rates at the border based on whether greasy, carded, or combed stock enters the warehouse.
Border Valuation
Tariff schedules apply specific percentages depending on preparation level, so raw fleece incurs different financial penalties than cleaned top or spun yarn. Customs agents inspect import documents for Harmonized System Chapter 51 codes to verify that greasy alpaca or cashmere shipments match declared weights. Commercial invoicers calculate landed costs by combining base material prices with the exact duties assigned to each subcategory within the schedule.
Processing Boundaries
Manufacturing facilities must separate fine hair from sheep wool during initial sorting to satisfy regulatory descriptions before spinning mills receive the raw stock. Harmonized System Chapter 51 defines the exact line where animal hair transitions from raw agricultural output to industrial textile input. Technical inspectors check fibre diameters under microscopes to ensure that cashmere or mohair shipments meet the micron thresholds required for luxury apparel production.
Laboratory Verification
Testing laboratories measure diameter distributions to confirm that fine hair shipments qualify for preferential duty rates under international trade agreements. Harmonized System Chapter 51 provides the legal framework that stops mislabeled coarse hair from entering luxury finished goods supply chains. Regulatory compliance depends entirely on laboratory certificates that verify species composition before commercial contracts settle.
