Tariff Rule
Commodity categorization determines the applicable duty rate based on the single fibre type that contributes the highest weight to a blended fabric. In chief weight customs classification, the absolute weight of each fibre component is measured in a laboratory to establish which one exceeds fifty percent of the total mass. This determines the harmonized system tariff code for the imported garment.
The classification governs the final duty paid at the border.
Fibre Measurement
Laboratory analysis determines the percentage of each fibre in a blended yarn through chemical dissolution. The technician weighs the sample, dissolves one component, and then weighs the remaining fibre to calculate the proportions. If the results are close to fifty percent, the test must be repeated to ensure accuracy.
This is because a difference of one percent can change the tariff category.
Duty Deviation
Global supply chains depend on precise fibre ratios to avoid unexpected import costs. A garment classified under cotton chief weight might carry a lower duty than one classified under synthetic chief weight. This is why garment factories must monitor yarn compositions closely during production.
A mill that alters the blend ratio can cause an import penalty that wipes out the profit margin of the entire shipment.
Compliance Verification
Custom authorities test incoming garments to verify the declarations on the commercial invoice. If the chemical test reveals that the declared chief weight customs classification is incorrect, the shipment is detained. This forces brands to maintain strict quality control records.
