Northern Bleached Softwood Kraft Mechanical Pulp (NBSKMP)
NBSKMP is a high-yield mechanical pulp produced from softwood chips using a combination of mechanical grinding and mild chemical treatment, resulting in fibers with significant lignin content. It is primarily used in newsprint and tissue paper production due to its bulk and opacity. Classified under HTS 4701.00.00.00 as mechanical woodpulp, distinct from chemical pulps which remove most lignin.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If primarily chemical process with sulfate method
Southern bleached kraft chemical pulp falls under 4703 as it has lower lignin from extensive chemical delignification, unlike mechanical pulp.
If dissolving grade with high alpha-cellulose
Chemical woodpulp meeting dissolving grade specs (92%+ insoluble fraction) shifts to 4702, used for rayon/viscose not paper.
If semi-chemical process dominant
Semi-chemical woodpulp uses partial chemical cooking before mechanical refining, classified separately in 4705 from pure mechanical.
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Import Tips & Compliance
• Verify pulp yield (85-98%) and lignin content (>20%) through lab testing to confirm mechanical classification vs. chemical pulp
• Include mill certificates specifying production method (e.g
• refiner mechanical pulping) and wood species for customs compliance
• Avoid misclassification as chemical pulp by ensuring documentation excludes low lignin or high alpha-cellulose specs
Related Products under HTS 4701.00.00.00
Thermomechanical Pulp (TMP) from Spruce
TMP is generated by steaming wood chips at high temperature followed by mechanical defibration in refiners, preserving most lignin for strength and yield. Ideal for magazine paper and board due to its high bulk and print quality. Falls under HTS 4701.00.00.00 as a true mechanical woodpulp without significant chemical dissolution.
Chemi-Thermomechanical Pulp (CTMP) Softwood
CTMP involves mild chemical treatment of chips with sodium sulfite before thermomechanical pulping, yielding brighter pulp with good strength for tissue and linerboard. Though 'chemi-' suggests chemicals, minimal dissolution keeps high yield (>85%), classifying it as mechanical woodpulp under HTS 4701.00.00.00.
Pressure Groundwood Pulp (PGW) from Fir
PGW uses pressure between grinding stones on wood logs, producing pulp with excellent bonding for sack paper and board. The mechanical grinding preserves yield and opacity. As a classic mechanical woodpulp, it is definitively under HTS 4701.00.00.00.
Bleached Mechanical Pulp (BMP) Aspen
BMP from hardwood undergoes mechanical pulping followed by peroxide bleaching for whiteness in hygiene papers without full chemical delignification. Yield remains high (90%+). Still mechanical woodpulp per HTS 4701.00.00.00 as bleaching doesn't change process classification.
High-Temperature Thermomechanical Pulp (HTMP)
HTMP applies higher steaming temperatures (160°C+) before refining for improved fiber separation and energy efficiency in softwood pulp for packaging grades. Mechanical process defines its high yield. Covered by HTS 4701.00.00.00 for all TMP variants.
Medium Density Fiberboard Pulp (MDF Pulp)
Produced via mechanical steam explosion and refining of hardwood for MDF production, this pulp forms uniform fibers. Used as raw material before pressing. Mechanical classification under HTS 4701.00.00.00.