HS Code 44.05 – Wood wool; wood flour

HS code 4405 is a 4-digit heading in the Harmonized System that covers: Wood wool; wood flour. Heading 4405 is very specific, covering 'Wood wool' and 'Wood flour.' Wood wool, also known as excelsior, consists of fine, curled strands of wood, typically used for packaging, insulation, animal bedding, or evaporative cooling pads. It's produced by shaving thin ribbons from logs. Wood flour, on the other hand, is a very fine powder obtained by grinding wood, often used as a filler in plastics (e.g., wood-plastic composites), linoleum, adhesives, or as an abrasive. Both products represent highly processed forms of wood, but in a comminuted state, rather than solid timber. The scope is limited to these two distinct forms, emphasizing their fine particle or strand nature. This classification is vital for industries requiring these materials as inputs, impacting duty rates, safety regulations (e.g., dust control, flammability), and environmental considerations for sourcing and disposal. These products are a testament to the versatility of wood processing within Chapter 44, transforming timber into specialized industrial raw materials that bear little resemblance to their original log form, yet retain the fundamental properties of wood.

Pine wood wool for packaging, spruce wood wool for evaporative coolers, cedar wood wool for animal bedding, decorative wood wool for gift baskets, shock-absorbing wood wool for fragile items, hardwood wood flour for wood-plastic composites, softwood wood flour for linoleum, wood flour for thermosetting plastics, wood flour as filler in glues, fine wood flour for sanding media, wood flour for cleaning compounds, wood flour for fire starters, wood flour for pet litter, wood flour for explosive manufacturing, wood flour for soil amendments, wood flour for briquette production, wood flour for composite decking, wood flour for acoustic panels, wood flour for modeling clay, wood flour for absorbents.

Misclassification under 4405 can occur if the wood particles are not fine enough to be considered 'flour' or in distinct 'wool' strands. For instance, coarse sawdust or wood chips would typically fall under 4401 (Fuel wood; wood in chips or particles). The distinction is based on the specific processing and resultant particle size/shape. Sawdust, though fine, is generally a byproduct of sawing, whereas wood flour is purposefully ground to a very fine, consistent powder. Wood shavings, if not in the 'wool' form, might also be confused, but 4405 specifically requires the distinct 'wool' structure.

In 2025, the top exporters of HS code 4405 in UN Comtrade data were Germany ($33M, 39% of world exports), Vietnam (about $14M) and Ukraine (about $7.7M). World exports came to about $85M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.

In 2025, the top importers of HS code 4405 in UN Comtrade data were the Netherlands ($11M, 12% of world imports), Germany ($9.0M) and South Korea ($8.7M). World imports came to about $93M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.

HS code 4405 is a 4-digit heading under Chapter 44 of the Harmonized System. The first 2 digits (44) identify the chapter, and digits 3-4 (05) specify the heading. This code contains multiple 6-digit subheadings for precise product classification.