HS Code for Wood pulp lye

Wood pulp lye is classified under HS code 3804.00 because it represents the residual liquid byproduct generated during the chemical manufacture of wood pulp. This classification is specifically designed for lyes that remain after the extraction of cellulose fibers from wood through various pulping processes, such as the sulfite or sulfate (kraft) methods. The code covers these residues regardless of whether they have been concentrated, desugared, or subjected to further chemical treatments. A primary component often found in these lyes is lignin sulphonates, which are explicitly included under this heading. The Harmonized System treats these substances as industrial chemical residues rather than primary wood products or pure inorganic chemicals. The classification ensures that complex mixtures of dissolved lignin, hemicellulose, and spent pulping chemicals are grouped together for international trade monitoring and tariff application.

Products Included

• Spent sulfite liquor
• Black liquor from the kraft process
• Lignin sulphonates in liquid or powder form
• Concentrated wood lye residues
• Chemically treated residual lyes from pulping

Common Misclassification

Wood pulp lye is frequently confused with tall oil, which is classified under HS code 3803.00. While both are byproducts of the pulping industry, tall oil is a resinous liquid consisting of fatty acids and rosin acids, whereas 3804.00 is reserved for the aqueous residual lyes. Additionally, importers may mistakenly look toward HS code 2815.11 for sodium hydroxide (caustic soda). While caustic soda is a component used in the pulping process, the residual lye is a complex mixture and must be classified under 3804.00 rather than as a pure chemical.

FAQ

What is the HS code for wood pulp lye?

The HS code for wood pulp lye, including residual lyes from wood pulp manufacture and lignin sulphonates, is 3804.00.

Are lignin sulphonates classified differently if they are dried?

No, lignin sulphonates remain under HS code 3804.00 whether they are in a concentrated liquid form or have been dried into a powder.