HS Code 48.12 – Filter blocks, slabs and plates of paper pulp

HS code 4812 is a 4-digit heading in the Harmonized System that covers: Filter blocks, slabs and plates of paper pulp. Heading 4812 specifically covers filter blocks, slabs, and plates made from paper pulp. This classification is distinct and precise, focusing on finished filtration media rather than general paper sheets. These products are manufactured by compressing or forming paper pulp into rigid, porous structures designed for mechanical separation and clarification in various industrial, food, beverage, and pharmaceutical processes. The scope is narrow, encompassing only these specific forms of paper pulp filters, distinguishing them from other types of paper-based filters (like filter paper in rolls, 4823) or complete filtration machinery (Chapter 84). For trade compliance, accurate classification under 4812 is crucial for ensuring correct duty assessment, especially as these are often specialized industrial inputs. The purity and performance standards for these filters can be very high, particularly in sensitive applications like food and beverage production or pharmaceuticals, making their classification important for regulatory adherence. This heading underscores the transformation of basic paper pulp into highly functional, specialized components, highlighting a niche but significant application of cellulose fibers within Chapter 48.

Beer filter blocks, wine filter slabs, pharmaceutical filter plates, edible oil filter blocks, chemical process filter sheets, laboratory filter blocks, industrial effluent filter media, juice clarification filter plates, water purification filter elements, sugar syrup filter blocks, spirit clarification filter slabs, bio-fuel filter plates, enzyme filtration blocks, solvent purification filter plates, medical fluid filter slabs, waste oil filter blocks, coolant filter plates, paint filtration blocks, varnish filter slabs, resin filter plates, food-grade filter blocks, sterile filter plates.

Misclassification often arises from confusing these specialized pulp filters with other filter media. Traders might mistakenly classify them as general filter paper in rolls (4823) if they overlook the specific 'blocks, slabs, and plates' form. Another common error is classifying them as parts of filtration machinery (Chapter 84) or even as textile filters (Chapter 59) or ceramic filters (Chapter 69) if the material composition isn't carefully verified. The key is the material (paper pulp) and the specific, pre-formed shapes designed for direct insertion into filtration systems, rather than being a raw material or a complete machine part with a casing.

In 2025, the top exporters of HS code 4812 in UN Comtrade data were Germany ($91M, 36% of world exports), Denmark ($32M) and Thailand ($23M). World exports came to about $250M, 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 4812 in UN Comtrade data were the United States ($25M, 11% of world imports), China ($14M) and Germany ($13M). World imports came to about $219M, 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 4812 is a 4-digit heading under Chapter 48 of the Harmonized System. The first 2 digits (48) identify the chapter, and digits 3-4 (12) specify the heading. This code contains multiple 6-digit subheadings for precise product classification.