HS Code 25.09 – Chalk

HS code 2509 is a 4-digit heading in the Harmonized System that covers: Chalk. Heading 2509 specifically covers natural chalk. This classification is for the naturally occurring, relatively soft, porous form of limestone (calcium carbonate). Its scope includes chalk in its crude form, as well as crushed, ground, or powdered forms, provided it remains natural and has not been chemically processed or mixed with binders or other substances to create specific products like prepared writing chalks. The key boundary is 'natural'; manufactured calcium carbonate or precipitated calcium carbonate falls under chemical headings. Chalk's primary uses include agricultural applications as a soil amendment to adjust pH, as a filler and extender in paints, plastics, and rubber, and as a raw material in cement production. For trade compliance, distinguishing natural chalk from other forms of calcium carbonate (e.g., marble, limestone, or manufactured varieties) is crucial to ensure correct tariff application. Historically, chalk has been used for centuries in construction and agriculture. Its trade significance, though often regional due to its bulk and relatively low value, is essential for industries relying on natural mineral fillers and agricultural inputs. As a component of Chapter 25, which deals with natural mineral products, chalk perfectly aligns as a naturally occurring earth or stone, typically traded in bulk.

Natural chalk (lump), crushed natural chalk, powdered natural chalk, agricultural chalk, feed-grade natural chalk, filler-grade natural chalk, pigment-grade natural chalk, natural whiting, cretaceous chalk, cement-grade chalk, natural blackboard chalk (unprepared), marl (chalky earth), ground chalk, unprocessed chalk, bulk chalk, fine chalk powder, micronized natural chalk, chalk for lime production, industrial natural chalk, natural calcium carbonate chalk.

A common mistake is confusing natural chalk (2509) with other forms of calcium carbonate. Precipitated calcium carbonate, a manufactured chemical, belongs to heading 2836. Similarly, prepared chalks for writing or specific industrial uses (e.g., with binders) are typically classified under 3824. General limestone or marble, when crushed or broken, usually falls under 2517 (pebbles, gravel, crushed stone), not 2509, unless it specifically possesses the characteristics of chalk. The 'natural' and 'chalk' specificities are key differentiators.

In 2025, the top exporters of HS code 2509 in UN Comtrade data were France ($30M, 29% of world exports), Germany ($12M) and Jordan (about $8.8M). World exports came to about $103M, 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 2509 in UN Comtrade data were Belgium ($25M, 19% of world imports), Germany ($19M) and the Netherlands ($18M). World imports came to about $137M, 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 2509 is a 4-digit heading under Chapter 25 of the Harmonized System. The first 2 digits (25) identify the chapter, and digits 3-4 (09) specify the heading. This code contains multiple 6-digit subheadings for precise product classification.