Coconut shell charcoal falls under 440220 (shell or nut charcoal), not the general wood charcoal subheading. The distinction matters because the subheadings carry different duty rates and the raw material identity must be declared accurately.

Heading 4402 covers charcoal in its basic form before activation. Once charcoal has been activated — processed to increase its porosity and surface area for filtration or adsorption use — it is classified as activated carbon in a different chapter. Importers should confirm the degree of processing before classifying a shipment here.