Skim milk powder and other low-fat milk solids with not more than 1.5% fat content classify under 040210, while milk and cream powders with over 1.5% fat — including whole milk powder — fall under 040221 (unsweetened) or 040229 (sweetened). Fat content must be verified by laboratory analysis, and the certificate of analysis from the foreign manufacturer is typically required to support the declared subheading.

Yes, several subheadings within 0402 are subject to TRQ treatment. In-quota quantities enter at lower duty rates, while over-quota shipments face substantially higher rates. Quota administration is handled by USTR, and importers must hold valid licenses to claim in-quota rates. Given that quota fill can be rapid for popular products like skim milk powder, importers should monitor quota status closely and plan procurement accordingly.