TCA - HS 2905

CTSH: All non-originating materials used in the production of the good have undergone a change in tariff classification at the 6-digit level (subheading).

A chemical reaction, purification, mixing and blending, production of standard materials, a change in particle size, isomer separation, or biotechnological processing is undergone.

CTH: All non-originating materials used in the production of the good have undergone a change in tariff classification at the 4-digit level (tariff heading) except from non-originating materials of heading 1702 and subheading 382460.

CTSH, however, non-originating materials of the same subheading as the product may be used, provided that their total value does not exceed 20% of the ex-works price of the product.