19 C.F.R. § 10.740
An indirect material, as defined in § 10.729(h) of this subpart, will be considered to be an originating material without regard to where it is produced, and its value will be the cost registered in the accounting records of the producer of the good.
Example. Australian Producer C produces good C using non-originating material A. Producer C imports non-originating rubber gloves for use by workers in the production of good C. Good C is subject to a tariff shift requirement. As provided in § 10.730(b)(1) of this subpart and General Note 28(n), each of the non-originating materials in good C must undergo the specified change in tariff classification in order for good C to be considered originating. Although non-originating material A must undergo the applicable tariff shift in order for good C to be considered originating, the rubber gloves do not because they are indirect materials and are considered originating without regard to where they are produced.
19 C.F.R. §10.740