Carbon Fiber Articles for Non-Electrical Uses (NESOI)

For articles of carbon fiber, US Customs and Border Protection applies a 'substantial transformation' test: the country where the fiber undergoes the processing that creates a new and distinct article with a different name, character, and use is generally the country of origin. Simply cutting or laminating fiber in a third country typically does not constitute substantial transformation, but molding or curing a composite structure into a finished part often does. Given the complexity of aerospace supply chains, a binding ruling from CBP is strongly recommended.

Importers should be prepared to provide technical specifications, engineering drawings, or end-use certifications that confirm the article is not designed for electrical or electronic functions. For dual-use components — such as those used in both structural and conductive applications — CBP may request additional evidence of primary function. A product data sheet specifying the application and any relevant industry standards (aerospace, automotive, medical) is generally the most effective supporting document.