DOT/ ATF Product Classification
§ 555.11 Meaning of terms. https://regulations.atf.gov/555-11/2019-24570#555-11-p413197019-b
Articles pyrotechnic. Pyrotechnic devices for professional use similar to consumer fireworks in chemical composition and construction but not intended for consumer use. Such articles meeting the weight limits for consumer fireworks but not labeled as such and classified by U.S. Department of Transportation regulations in 172.101, Link opens in a new window">49 CFR 172.101 as UN0431 or UN0432.
§ 555.141 Exemptions. https://atf-eregs.18f.gov/555-141/2019-24570
a. General. Except for the provisions of §§ 555.180 and 555.181, this part does not apply to: 7.The importation, distribution, and storage of fireworks classified as UN0336, UN0337, UN0431, or UN0432 explosives by the U.S. Department of Transportation at 172.101, Link opens in a new window">49 CFR 172.101 and generally known as “consumer fireworks” or “articles pyrotechnic.”