46 CFR § 148.280 - Magnesia, unslaked (lightburned magnesia, calcined magnesite, caustic calcined magnesite).

---
identifier: "/us/cfr/t46/s148.280"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "46 CFR § 148.280 - Magnesia, unslaked (lightburned magnesia, calcined magnesite, caustic calcined magnesite)."
title_number: 46
title_name: "Shipping"
section_number: "148.280"
section_name: "Magnesia, unslaked (lightburned magnesia, calcined magnesite, caustic calcined magnesite)."
chapter_name: "COAST GUARD, DEPARTMENT OF HOMELAND SECURITY"
subchapter_number: "N"
subchapter_name: "DANGEROUS CARGOES"
part_number: "148"
part_name: "CARRIAGE OF BULK SOLID MATERIALS THAT REQUIRE SPECIAL HANDLING"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "33 U.S.C. 1602; E.O. 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 277; 46 U.S.C. 3306, 5111; 49 U.S.C. 5103; Department of Homeland Security Delegation No. 0170.1."
regulatory_source: "75 FR 64591, Oct. 19, 2010, unless otherwise noted."
cfr_part: "148"
---


# 148.280 Magnesia, unslaked (lightburned magnesia, calcined magnesite, caustic calcined magnesite).

(a) This part does not apply to the transport of natural magnesite, magnesium carbonate, or magnesia clinkers.

(b) When transported by barge, unslaked magnesia must be carried in an unmanned, all-steel, double-hulled barge equipped with weathertight hatches or covers. The barge may not carry any other cargo while unslaked magnesia is on board.

(c) The shipping paper requirements in § 148.60 of this part and the dangerous cargo manifest requirements in § 148.70 of this part do not apply to unslaked magnesia transported under the requirements of paragraph (b) of this section.