Hydrochloric acid (CAS 7647-01-0; hydrogen chloride in aqueous solution) moves through global supply chains as a corrosive liquid governed by UN 1789, Class 8, Packing Group II or III depending on hydrogen chloride mass fraction. Typical applications include steel pickling, cation-exchange resin regeneration, industrial pH reduction and deep-well acidizing. Dangerous goods documents for HCl: what each destination requires is not resolved by a single template; the controlling document set is determined by transport mode, destination jurisdiction, packing group and whether the material is commercial product or waste. A 31.5 wt% solution moving in a 20 m³ ISO tank from a Gulf Coast terminal to Rotterdam under the IMDG Code demands a signed dangerous goods declaration and a container/vehicle packing certificate, while the same solution moving by road from Ludwigshafen to Milan under ADR is accompanied by a transport document and the multilingual instructions in writing required by ADR 5.4.3. Destination authorities therefore validate the consignment against concentration-specific classification, packaging, marking and carrier acceptance data.

What Does the IMDG Code Demand for an HCl Consignment Moving by Sea?

The International Maritime Dangerous Goods Code requires a shipper-signed dangerous goods declaration under IMDG 5.4.1.5, which must state UN 1789, HYDROCHLORIC ACID, Class 8, packing group, number and type of packages, total quantity and the ship or container identity. The declaration is coupled with the container/vehicle packing certificate specified in IMDG 5.4.2, signed by the entity responsible for packing the cargo transport unit. The Code assigns emergency schedules F-A, S-B and the Class 8 corrosive label. Segregation inside the container must be validated against compatibility requirements for acids; packages containing HCl must not be packed with alkalis, cyanides or sulfides. For a full container load of 1 000 L IBCs, the packing certificate becomes the primary evidence that block stowage, bracing and leak containment were completed under the IMO/ILO/UNECE CTU Code. Without the declaration and packing certificate, the carrier cannot produce a compliant dangerous goods manifest, and destination terminals in Rotterdam or Singapore may refuse gate-in of the unit.

For road carriage across European ADR contracting states, the transport document specified in ADR 5.4.1.1 must contain UN 1789, HYDROCHLORIC ACID, Class 8, Packing Group II/III, the number and description of packages, total quantity by mass or volume, name and address of shipper and consignee, and the tunnel restriction code. UN 1789 is assigned tunnel restriction code E under ADR 8.6, and the document must reflect the code before the vehicle transits road tunnels. ADR does not recognise a separate dangerous goods declaration; the transport document is the controlling document and must be issued by the consignor. When the consignment exceeds the small load thresholds in ADR 1.1.3.6, the driver must carry the instructions in writing required by ADR 5.4.3. For a PG II load above 333 L/333 kg or a PG III load above 1 000 L/1 000 kg, those instructions must be available in a language understood by the driver and must be produced on request.

Multimodal shipments from a non-EU origin to an EU destination typically present both an IMDG or IATA document and an ADR transport document for the final road leg. Destination consignees often retain these documents for inspection under the ADR 1.8.3 control framework; discrepancies in proper shipping name or packing group are treated as classification nonconformities. German and Dutch border authorities may cross-check the transport document against the safety data sheet, but the SDS itself is not a transport document.

Container Packing Certificate Submission and CTU Code Compliance

The CTU packing certificate is not a generic loading checklist. Under the IMO/ILO/UNECE Code of Practice for Packing of Cargo Transport Units (MSC.1/Circ.1624), the signatory must record that the container was clean and free of incompatible residues, packages were inspected for leakage, bracing and blocking prevented movement, and segregation against incompatible Class 8 acids was maintained. For a mixed load of UN 1789 and sodium hydroxide, physical separation or a solid barrier is required, and the container door must display the correct Class 8 corrosive hazard label and UN 1789 placard. On a 20 ft dry container holding 1 000 L poly-composite IBCs, the packing certificate commonly includes load distribution, barrier placement and spill containment capacity notes. Terminals in Singapore and Antwerp reject units when the packing certificate is unsigned or when the seal number recorded on the document does not match the gate-in seal.

When Destination Modes Force Cargo Aircraft Only Handling for UN 1789

Air carriage under the IATA Dangerous Goods Regulations requires the Shipper’s Declaration for Dangerous Goods (IATA DGR 8.1.2) to be completed in English, signed by a trained dangerous goods professional and attached to the air waybill. The declaration must display UN 1789, HYDROCHLORIC ACID, Class 8, Packing Group II/III, number of packages, net quantity per package and the limitation indicating whether the material is authorised for passenger aircraft or cargo aircraft only. Hydrochloric acid assigned to PG II is normally restricted to cargo aircraft under IATA Packing Instruction 852; PG III may be permitted under IATA Packing Instruction 853 within inner packaging and outer package quantity limits. Because shipper’s declarations are subject to IATA 8.2.6 cargo acceptance checks, incomplete declarations are a frequent cause of overpack rejection at air freight hubs. Destination airports such as Singapore and Hong Kong require the same declaration data to be transmitted in electronic advance cargo manifests before flight arrival.

U.S. Ground and the Fixed 49 CFR Basic Description Sequence

The basic description sequence is mandated under 49 CFR 172.202: UN 1789, Hydrochloric acid solution, Class 8, Packing Group II/III, followed by total quantity and package count. The emergency response telephone number required by 49 CFR 172.604 must be monitored continuously while the hazardous material is in transportation; the U.S. Emergency Response Guidebook assigns guide 157 to UN 1789. For a road shipment of a 31.5 wt% solution in a DOT-specification cargo tank, the shipping paper must also include the tank designation, the volume loaded and the carrier name. The destination may impose additional state or municipal documentation obligations, but the federal hazardous materials shipping paper remains the base document for roadside checks. If the hydrochloric acid is a waste, the U.S. Environmental Protection Agency hazardous waste manifest (EPA Form 8700-22) replaces or supplements the shipping paper under 40 CFR 262.20.

Canadian ground shipments under the Transportation of Dangerous Goods Regulations require a shipping document containing the basic description in the sequence UN 1789, HYDROCHLORIC ACID, Class 8, Packing Group II/III, quantity in kilograms or litres, consignor, consignee and date. Australian movement under the ADG Code requires equivalent information in Part 10 of the code, with the prime contractor and consignor both accountable for document accuracy. In China, the dangerous goods transport document is checked against the GB/T 16483 safety data sheet format and GB 15258-2009 label requirements, but those instruments are not substitutes for the transport declaration required by the mode-specific regulation. Japan and South Korea accept the IATA or IMDG declaration, but customs authorities may require an SDS prepared under Japanese JIS Z 7253 or the Korean Occupational Safety and Health Act before release. Each destination therefore layers customs, environmental and chemical-safety document checks on top of the transport dangerous goods declaration.

SDS, REACH and Destination Import Clearance Are Not Transport Declarations

The safety data sheet required under EU REACH Article 31 and Annex II is evidence of hazard communication, not a dangerous goods transport document. However, carriers and destination agents routinely request a current SDS as part of the acceptance package because it confirms hydrogen chloride concentration, density and corrosion hazard classification for the batch. For EU destinations, an extended SDS with exposure scenarios may be required when the substance is registered at or above 10 t/a under REACH; hydrochloric acid is registered for major industrial uses, and the exposure scenario annexes address pickling, water treatment and industrial pH adjustment. In the United States, the Hazard Communication Standard (29 CFR 1910.1200) mandates SDS format in the current revision, while GHS classification of HCl as Skin Corrosion 1B and STOT SE 3 influences Section 2. The destination may require translations, but the SDS does not replace the shipping paper, DGD or Shipper’s Declaration.

The document set for aqueous hydrochloric acid differs sharply from that of anhydrous hydrogen chloride (UN 1050, Class 2.3/8); a destination that accepts a UN 1789 declaration will reject the same wording if the material is gaseous hydrogen chloride. Published data for the exact concentration cut-off applied by some national competent authorities is limited, so the shipper must validate the packing group against the current regulation of the destination state before document generation.