The document-control phrase “IMDG, ADR and IATA for Sulfuric Acid: The Documents You Actually Need” is best understood as a mode-specific matrix rather than a single universal form. Sulfuric acid is assigned under all three codes by dangerous goods list entries, and the correct entry changes with concentration and physical condition. Concentrated material above 51% acid by mass is UN1830, SULPHURIC ACID, Class 8, Packing Group II. Material at or below 51% acid falls under UN2796, SULPHURIC ACID, with not more than 51% acid or BATTERY FLUID, ACID. Spent material is UN1832, SULPHURIC ACID, SPENT. Fuming sulfuric acid, or oleum, is UN1831, SULPHURIC ACID, FUMING, Class 8, subsidiary hazard 6.1, Packing Group I. A consignment note that states only “sulfuric acid” without the legal proper shipping name and UN number is routinely rejected at the terminal gate.

The concentration threshold of 51% by mass is the first documentation fault line. A road tanker carrying virgin acid at 96 wt% is UN1830; the same tanker after a spent-acid recovery run may become UN1832 even though the Class 8 hazard label remains. The shift changes the proper shipping name, the waste-control paperwork and, in some cross-border movements, the customs tariff justification. CAS 7664-93-9 and EC 231-639-5 are supporting identifiers; they do not replace the assigned proper shipping name. Field audits at chemical loading racks frequently find that enterprise resource planning systems pre-populate UN1830 for all sulfuric acid products, producing a documentation-to-sample mismatch on dilute battery-fluid returns or spent-acid loads. The loading operator must compare the certificate of analysis with the dangerous goods list before signing the transport document.

What must appear on the ADR transport document before the tanker moves?

Under ADR, the minimum legal document is the dangerous goods transport document described in ADR 5.4.1. The information sequence is not optional in enforcement practice. The document must show the UN number preceded by “UN”; the proper shipping name exactly as assigned in ADR Table A; Class 8; Packing Group II; the number and description of packages; and the total quantity. For UN1830, ADR Table A assigns classification code C1, hazard identification number 80, tunnel restriction code E, transport category 2, limited quantity 1 L, excepted quantity E2, packing instruction P001, IBC instruction IBC03, portable tank instruction T8, and tank code L4BN. Use of “battery acid” in place of the proper shipping name is acceptable only when the consignment is actually classified as UN2796 and the official proper shipping name includes that term.

ADR 1.1.3.6 provides small-load relief. For transport category 2 materials, the threshold is 333 L per transport unit. Below this value, certain ADR provisions, including orange-plate display and some vehicle equipment items, are reduced. The threshold is calculated on the total quantity of all dangerous goods in the transport unit, not solely the sulfuric acid volume. A vehicle moving 300 L of UN1830 in four 60 L drums may fall under the small-load exemption, but the ordinary consignment note must still identify the goods. Above 333 L, the full document set and vehicle equipment requirements apply.

The instructions in writing required by ADR 5.4.3.4 must be carried in the vehicle cab and must be comprehensible to the driver. The driver must hold the ADR vocational training certificate required under ADR 8.2.2 when the load exceeds exemption thresholds. For tank carriage, the vehicle approval certificate under ADR 9.1.2 must match the tank code; a tanker approved for L4BN cannot be documented with a different tank code without an approval amendment. The orange plate hazard identification number 80 is the visible field check that the document classification and the vehicle marking align.

IMDG document control aboard container vessels

Under the IMDG Code, the primary document is the dangerous goods declaration required by IMDG 5.4.1. It is not a continuation page of the ADR consignment note. The declaration must contain the proper shipping name, UN number, Class 8, Packing Group II, number and kind of packages, and total quantity. For UN1830, the emergency schedule is F-A, S-B. Sulfuric acid is assigned to segregation group SGG1, acids, and the declaration must support the vessel stowage plan with segregation from alkalis, cyanides and other incompatible classes. Sulfuric acid is not listed in the IMDG Code as a marine pollutant; however, the low-pH hazard still drives stowage and segregation requirements.

A separate container/vehicle packing certificate is required under IMDG 5.4.2 when sulfuric acid is packed into a cargo transport unit. The certificate must be signed by the party responsible for packing, not automatically by the freight forwarder or shipping line. It identifies the container number, confirms that the packages were inspected for damage, that the declaration matches the package marks, and that the cargo transport unit was packed in accordance with the IMO/ILO/UNECE CTU Code. For an IBC03 intermediate bulk container in a 20-foot container, inspectors cross-check the IBC test and inspection date against the document; an expired IBC periodic inspection is a packing-certificate failure even when the IBC appears externally sound.

Port terminals also use the declaration to screen the container dangerous goods profile. For sulfuric acid, the terminal typically verifies the presence of the SGG1 acid segregation code, the F-A, S-B EmS assignment, and the absence of conflicting cargo such as potassium cyanide or sodium hypochlorite. The declaration should not contain the phrase “acid residue” without classification; empty uncleaned packages follow the same Class 8 entry until cleaned or rendered free of residue.

When air cargo limitations force a CAO-only declaration

Air transport of sulfuric acid is controlled by the IATA Dangerous Goods Regulations and requires a Shipper’s Declaration for Dangerous Goods separate from the ADR transport document and the IMDG dangerous goods declaration. The declaration must be completed in English, signed by the shipper, and include a 24-hour emergency contact number that is monitored while the consignment is in transit. The entry UN1830 is Class 8, Packing Group II, and falls under Packing Instruction 851 for air transport. Passenger aircraft allow a maximum net quantity per package of 1 L; cargo aircraft only allow a maximum of 30 L per package. The air waybill must cross-reference the same information, and a mismatch between the Shipper’s Declaration and the air waybill is treated as an undeclared dangerous goods event.

For UN1831 fuming sulfuric acid, the subsidiary risk 6.1 and Packing Group I trigger stricter controls; operators often impose a CAO-only or forbidden status. The shipper must verify the current IATA DGR edition and any state or operator variation before tender. Sulfuric acid packed under a surface-mode quantity cannot simply be placed on a passenger aircraft because the air package limit is 1 L for passenger carriage. A 20 L drum is acceptable only under the cargo-aircraft-only limit, and the declaration and package marking must both state “Cargo Aircraft Only.”

The operating rule is cross-check, not copy-forward. A consignor moving a single lot of 98 wt% sulfuric acid by truck to a port, then by container vessel, and then by air at destination must generate an ADR transport document, an IMDG dangerous goods declaration and packing certificate, and an IATA Shipper’s Declaration. The same physical material changes document fields because each mode has independent packaging and quantity ceilings. The ADR document may list a 1,000 L IBC; the IMDG declaration must add the container packing certificate; the IATA declaration will require re-packing into smaller specification packagings and may require a CAO-only entry. The concentration threshold of 51% is re-checked at each mode because the proper shipping name may shift from UN1830 to UN2796 if the material is diluted. Failure to align the three document sets to the correct UN entry remains the highest-frequency enforcement issue in sulfuric acid transport.