UN1830 sulfuric acid table entry.

Where UN1830 sits in the table

The table description is not just "sulfuric acid". The proper shipping name is "Sulfuric acid with more than 51 percent acid". This page covers the UN1830 row only. The ERG 2024 index lists the names Sulfuric acid, Sulfuric acid with more than 51 percent acid, Sulphuric acid, and the sulphuric spelling of the same, all under UN1830 with Guide 137, which is titled Substances - Water-Reactive - Corrosive.

172.101(c)(1) says words may be alternatively spelled as they appear in the ICAO Technical Instructions or the IMDG Code, with "sulfur" and "sulphur" given as the example, so either spelling is an accepted form of the shipping name.

The full row from the eCFR copy of the table, current through October 29, 2026 and read November 2, 2026, is below. Every value is copied from 49 CFR 172.101; the last column is the regulation's own explanation of the column.

The 172.101 row, column by column

How the regulation defines the hazard class

173.136(a) says, abridged: ""corrosive material" (Class 8) means a liquid or solid that causes irreversible damage to human skin at the site of contact within a specified period of time. A liquid, or a solid which may become liquid during transportation, that has a severe corrosion rate on steel or aluminum based on the criteria in 173.137(c)(2) is also a corrosive material."

Special provisions on this entry, in the rule's words

Column 7 does not explain itself; each code is defined in 172.102. These are the definitions as printed in the eCFR text for the codes listed on the row. Where a provision ends with a list of conditions that this page does not reproduce, it says so.

• A3: For combination packagings, if glass inner packagings (including ampoules) are used, they must be packed with absorbent material in tightly closed rigid and leakproof receptacles before packing in outer packagings.
• A7: Steel packagings must be corrosion-resistant or have protection against corrosion.
• B3: MC 300, MC 301, MC 302, MC 303, MC 305, and MC 306 and DOT 406 cargo tanks and DOT 57 portable tanks are not authorized.
• B83: Bottom outlets are prohibited on tank car tanks transporting sulfuric acid in concentrations over 65.25 percent.
• B84: Packagings must be protected with non-metallic linings impervious to the lading or have a suitable corrosion allowance for sulfuric acid or spent sulfuric acid in concentration up to 65.25 percent.
• IB2: Authorized IBCs: Metal (31A, 31B and 31N); Rigid plastics (31H1 and 31H2); Composite (31HZ1).
• N34: Aluminum construction materials are not authorized for any part of a packaging which is normally in contact with the hazardous material.

T8, TP2 are portable tank instructions or provisions, defined in 172.102(c)(7) and (c)(8). They are on the row but are not reproduced on this page.

What else to know about this entry

The special-provision string is A3, A7, B3, B83, B84, IB2, N34, T8, TP2. Two bulk-tank codes are specific to this acid. B83 says bottom outlets are prohibited on tank car tanks transporting sulfuric acid in concentrations over 65.25 percent. B84 says packagings must be protected with non-metallic linings impervious to the lading or have a suitable corrosion allowance for sulfuric acid or spent sulfuric acid in concentration up to 65.25 percent.

A7 says steel packagings must be corrosion-resistant or have protection against corrosion, and N34 says aluminum construction materials are not authorized for any part of a packaging normally in contact with the hazardous material. Both are packaging material limits, not hazard classification.

Column 10B shows stowage codes 14, 53 and 58, with category C in column 10A. In 176.84, 14 reads "For metal drums, stowage permitted under deck on cargo vessels", 53 reads "separated from alkaline compounds" and 58 reads "separated from cyanides". These are water-shipment codes.

Air quantity limits and a worked example

Columns 9A and 9B give the largest net quantity allowed in one package: column 9A for passenger-carrying aircraft or passenger-carrying rail car, column 9B for cargo aircraft only. 172.101(j) says "Forbidden" means the material may not be offered for transportation or transported in the applicable mode, and that the limit is net unless stated otherwise. For UN1830 the row shows 1 L in column 9A and 30 L in column 9B.

Worked example, 20 L net in one package. Passenger aircraft or rail car (column 9A, 1 L): over 1 L. Cargo aircraft only (column 9B, 30 L): within 30 L. The calculator above applies the same comparison to the quantity you type.

Highway placard check

Class 8 is on Table 2 of 172.504(e) as CORROSIVE.

For Table 2 materials moved by highway or rail, 172.504(c) says placards are not required on a transport vehicle or freight container that contains less than 454 kg (1,001 pounds) aggregate gross weight of hazardous materials covered by Table 2, except for bulk packagings and hazardous materials subject to 172.505. In the calculator, 1,000 pounds of non-bulk Table 2 material returns "not required" and 1,001 pounds returns "required", and any bulk packaging returns "required". The weight is the aggregate gross weight of all Table 2 materials on the vehicle, not just this one UN number.

Vessel stowage and the ERG guide

Column 10A gives category C (the material must be stowed "on deck only" on a cargo vessel or on a passenger vessel). Column 10B lists 14, 53, 58. Code 14 in 176.84: For metal drums, stowage permitted under deck on cargo vessels. Code 53 in 176.84: Stow "separated from" alkaline compounds. Code 58 in 176.84: Stow "separated from" cyanides. These apply to shipments by vessel and have no effect on a truck-only move.

The Emergency Response Guidebook 2024 numerical index lists UN1830 under Guide 137, titled "Substances - Water-Reactive - Corrosive". 172.101 itself does not list ERG guide numbers; the guide number comes from the PHMSA guidebook. The guide is for first responders during the initial phase of an incident and is not a shipping-paper or compliance document.

What this page does not do

It reproduces the table row and the regulation text it points to, and applies the air-limit and 1,001 pound placard comparisons to numbers you enter. It does not classify a product, pick a packing group, decide which table row applies to your shipment, or replace the packaging sections the row points to (the 173 sections in columns 8A to 8C), the marking, labelling and shipping paper rules in part 172, or hazmat training. Hazardous materials employees must be trained; that decision and the shipping description belong to a trained person. The eCFR header for 172.101 links an amendment published at 91 FR 49310 (August 4, 2026); confirm that the version you rely on includes the latest changes. In an emergency call 911 and the emergency response telephone number on the shipping paper.

Sources

Sources opened and read November 2, 2026. Regulation text was read from the eCFR API, which publishes the current Code of Federal Regulations.

• 49 CFR 172.101, Hazardous Materials Table (eCFR text current through October 29, 2026; read November 2, 2026)
• 49 CFR 172.102, Special provisions (read November 2, 2026)
• 49 CFR 172.504, General placarding requirements (read November 2, 2026)
• 49 CFR 173.136, hazard class definitions (read November 2, 2026)
• 49 CFR 176.84, Other requirements for stowage, cargo handling, and segregation (read November 2, 2026)
• PHMSA: Emergency Response Guidebook 2024 English PDF, numerical index (read via the Internet Archive capture of October 31, 2026; read November 2, 2026)