﻿ UN 1831: Sulfuric acid, fuming with less than 30 percent free sulfur trioxide - Substance information – HazMat Tool

Sulfuric acid, fuming with less than 30 percent free sulfur trioxide

Sulfuric acid (American spelling) or sulphuric acid (Commonwealth spelling), also known as oil of vitriol, is a mineral acid composed of the elements sulfur, oxygen and hydrogen, with the molecular formula H2SO4. It is a colorless, odorless and viscous liquid that is miscible with water.Pure sulfuric acid does not exist naturally due to its strong affinity to water vapor; for this reason, it is hygroscopic and readily absorbs water vapor from the air. Concentrated sulfuric acid is highly corrosive towards other materials, from rocks to metals since it is an oxidant with powerful dehydrating nature. Phosphorus pentoxide is a notable exception of not being affected by the acid's dehydrating property, which reversely dehydrates sulfuric acid to sulfur trioxide. Wikipedia

Substance Data

Source: TOXNET



Flash Point


Boiling Point


Emergency Response Guide No. 137

Data from the Hazardous Materials Table

Source: 49 CFR §172 (2018/07)

(3) Hazard Class

Corrosive liquids

(4) Identification number Help

UN 1831

(5) Packing Group Help


(6) Labels Help

Corrosive liquids (8) Cargo Aircraft Only (Cargo Aircraft Only)

(7) Special Provisions (§172.102) Help



(8A) ExceptionsNone
(8B) Non-bulk201see 49 CFR §173.201
(8C) Bulk243see 49 CFR §173.243

(9) Quantity Limits Help

(9A) Passenger aircraft/railForbidden
(9B) Cargo aircraft only2.5 L

(10) Vessel stowage Help

(10A) Location
(10B) Other

Segregation Chart for Load, Transport, Storage


green Load, transport, storage together is not restricted.
yellow Load, transport, storage together is allowed under restrictions.