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UN/NA 1931 · Zinc dithionite
UN/NA 1931 · ERG 2024 · Guide 171
- UN/NA
- 1931
- Edition
- ERG 2024
ERG 2024 lists UN/NA 1931 (Zinc dithionite) under Guide 171, titled “Substances (Low to Moderate Hazard)”.
Material name
1931 on a placard, orange panel or shipping paper
It can stand for any of three ERG 2024 entries: “Zinc dithionite”, “Zinc hydrosulfite” and “Zinc hydrosulphite”. All use Guide 171, so the number alone is enough to find the guide. On a numbered orange panel, 1931 is the lower number (how to read an orange panel).
ERG 2024 markings for 1931
1931 is highlighted in green, so ERG 2024 Table 1 (Initial Isolation and Protective Action Distances) has an entry for it: “Zinc dithionite (when spilled in water)”. Hazora shows those distances in the app, not on this page. “When spilled in water” means the material produces large amounts of toxic inhalation hazard (TIH) gases when spilled in water. Table 2 (Water-Reactive Materials Which Produce Toxic Gases) lists the gases produced: H2S (hydrogen sulfide) and SO2 (sulfur dioxide). Its guide number 171 has no P.
Entries near 1931
By number (yellow pages): before 1931 come UN/NA 1923 Calcium dithionite (Guide 135); UN/NA 1928 Methyl magnesium bromide in ethyl ether (Guide 138) and UN/NA 1929 Potassium dithionite (Guide 135); after it, UN/NA 1932 Zirconium scrap (Guide 135); UN/NA 1935 Cyanide solution, n.o.s. (Guide 157) and UN/NA 1938 Bromoacetic acid, solution (Guide 156).
By name (blue pages): “Zinc dithionite” comes after Zinc chloride, solution (UN/NA 1840, Guide 154) and Zinc cyanide (UN/NA 1713, Guide 151) and before Zinc dross (UN/NA 1435, Guide 138) and Zinc dust (UN/NA 1436, Guide 138).
By name (blue pages): “Zinc hydrosulfite” comes after Zinc dust (UN/NA 1436, Guide 138) and Zinc fluorosilicate (UN/NA 2855, Guide 151) and before Zinc nitrate (UN/NA 1514, Guide 140) and Zinc permanganate (UN/NA 1515, Guide 140).
By name (blue pages): “Zinc hydrosulphite” comes after Zinc dust (UN/NA 1436, Guide 138) and Zinc fluorosilicate (UN/NA 2855, Guide 151) and before Zinc nitrate (UN/NA 1514, Guide 140) and Zinc permanganate (UN/NA 1515, Guide 140).
Other names starting with “Zinc”: Zinc arsenite (UN/NA 1712, Guide 151); Zinc bromate (UN/NA 2469, Guide 140); Zinc chlorate (UN/NA 1513, Guide 140); Zinc chloride, anhydrous (UN/NA 2331, Guide 154); Zinc peroxide (UN/NA 1516, Guide 143) and Zinc phosphide (UN/NA 1714, Guide 139).
Guide 171 · Library
Guide 171 covers 36 UN/NA numbers. The 12 around 1931 in the guide’s number order: UN/NA 1841 Acetaldehyde ammonia; UN/NA 1941 Dibromodifluoromethane; UN/NA 1990 Benzaldehyde; UN/NA 2211 Polymeric beads, expandable; UN/NA 2212 Asbestos; UN/NA 2216 Fish meal, stabilized; UN/NA 2315 PCB, liquid; UN/NA 3509 Packagings discarded, empty, uncleaned; UN/NA 3530 Engine, internal combustion; UN/NA 3548 Articles containing miscellaneous dangerous goods, n.o.s.; UN/NA 3559 Fire suppressant dispersing devices; UN/NA 8000 Consumer commodity.
Source: ERG 2024 (U.S. DOT PHMSA, Transport Canada, SICT Mexico), for the initial phase of a transportation incident only. Hazora is not an official ERG publication and is not affiliated with or endorsed by these or any other government agencies.