ANNEX TO CLASS 4.2
CLASS 4.2 - Spontaneously combustible
THIOUREA DIOXIDE
FORMAMIDINE SULPHINIC
ACID
UN No. Formula
3341 CH4N2O2S
Properties
White to yellow-white crystalline powder.
Virtually odourless.
Strong reducing agent. Violent exothermic decomposition above
lOO℃ with emission of large amounts of sulphur oxides, ammonia,
carbon monoxide, carbon dioxide, nitrogen oxides and hydrogen
sulphide.
Extended exposure to temperatures above 50℃ and moisture may
cause visible decomposition.
Observations
Dust irritating to skin, eyes and mucous membranes.
Packing groupt ? or ?
according to the grouping
criteria