This entry applies only to aqueous solutions comprised of water, tetramethylammonium hydroxide (TMAH), and no more than 1 per cent other constituents. Other formulations containing tetramethylammonium hydroxide must be assigned to an appropriate generic or n.o.s. entry (e.g. UN 2927, Toxic liquid, corrosive, organic, n.o.s., etc.), except as follows:

a) Other formulations containing a surfactant in a concentration of more than 1 per cent and with not less than 8.75 per cent tetramethylammonium hydroxide must be assigned to UN 2927 Toxic liquid, corrosive, organic, n.o.s., Packing Group I; and

b) Other formulations containing a surfactant in a concentration of more than 1 per cent and with more than 2.38 per cent but less than 8.75 per cent tetramethylammonium hydroxide must be assigned to UN 2927, Toxic liquid, corrosive, organic, n.o.s., Packing Group II.