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Ammonium nitrate (350/2,500): technical grade This applies to ammonium nitrate and mixtures of ammonium nitrate in which the nitrogen content as a result of the ammonium nitrate is— (a) between 24.5% and 28% by weight, and which contain not more than 0.4% combustible substances; (b) more than 28% by weight, and which contain not more than 0.2% combustible substances. It also applies to aqueous ammonium nitrate solutions in which the concentration of ammonium nitrate is more than 80% by weight.