# The Planning (Hazardous Substances) Regulations 2015, Paragraph 16


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.

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Source: https://www.legislation.gov.uk/uksi/2015/627/schedule/1/part/4/paragraph/16 (the official version)
Page: https://openlegislation.uk/planning-hazardous-substances-regulations-2015/schedule-1/part-4/paragraph-16
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.