# The Explosive Substances (Hazard Information) Regulations (Northern Ireland) 2000, Paragraph 1


For the purpose of classifying a substance dangerous for supply in accordance with Part I of this Schedule the flash point shall be determined—
(a) by one of the equilibrium methods referred to in paragraph 3; or
(b) by one of the non-equilibrium methods referred to in paragraph 4, except that when the flash point so determined falls within one of the following ranges, namely:—
(i) −2°C to + 2°C,
(ii) 19°C to 23°C, or
(iii) 53°C to 57°C, that flash point shall be confirmed by one of the equilibrium methods referred to in paragraph 3 using like apparatus.

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Source: https://www.legislation.gov.uk/uksi/2000/1646/schedule/1/part/III/paragraph/1 (the official version)
Page: https://openlegislation.uk/explosive-substances-hazard-information-regulations-northern-ireland-2000/schedule-1/part-III/paragraph-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.