# Chemicals (Hazard Information and Packaging) Regulations (Northern Ireland) 1993, Part II: CONCENTRATION LIMITS TO BE USED IN APPLYING THE CONVENTIONAL METHOD OF ASSESSING HEALTH EFFECTS IN ACCORDANCE WITH PART I WHERE NO SUCH LIMITS ARE GIVEN IN THE APPROVED SUPPLY LIST


An assessment must be made of the health effects that the use of a substance or a preparation might entail. For that purpose the dangerous health effects have been subdivided into:—
acute lethal effects;
non-lethal irreversible effects after a single exposure;
severe effects after repeated or prolonged exposure;
corrosive effects;
irritant effects;
sensitizing effects;
carcinogenic effects;
mutagenic effects; and
teratogenic effects.
The systematic assessment of all the dangerous health effects is expressed by means of concentration limits in conjunction with the classification of the substance, that is to say, the symbol and risk phrases which are assigned to each substance under consideration.
In relation to solid and liquid preparations any reference to a percentage concentration shall be treated as a reference to that concentration as a percentage by weight.
In relation to gaseous preparations any reference to a percentage concentration shall be treated as a reference to that concentration as a percentage by volume.

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Source: https://www.legislation.gov.uk/nisr/1993/412/schedule/4/part/II (the official version)
Page: https://openlegislation.uk/chemicals-hazard-information-and-packaging-regulations-northern-ireland-1993/schedule-4/part-II
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.