# The Chemicals (Hazard Information and Packaging) Regulations 1993, Paragraph 4: CORROSIVE AND IRRITANT EFFECTS


Solid and liquid preparations
(1) —For substances that produce corrosive effects (R34, R35) or irritant effects (R36, R37, R38, R41), the individual concentration limits specified in Table IV determine, when appropriate, the classification of solid and liquid preparations.
TABLE IV
Classification of the substance and/or relevant standard risk phrase
Classification of the preparation and standard risk phrase
at least C with R35
at least C with R34
at least Xi with R41
at least Xi with R36, R37, R38
at least C with R35
conc. ≥ 10% R35 obligatory
5% ≤ conc. < 10% R34 obligatory
1% ≤ conc. < 5% R36, R38 obligatory
at least C with R34
conc. ≥ 10% R34 obligatory
5% ≤ conc. < 10% R36, R38 obligatory
at least Xi with R41
conc. ≥ 10% R41 obligatory
5% ≤ conc. < 10% R36 obligatory
at least Xi with R36, R37, R38
conc. ≥ 20% R36, R37 and R38 are obligatory in light of the concentration present if they apply to the substances under consideration
Gaseous Preparations
(2) —For gases that produce corrosive effects (R34, R35) or irritant effects (R37, R41), the individual concentration limits specified in Table IVA below, expressed as a volume/volume percentage determine, when appropriate, the classification of gaseous preparations and shall determine which particular risk phrases are to be assigned to them.
TABLE IVA
Classification of the substance (gas) and/or relevant standard risk phrase
Classification of the gaseous preparation and standard risk phrase
at least C with R35
at least C with R34
at least Xi with R41
at least Xi with R36, R37 or R38
at least C with R35
conc. ≥ 1% R35 obligatory
0.2% ≤ conc. < 1% R34 obligatory
0.02% ≤ conc. < 0.2% R37 obligatory
at least C with R34
conc. ≥ 5% R34 obligatory
0.5% ≤ conc. < 5% R37 obligatory
at least Xi with R41
conc. ≥ 5% R41 obligatory
0.5% ≤ conc. < 5% R36 obligatory
at least Xi with R36, R37, R38
conc. ≥ &5percnt; R37, R36, R38 obligatory as appropriate

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Source: https://www.legislation.gov.uk/uksi/1993/1746/schedule/4/part/II/paragraph/4 (the official version)
Page: https://openlegislation.uk/chemicals-hazard-information-and-packaging-regulations-1993/schedule-4/part-II/paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.