# The Chemicals (Hazard Information and Packaging) Regulations 1993, Paragraph 5: Sensitizing Effects


(1) Solid and liquid preparations—Substances that produce such effects are classified:
at least as harmful (Xn) and assigned R42 if this effect can be produced by inhalation,
at least as irritant (Xi) and assigned R43 if this effect can be produced through contact with the skin,
at least as harmful (Xn) and assigned R42/43 if this effect can be produced in both these ways.
The individual concentration limits specified in Table V determine, when appropriate, the classification of solid and liquid preparations and shall determine which particular risk phrases are to be assigned to them.
TABLE V
Classification of the substance
Classification of the preparation and standard risk phrase
At least Xn and R42
At least Xi and R43
At least Xn and R42
conc. ≥ 1% R42 obligatory
At least Xi and R43
conc. ≥ 1% R43 obligatory
At least Xn and R42/43
conc. ≥ 1% R42/43 obligatory
(2) Gaseous Preparations—Gases that produce such effects are classified:
at least as harmful (Xn) and assigned R42 or R42/43 as appropriate. The individual concentration limits specified in Table VA 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 VA
Classification of the substance (gas)
Classification of the gaseous preparation and standard risk phrase
At least Xn with R42
At least Xn with R42
conc. ≥ 0.2% R42 obligatory
At least Xn with R42/43
conc. ≥ 0.2% R42/43 obligatory

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Source: https://www.legislation.gov.uk/uksi/1993/1746/schedule/4/part/II/paragraph/5 (the official version)
Page: https://openlegislation.uk/chemicals-hazard-information-and-packaging-regulations-1993/schedule-4/part-II/paragraph-5
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.