# The Chemicals (Hazard Information and Packaging for Supply) Regulations 1994, Paragraph 2.2: Gaseous preparations


For gases that produce non-lethal irreversible effects after a single exposure (R39/route of exposure, R40/route of exposure), the individual concentration limits specified in Table IIA, expressed as a volume/volume percentage, determine, when appropriate, the classification of the preparation.
TABLE IIA
Classification of the substance (gas)
Classification of the preparation
T+
T
Xn
(*) In order to indicate the route of administration/exposure the combined R phrases listed in paragraphs 44, 45 and 46 of the approved classification and labelling guide shall be used.
(†) R40 here refers to substances classified as harmful. Concentration limits for substances required to be labelled R40 but classified as carcinogenic or mutagenic are given in Table VI.
T+ with R39/route of exposure
concentration > 1% R39 obligatory
0.2% < concentration < 1% R39 obligatory
0.02% < concentration < 0.2% R40 obligatory
T with R39/route of exposure
concentration > 5% R39 obligatory
0.5% < concentration < 5% R40 obligatory
Xn with R40/route of exposure
concentration > 5% R40 obligatory

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Source: https://www.legislation.gov.uk/uksi/1994/3247/schedule/3/paragraph/2.2 (the official version)
Page: https://openlegislation.uk/chemicals-hazard-information-and-packaging-for-supply-regulations-1994/schedule-3/paragraph-2.2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.