The Chemicals (Hazard Information and Packaging for Supply) Regulations 1994

Gaseous preparations

3.2  For gases that produce severe effects after repeated or prolonged exposure (R48/route of exposure), the individual concentration limits specified in Table IIIA below, e⅔ xpressed as a volume/volume percentage, determine, when appropriate, the classification of the preparation.

TABLE IIIA
Classification of the substance (gas)Classification of the preparation
TXn
(*)

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.

T + with R48/route of exposureconcentration > 5% R48(*) obligatory0.5% < concentration < 5% R48(*) obligatory
Xn with R48/route of exposureconcentration > 5% R48(*) obligatory