The Explosives (Hazard Information and Packaging for Supply) Regulations (Northern Ireland) 2009

Gaseous preparations

4.2  For gases that produce such effects (R34, R35 or R36, R37, R38, R41), the individual concentration limits specified in Table IVA, expressed as a volume/volume percentage determine, when appropriate, the classification of the preparation.

Table IVA

Classification of the substance (gas)	Classification of the preparation
	C with R35	C with R34	Xi with R41	Xi with R36, R37 R38
(*) According to the approved classification and labelling guide, when a substance or preparation is classified as corrosive and assigned the risk phrase R34 or R35, the risk of severe damage to the eyes is considered implicit and the risk phrase R41 is not included on the label. Consequently, if the preparation contains corrosive substances with R35 or R34 below the concentration limits for a classification of the preparation as corrosive, such substances can contribute to a classification of the preparation as irritant (R41) or irritant (R36).
Note Simple application of the conventional method to preparations containing substances classified as corrosive or irritant may result in under-classification or over-classification of the hazard, if other relevant factors (e.g. pH of the preparation) are not taken into account. Therefore, in classifying for corrosivity, consider the advice given in approved classification and labelling guide regarding classification as corrosive and paragraph 4(4)(b) and (c) of Part I of this Schedule.
C with R35	concentration ≥ 1% R35 obligatory	0.2% ≤ concentration < 1% R34 obligatory	0.2%(*)	0.02% ≤ concentration < 0.2% R36/37/38 obligatory
C with R34		concentration ≥ 5% R34 obligatory	5%(*)	0.5% ≤ concentration < 5% R36/37/38 obligatory
Xi with R41			concentration ≥ 5% R41 obligatory	0.5% ≤ concentration < 5% R36 obligatory
Xi with R36, R37, R38				concentration ≥ 5% R36, R37, R38 are obligatory as appropriate