GHS Classification Guidance for the Japanese Government

(4) Data availability
Physical properties of gaseous substances are relatively easy to obtain. All of
combustible/flammable gases at ambient temperature and pressure shall be flammable gases.
When data of combustible range (what is called explosive limit) are available, it is easy to pass a
judgment for classification of a single gas.
(5) Comparison with conventional classification systems
The definition of Class 2.1 described in UNRTDG 2.2.2.1 accords with that of GHS Category 1.
It corresponds to Schedule F-D in EmS. S-U also includes toxic gases, etc. In ERG, the provisions
for flammable gases are divided into Schedules 115, 116, 117, 118, and 119.
In EU classification, gaseous substances with R-Phrase 3 12(hereinafter, abbreviated as R12)
meet these criteria (Categories 1 and 2), but no categorization is shown.
(6) Sources of information for classification results under conventional systems
Category 1 =UNRTDG2.1and 2.3.2(2.1)
Category 2 =Flammable gas which is not included in Category 1
Only flammable gases in such a state (compressed or liquefied) that meets definitions of gases
under pressure described in 2-3-5 are subject to the “Class 2, Gases” in UNRTDG.
In GHS, “flammable gases” may include gases with ambient pressure because of the omission
of the condition of gases under pressure.
Example of category 1)
UNRTDG2.1 1012 BUTYLENE
1036 ETHYLAMINE
1049 HYDROGEN, COMPRESSED
1978 PROPANE
2203 SILANE
2454 METHYL FLUORIDE (REFRIGERANT GAS R 41)
3153 PERFLUORO(METHYL VINYL ETHER)
UNRTDG2.3(2.1) 1053 HYDROGEN SULPHIDE
1082 RIFLUOROCHLOROETHYLENE, STABILIZED
2188 ARSINE
2204 CARBONYL SULPHIDE
Example of category 2) 1062 METHYL BROMIDE with not more than 2% chloropicrin
3 For R-Phrase, see Appendix.
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