GHS Classification Guidance for the Japanese Government

(3) Guidance for Classification
A) Judgment of Not applicable
1) Substances for gases shall be judged as “Not applicable”.
2) Substances not containing metals or metalloids in their chemical structure shall be judged
as “Not applicable”.
B) Judgment of Not Classified
If it is judged based on the information of prescribed review documents that a substance
containing metals or metalloids is stable even if it is in contact with water (for example, if it is
produced using water or is washed using water or if its aqueous solubility is known from
literatures), fill in “Classification result” with “Not classified”, and fill in “Classification
Grounds” with “Stable to water”.
Reference: UN GHS second revised edition 2.12.4.2(b)(c)
C) Classification based on TDG Classification
If the name of a substance is included in TDG classification, the substance shall be classified
according to it. If not, it falls under “Classification not possible” in principle.
(4)Data availability
Few numerical data on the rate of evolution of gas have been published.
(5)Comparison with conventional classification systems
Judgment criteria of GHS2.12.2 completely accord with the definition of UNRTDG
Classification 4.3.
Judgment criteria of EU classification accord with those of GHS, but further categorization is
not given for the former.
(6)Sources of information for classification results under conventional systems
Based on the laws and regulations pursuant to the applicable UNRTDG (In Japan, “Dangerous
Goods Regulations” correspond to them).
Category 1 = UNRTDG･4.3 I
Category 2 = UNRTDG･4.3 II
Category 3 = UNRTDG･4.3 III
Substances classified into UNRTDG･4.2 (4.3) correspond to GHS Category 1.
Substances classified into EU Classification R15 meet GHS judgment criteria, but they are not
further categorized.
In ERG, Schedules related to “Substances which, in contact with water, emit flammable gases”
of GHS are as follows:
135: Pyrophoric substances
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