GHS Classification Guidance for the Japanese Government
GHS Classification Guidance for the Japanese Government GHS Classification Guidance for the Japanese Government
2-3-4 Oxidizing Gases (1)Definitions Definitions of oxidizing gases in UN GHS are as follows, and they are adopted in this guidance. 【GHS 2 nd revised edition】(2.4.1) An oxidizing gas is any gas which may, generally by providing oxygen, cause or contribute to the combustion of other material more than air does. (2)Classification criteria in GHS 【GHS 2 nd revised edition】 (2.4.2) An oxidizing gas is classified in a single category for this class according to the following table: Table 2.4.1: Criteria for oxidizing gases Category Criteria 1 A ny gas which may, generally by providing oxygen, cause or contribute to the combustion of other material more than air does. NOTE: Artificial air containing up to 23.5% oxygen by volume may be regarded as not oxidizing for some regulatory purposes (e.g. transport) (3) Guidance for Classification A) Judgment of Not applicable A product which does not meet the GHS definition of gases shall be judged as “Not applicable”. B) Classification based on TDG Classification etc The substance to be evaluated that is listed as a dangerous good (a gas product whose division number of for its subsidiary hazard is 5.1) in the Dangerous Goods List based on TDG classification shall belong to “Category 1”. The following gases described in ISO10156-2 shall also belong to “Category 1”. Bis-trifluoromethylperoxide C і = 40 Bromine pentafluoride C і = 40 Bromine trifluoride C і = 40 Chlorine C і = 0.7 Chlorine pentafluoride C і = 40 Chlorine trifluoride C і = 40 Fluorine C і = 40 Iodine pentafluoride C і = 40 Nitric oxide C і = 0.6 Nitrogen dioxide C і = 1 46
Nitrogen trifluoride C і = 1.6 Nitrogen trioxide C і = 40 Oxygen difluoride C і = 40 Ozone C і = 40 Tetrafluorohydrazine C і = 40 For reference:ISO10156-2, describing an international test method on “oxidizing gases” was established in August 2005. Since the description of 2.4.4.1 in the GHS second revised edition is based on that of ISO10156:1996, it is expected to be amended in the future. Because this test requires an immense amount of time and effort and involves risk of explosion, the measurement results for coefficient of oxygen equivalency have been obtained only for a few substances before the establishment of the ISO. C) Judgment of Not Classified Other (non-oxidizing) gases than described above shall be judged as “Not classified”. (4)Data availability Calculation should be performed in accordance with ISO-10156-2, based on the composition. Obtained coefficients of oxygen equivalency would be different from that described in the GHS second revised edition. Coefficients obtained through the ISO method should be used. (5)Comparison with conventional classification systems The UNRTDG definition (UNRTDG2.5.2) for oxidizing substances (Division 5.1) is limited to liquids and solids. In UNRTDG, no classification criteria are available for oxidizing gases, while some gases are assigned with the division number 5.1 for their subsidiary hazard, but the assignment is not comprehensive. Oxidizing gases fall under Schedule 122 in ERG and S-W in EmS, on the basis of which oxidizing gases can be selected. Nitrogen trifluoride and all gases listed thereafter in the next section are categorized as “all other oxidizing gases”. (6)Sources of information for classification results under conventional systems Gases classified as Classes 2.2(5.1), 2.3(5.1), and 2.3(5.1, 8)in the third and forth columns of the UNRTDG Dangerous Goods List fall under this class. In addition, some of gases classified as Classes 2.2 and 2.3 can fall under “oxidizing gases” even if their subsidiary hazards are not specified. For transport of dangerous goods, only those classified as “Gases Under Pressure” are subject to regulation, while gases with ambient pressure are also included in the GHS class because of the absence of such conditions in GHS. (Example) UNRTDG2.2 (5.1) 47
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Nitrogen trifluoride C і = 1.6<br />
Nitrogen trioxide C і = 40<br />
Oxygen difluoride C і = 40<br />
Ozone C і = 40<br />
Tetrafluorohydrazine C і = 40<br />
For reference:ISO10156-2, describing an international test method on “oxidizing gases”<br />
was established in August 2005. Since <strong>the</strong> description of 2.4.4.1 in <strong>the</strong> <strong>GHS</strong> second<br />
revised edition is based on that of ISO10156:1996, it is expected to be amended in <strong>the</strong><br />
future. Because this test requires an immense amount of time and ef<strong>for</strong>t and involves<br />
risk of explosion, <strong>the</strong> measurement results <strong>for</strong> coefficient of oxygen equivalency have<br />
been obtained only <strong>for</strong> a few substances be<strong>for</strong>e <strong>the</strong> establishment of <strong>the</strong> ISO.<br />
C) Judgment of Not Classified<br />
O<strong>the</strong>r (non-oxidizing) gases than described above shall be judged as “Not classified”.<br />
(4)Data availability<br />
Calculation should be per<strong>for</strong>med in accordance with ISO-10156-2, based on <strong>the</strong> composition.<br />
Obtained coefficients of oxygen equivalency would be different from that described in <strong>the</strong> <strong>GHS</strong><br />
second revised edition. Coefficients obtained through <strong>the</strong> ISO method should be used.<br />
(5)Comparison with conventional classification systems<br />
The UNRTDG definition (UNRTDG2.5.2) <strong>for</strong> oxidizing substances (Division 5.1) is limited to<br />
liquids and solids. In UNRTDG, no classification criteria are available <strong>for</strong> oxidizing gases, while<br />
some gases are assigned with <strong>the</strong> division number 5.1 <strong>for</strong> <strong>the</strong>ir subsidiary hazard, but <strong>the</strong><br />
assignment is not comprehensive. Oxidizing gases fall under Schedule 122 in ERG and S-W in<br />
EmS, on <strong>the</strong> basis of which oxidizing gases can be selected.<br />
Nitrogen trifluoride and all gases listed <strong>the</strong>reafter in <strong>the</strong> next section are categorized as “all<br />
o<strong>the</strong>r oxidizing gases”.<br />
(6)Sources of in<strong>for</strong>mation <strong>for</strong> classification results under conventional systems<br />
Gases classified as Classes 2.2(5.1), 2.3(5.1), and 2.3(5.1, 8)in <strong>the</strong> third and <strong>for</strong>th columns of<br />
<strong>the</strong> UNRTDG Dangerous Goods List fall under this class. In addition, some of gases classified as<br />
Classes 2.2 and 2.3 can fall under “oxidizing gases” even if <strong>the</strong>ir subsidiary hazards are not<br />
specified.<br />
For transport of dangerous goods, only those classified as “Gases Under Pressure” are subject<br />
to regulation, while gases with ambient pressure are also included in <strong>the</strong> <strong>GHS</strong> class because of <strong>the</strong><br />
absence of such conditions in <strong>GHS</strong>.<br />
(Example) UNRTDG2.2 (5.1)<br />
47
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