GHS Classification Guidance for the Japanese Government

orohydrides, alkyl compounds, etc.), and a few metalloid compounds shown below
(excluding N.O.S.) are also included in the list.
UN-1183 ETHYLDICHLOROSILANE
UN-1242 METHYLDICHLOROSILANE
UN-1295 TRICHLOROSILANE
UN-1340 PHOSPHORUS PENTASULFIDE
UN-2965 BORON TRIHYDRIDE・DIMETHYL ETHER SOLUTION
As substances included in Class 4.3, the following two carbon compounds (excluding
metal alkylates) are listed:
UN-1394 ALUMINUM CARBIDE
UN-1402 CALCIUM DICARBIDE
Since these substances contain a metal, they are not excluded from “water-reactive
flammable substances” even if carbon is excluded from metalloids.
It is presumed that the description of UN GHS second revised edition 2.12.4.2(a) intends
to eliminate the discussion on classification assessment for huge amounts of organic
compounds composed of only carbon, hydrogen, nitrogen, oxygen, sulfur, and four halogen
elements. The aim will be lost if carbon is included in metalloids.
D) Scope of the metalloid
If phosphorus is interpreted to be excluded from “metalloids” defined in UN GHS second
revised edition 2.12.4.2(a), phosphorus pentasulfide is excluded. Although compounds
composed of selenium, tellurium and nonmetal elements are not considered to be
water-reactive, they are included in the substances containing metalloids.
Alternatively, it is easier to understand if the description in 2.12.4.2(a) is rephrased as
follows: “The classification procedure for this class need not be applied to a substance
composed of carbon, hydrogen, nitrogen, oxygen, sulfur, and one or more of four halogen
elements, as well as a mixture (solid or liquid) composed of these elements only”.
Nevertheless, the description of UN GHS second revised edition adopting the term
“metalloids” shall be followed.
If a substance or mixture falls under the exemption described in 2.12.4.2(a), fill the model
classification with “Not applicable”, and fill “Grounds” with “Not containing metal or
metalloids (B, Si, P, Ge, As, Se, Sn, Sb, Te, Bi, Po, At)”.
E) Assessment of inorganic metal compounds
Substances and mixtures exempted from the assessment, based on UN GHS second
revised edition 2.12.4.2(a), are the most part of organic compounds (except for organic metal
compounds) and a part of inorganic compounds. Thus, the large majority of inorganic metal
compounds remain unmentioned. With regard to them, those known to be stable in water
according to UN GHS second revised edition 2.12.4.2(b) (c) shall be classified as “Not
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