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China adopted UN GHS Rev.4 throughout the Inventory of Hazardous Chemicals and a series of national standards called GB 30000 series. GB 30000.2~30000.29 function as the rules of classification and labeling of chemical substances. Each standard corresponds to one of the 28 hazard classifications specified in UN GHS Rev.4, including 16 physical hazards, 10 health hazards, and 2 environmental hazards.
In 2015 United Nations published the 6th revision of GHS document. In this revision, a new physical hazard classification was added and named desensitized explosives. The desensitized explosives were defined as the explosive substances or mixtures which were phlegmatized to suppress their explosive properties in such a manner that they do not mass explode and do not burn too rapidly and therefore may be exempted from the hazard class “explosives”. This hazard classification comprises solid and liquid desensitized explosives.
On Apr 27th, 2018, Chinese Ministry of Industry and Information Technology (MIIT) announced on its website that a new compulsory national standard was scheduled to be developed and completed in 2019. According to the information revealed in the development schedule, the national standard was related to the classification and labeling of desensitized explosives. So it would be the 29th national standard in the series and the final code of the standard might be GB 30000.31, although logically the code GB 30000.17 is more appropriate.
The supplementation of desensitized explosives was not the only revision that UN made to the GHS system in Rev.6. Another category under “flammable gases” was also added, named “pyrophoric gas”. It described the flammable gases that ignite spontaneously in air at a temperature of 54℃ or below. However, the development schedule of the national standards of MIIT didn’t mention the supplementation of this category under GB 30000.3 (Rules for classification and labeling of chemicals - Part 3：Flammable gases).
