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Billing Code - PHMSA - Department of Transportation

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document regarding proposed modifications to the UN test series 7 for consideration by the<br />

UN Subcommittee <strong>of</strong> Experts on the Transport <strong>of</strong> Dangerous Goods. Test series 7 is used<br />

to classify explosives into the appropriate class. 1 This paper sought to modify the test<br />

series 7 to more accurately address the classification <strong>of</strong> Division 1.6. Specifically,<br />

Division 1.6 is for extremely insensitive detonating articles and the proposed changes in<br />

the US/UK paper are designed to ensure that the probability <strong>of</strong> accidental initiation or<br />

propagation <strong>of</strong> an article attaining this division remains negligible.<br />

In the 17th Revised Edition <strong>of</strong> the UN Model Regulations, the proposals presented<br />

in the US/UK paper regarding the UN test series 7 were adopted. Among the adopted<br />

proposals was the addition <strong>of</strong> various explosive specific definitions referencing the<br />

modifications to the UN test series 7. In this final rule, we are revising the various<br />

definitions prescribed in § 173.59. Specifically, we revised the definition for “Articles,<br />

explosive, extremely insensitive (Articles, EEI)” by removing the word “detonating” and<br />

adding the words “tools” after “starter pistols” in the definition for “Cartridges, blank.”<br />

We also replaced the definition for “Explosive, extremely insensitive detonating<br />

substances (EIDS)” with a new definition for “Explosive, extremely insensitive substances<br />

(EIS).” Lastly, we added a definition for “Auxiliary explosive component, isolated.” The<br />

addition <strong>of</strong> and revisions to these definitions provide consistency with international<br />

regulations and clarity when utilizing the UN test series 7 for explosive classification.<br />

<strong>PHMSA</strong> received one comment form SAAMI that requested we revise the<br />

1 The scientific data regarding the adoption <strong>of</strong> these modifications are presented in working paper ST/SG/AC.10/C.3/2010/40 entitled<br />

“Proposed modifications to Test Series 7.” This paper can be viewed at the following URL:<br />

http://www.unece.org/fileadmin/DAM/trans/doc/2010/ac10c3/ST-SG-AC10-C3-2010-40e.pdf<br />

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