![]() 35 standard sieve) is now considered an appropriate size criterion. For consistency with other standards, 500µm (capable of passing through a U.S. Department of Transportation ( 49 CFR 172.102, note 137), the United Nations Recommendations on the Transport of Dangerous Goods, the International Maritime Organization (the International Maritime Dangerous Goods Code), and the International Civil Aviation Organization's Technical Instructions, with the removal of the flammable solid designation from densely packed cotton bales, complying with ISO 8115, Cotton Bales - Dimensions and Density, and the exemption of such cotton bales from the corresponding transportation hazardous materials regulations.ĭusts traditionally were defined as material 420 µm or smaller (capable of passing through a U.S. These investigations resulted in harmonization between the U.S. The same research also showed that, when the cotton bales were exposed to smoldering cigarettes, matches, and open flames (including the gas burner ignition source used for the mattress tests, ASTM E 1590, Standard Test Method for Fire Testing of Mattresses, and California Technical Bulletin 129), the probability of initiating flaming combustion was at such a low level as not to qualify the densely packed cotton bales as flammable solids. The research showed that such cotton bales (densely packed cotton bales) did not undergo self-heating nor spontaneous combustion, and that the likelihood of sustained smoldering combustion internal to the cotton bale, creating a delayed fire hazard, was extremely low. Department of Agriculture, and others (Wakelyn and Hughs, 2002), investigated the flammability of cotton bales with a packing density of at least 22 lb/ft 3 (360 kg/m 2).
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