{"id":51,"date":"2007-01-19T15:17:20","date_gmt":"2007-01-19T15:17:20","guid":{"rendered":"http:\/\/www.jpyro.com\/wp\/?p=51"},"modified":"2007-01-21T18:34:39","modified_gmt":"2007-01-21T18:34:39","slug":"effect-of-particle-size-on-the-mechanical-sensitivity-and-thermal-stability-aspects-of-pyrotechnic-flash-compositions","status":"publish","type":"post","link":"http:\/\/www.jpyro.co.uk\/?p=51","title":{"rendered":"Effect of Particle Size on the Mechanical Sensitivity and Thermal Stability aspects of Pyrotechnic Flash Compositions"},"content":{"rendered":"<p align=\"left\"><strong><strong><font face=\"TimesNewRomanPS-BoldMT\">S. P. Sivapirakasam,<\/font><font face=\"TimesNewRomanPS-BoldMT\"> <\/font><font face=\"TimesNewRomanPS-BoldMT\">M. Surianarayanan,<\/font><font face=\"TimesNewRomanPS-BoldMT\">* F. Chandrasekaran<\/font><font face=\"TimesNewRomanPS-BoldMT\"> <\/font><font face=\"TimesNewRomanPS-BoldMT\">and G. Swaminathan<\/font><font face=\"TimesNewRomanPS-BoldMT\"><\/font><\/strong><\/strong><\/p>\n<p align=\"left\"><strong>Abstract:<\/strong> The mechanical and thermal sensitivity of pyrotechnic flash compositions consisting of mixtures of potassium nitrate (KNO3), sulphur (S) and aluminum (Al) with varying particle sizes of KNO3 and Al indicated that, irrespective of the composition of the cracker mixture, all the compositions were found to be thermally and mechanically sensitive. Although the impact sensitivity results reflected the change in the surface area of the particle sizes, the changes were within a narrow range of limiting impact energy (LIE) (7.5&ndash;9.1 J). Further it was difficult to pinpoint a particular sieve fraction as sensitive since the response to explosion depended normally on the flash composition and the particle size but also on the density and the compactness of the chemicals DSC studies on the effect of the Al particle size showed that a decrease in the Al particle size led to a second exothermic activity. This behavior should be viewed with caution when considering safety aspects.<\/p>\n<p align=\"left\"><strong>Keywords:<\/strong> pyrotechnics, flash composition, fireworks, impact sensitiveness, friction sensitiveness, differential scanning calorimeter, potassium nitrate, sulphur, aluminum<\/p>\n<hr \/>\n<p><em><strong>Ref:<\/strong> JPyro, Issue 23, 2006,&nbsp;pp39-50<br \/> (J23_39)<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>S. P. Sivapirakasam, M. Surianarayanan,* F. Chandrasekaran and G. Swaminathan Abstract: The mechanical and thermal sensitivity of pyrotechnic flash compositions consisting of mixtures of potassium nitrate (KNO3), sulphur (S) and aluminum (Al) with varying particle sizes of KNO3 and Al indicated that, irrespective of the composition of the cracker mixture, all the compositions were found &hellip;<br \/><a href=\"http:\/\/www.jpyro.co.uk\/?p=51\" class=\"more-link pen_button pen_element_default pen_icon_arrow_double\">Continue reading <span class=\"screen-reader-text\">Effect of Particle Size on the Mechanical Sensitivity and Thermal Stability aspects of Pyrotechnic Flash Compositions<\/span><\/a><\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[2,29],"tags":[],"_links":{"self":[{"href":"http:\/\/www.jpyro.co.uk\/index.php?rest_route=\/wp\/v2\/posts\/51"}],"collection":[{"href":"http:\/\/www.jpyro.co.uk\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.jpyro.co.uk\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.jpyro.co.uk\/index.php?rest_route=\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"http:\/\/www.jpyro.co.uk\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=51"}],"version-history":[{"count":0,"href":"http:\/\/www.jpyro.co.uk\/index.php?rest_route=\/wp\/v2\/posts\/51\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.jpyro.co.uk\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=51"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.jpyro.co.uk\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=51"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.jpyro.co.uk\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=51"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}