{"id":321,"date":"2007-03-01T11:15:41","date_gmt":"2007-03-01T11:15:41","guid":{"rendered":"http:\/\/www.jpyro.com\/wp\/?p=321"},"modified":"2007-03-03T04:24:21","modified_gmt":"2007-03-03T04:24:21","slug":"an-example-of-negative-explosives-magnesium-sulfatemagnesium-mixture","status":"publish","type":"post","link":"https:\/\/www.jpyro.co.uk\/?p=321","title":{"rendered":"An Example of Negative Explosives: Magnesium Sulfate\/Magnesium Mixture"},"content":{"rendered":"<p align=\"left\"><strong>Dr Takeo Shimizu<\/strong><\/p>\n<p align=\"left\"><strong>ABSTRACT:<\/strong><\/p>\n<p align=\"left\">At the Eleventh International Pyrotechnics Seminar, 1986, in Vail, Colorado, I reported on a study of pyrotechnic mixtures with a theme, &ldquo;A Concept and the Use of Negative Explosives&rdquo;. A further study has been continued on the same subject as before. In the former report it was known that magnesium sulfate\/magnesium mixture detonates on heating. I studied if it is suitable for the noise mixture of fireworks in place of the ordinary one which contains aluminum and potassium perchlorate and which has long been a cause of serious accidents in the firework industry. The chemical reaction of the magnesium sulfate\/magnesium mixture on detonation is thought to be:<\/p>\n<p align=\"left\">MgSO<sub>4<\/sub> + 4 Mg &rarr; MgS + 4 MgO + 353 kcal.<\/p>\n<p align=\"left\">From several experiments following results were obtained:<\/p>\n<p align=\"left\">(1) The intensity of the explosive noise from the magnesium sulfate\/magnesium mixture is almost the same as that from the ordinary aluminum mixture when the weight of the charge of the former is two or two and a half times as large as that of the latter.<\/p>\n<p align=\"left\">(2) The magnesium sulfate\/magnesium mixture is far safer on handling than the ordinary aluminum mixture. It was proved by an iron ball dropping test and a fire propagation test.<\/p>\n<p align=\"left\">(3) The tone quality of the noise from the magnesium sulfate\/magnesium mixture is mild and superior to that from the ordinary aluminum mixture.<\/p>\n<p align=\"left\">(4) In practical use it is necessary to protect the noise unit which contains the magnesium sulfate\/magnesium mixture from moisture.<\/p>\n<hr \/>\n<p><em>(SH1_033)<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Dr Takeo Shimizu ABSTRACT: At the Eleventh International Pyrotechnics Seminar, 1986, in Vail, Colorado, I reported on a study of pyrotechnic mixtures with a theme, &ldquo;A Concept and the Use of Negative Explosives&rdquo;. A further study has been continued on the same subject as before. In the former report it was known that magnesium sulfate\/magnesium &hellip;<br \/><a href=\"https:\/\/www.jpyro.co.uk\/?p=321\" class=\"more-link pen_button pen_element_default pen_icon_arrow_double\">Continue reading <span class=\"screen-reader-text\">An Example of Negative Explosives: Magnesium Sulfate\/Magnesium Mixture<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[35,29],"tags":[],"_links":{"self":[{"href":"https:\/\/www.jpyro.co.uk\/index.php?rest_route=\/wp\/v2\/posts\/321"}],"collection":[{"href":"https:\/\/www.jpyro.co.uk\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.jpyro.co.uk\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.jpyro.co.uk\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.jpyro.co.uk\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=321"}],"version-history":[{"count":0,"href":"https:\/\/www.jpyro.co.uk\/index.php?rest_route=\/wp\/v2\/posts\/321\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.jpyro.co.uk\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=321"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.jpyro.co.uk\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=321"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.jpyro.co.uk\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=321"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}