{"id":303833,"date":"2024-10-19T20:46:17","date_gmt":"2024-10-19T20:46:17","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-7164-32-11998\/"},"modified":"2024-10-25T18:19:36","modified_gmt":"2024-10-25T18:19:36","slug":"bs-7164-32-11998","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-7164-32-11998\/","title":{"rendered":"BS 7164-32.1:1998"},"content":{"rendered":"<p><b>1.1<\/b> This International Standard specifies methods using gas chromatography (GC) and thin layer chromatography (TLC) for the separation and identification of the following classes of accelerators in vulcanized and unvulcanized compounds:<\/p>\n<ul>\n<li>\u2014 thiazoles<\/li>\n<li>\u2014 sulfenamides<\/li>\n<li>\u2014 thiurams and dithiocarbamates<\/li>\n<li>\u2014 guanidines<\/li>\n<li>\u2014 dithiodimorpholine<\/li>\n<\/ul>\n<p><b>1.2<\/b> When 2-mercaptobenzothiazole (MBT) is identified and no sulfenamides are present, it is not possible to establish if the original accelerator was MBT and\/or its salts or 2,2\u2019-dibenzothiazoledisulfide (MBTS) as each of these accelerators may be produced from the others during the vulcanization process.<\/p>\n<p><b>1.3<\/b> When sulfenamides are identified, it is not possible to establish if MBT and\/or its salts and MBTS are present as these accelerators may be produced from 2-mercaptobenzothiazole sulfenamides during the vulcanization process.<\/p>\n<p><b>1.4<\/b> The methods do not distinguish thiurams and dithiocarbamates derived from the same amines.<\/p>\n<p><b>1.5<\/b> From the morpholine identification it is not possible to determine if the initial accelerator is 2-morpholinothiobenzothiazole (MBS) or dithiomorpholine as morpholine may be formed from MBS and dithiodimorpholine during the vulcanization process.<\/p>\n<p><b>1.6<\/b> The separation of accelerator compounds from unvulcanized compounds is relatively straightforward whereas separation from vulcanized compounds is difficult due to the lesser ability of solvents to penetrate the vulcanized matrix.<\/p>\n<p><b>1.7<\/b> Some compounding ingredients may interfere with method B. In such cases methods A or C shall be used.<\/p>\n","protected":false},"excerpt":{"rendered":"<p><b>Chemical tests for raw and vulcanized rubber. Methods for determination of accelerators. &#8211; Gas and thin layer chromatography<\/b><\/p>\n<table class=\"shortdes-table\" style=\"width: 100%\" border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td>Published By<\/td>\n<td>Publication Date<\/td>\n<td>Number of Pages<\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/pdfstandards.shop\/product-category\/publishers\/bsi\/\"><b>BSI<\/b><\/a><\/td>\n<td>1998<\/td>\n<td>14<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":303841,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2641],"product_tag":[],"class_list":{"0":"post-303833","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-bsi","8":"first","9":"instock","10":"sold-individually","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/303833","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/303841"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=303833"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=303833"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=303833"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}