{"id":882428,"date":"2024-07-02T08:00:02","date_gmt":"2024-07-02T12:00:02","guid":{"rendered":"https:\/\/www.thecompliancecenter.com\/ca\/?p=882428"},"modified":"2025-09-05T07:06:46","modified_gmt":"2025-09-05T11:06:46","slug":"un-specification-marking-s-vs-s","status":"publish","type":"post","link":"https:\/\/www.thecompliancecenter.com\/ca\/help-center\/articles\/un-specification-marking-s-vs-s\/","title":{"rendered":"UN Specification Marking: \u201cS\u201d vs \u201cS\u201d"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-882393\" src=\"https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2024\/06\/ICC_SvsS_June2024_Blog.png\" alt=\"\" width=\"1000\" height=\"300\" srcset=\"https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2024\/06\/ICC_SvsS_June2024_Blog.png 1000w, https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2024\/06\/ICC_SvsS_June2024_Blog-300x90.png 300w, https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2024\/06\/ICC_SvsS_June2024_Blog-768x230.png 768w, https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2024\/06\/ICC_SvsS_June2024_Blog-600x180.png 600w, https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2024\/06\/ICC_SvsS_June2024_Blog-190x57.png 190w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/p>\n<h2>UN Specification Marking: \u201cS\u201d vs \u201cS\u201d<\/h2>\n<p>If you use UN packaging, I\u2019m sure you are aware of the UN Specification marking that is printed on it. The UN specification marking is comprised of a series of codes separated by slashes that provide relevant information about the package being shipped. Learn more about UN markings in our article titled &#8220;<a href=\"https:\/\/www.thecompliancecenter.com\/ca\/what-do-un-markings-on-packages-mean\/\" target=\"_blank\" rel=\"noopener\">What Do UN Markings on Packages Mean?<\/a>\u201d.<\/p>\n<p>If your packaging has an \u201cS\u201d printed on it, it may not be as straight forward as you would think. The \u201cS\u201d can actually have two different meanings depending on how the packaging was tested and what the packaging was tested with.<\/p>\n<p><strong>\u201cS\u201d vs. \u201cS\u201d<\/strong><\/p>\n<p>In both the 49CFR and the TP14850, there are very clear instructions on how to properly mark a UN rated packaging. For example, in the 49CFR 178.503 (a)(5)(ii), it says for packagings intended to contain solids or inner packagings, the letter \u201cS\u201d must appear in the UN specification marking. Similarly, the TP14850 at 5.3.5.1 says that the letter \u201cS\u201d must not be marked on a container unless a representative prototype of the container was successfully tested in accordance with chapter 7 with solids, viscous liquids or inner packagings.\u00a0 This means that if a combination UN packaging is tested, with inner packagings (such as bottles) and an outer packaging (such as a 4G box), that the UN specification code must include the letter \u201cS\u201d because the combination packaging contains inner packagings. For example, the UN specification marking for a combination 4G box tested with inner packaging should look like below.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-882430\" src=\"https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2024\/07\/ICC_SvsS_Blog_07-2024-1.png\" alt=\"\" width=\"341\" height=\"226\" srcset=\"https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2024\/07\/ICC_SvsS_Blog_07-2024-1.png 341w, https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2024\/07\/ICC_SvsS_Blog_07-2024-1-300x199.png 300w, https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2024\/07\/ICC_SvsS_Blog_07-2024-1-91x60.png 91w, https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2024\/07\/ICC_SvsS_Blog_07-2024-1-136x90.png 136w\" sizes=\"auto, (max-width: 341px) 100vw, 341px\" \/>In this case the UN packaging referenced above was tested with liquids inside of plastic bottles which go inside of an outer 4G box.<\/p>\n<p>Now on the other hand, if a single packaging such as a stand-alone drum is tested with solids, it will also have an \u201cS\u201d in the UN marking. In the example below, you have an open head steel drum that was UN tested with solid material. In this case you will also see a max gross weight in KG in the marking instead of a maximum specific gravity and the hydrostatic pressure test result that is required for single packagings tested with liquids.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-882429\" src=\"https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2024\/07\/ICC_SvsS_Blog_07-2024-2.png\" alt=\"\" width=\"441\" height=\"276\" srcset=\"https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2024\/07\/ICC_SvsS_Blog_07-2024-2.png 441w, https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2024\/07\/ICC_SvsS_Blog_07-2024-2-300x188.png 300w, https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2024\/07\/ICC_SvsS_Blog_07-2024-2-96x60.png 96w, https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2024\/07\/ICC_SvsS_Blog_07-2024-2-144x90.png 144w\" sizes=\"auto, (max-width: 441px) 100vw, 441px\" \/><\/p>\n<p>I suppose it is also possible that a drum can be UN tested with inner containers inside as a combination packaging, and that would also have an \u201cS\u201d in the UN marking. But the only way to be sure is to see the UN test certificate and closing instructions.<\/p>\n<p>Do you have questions about UN Packaging? Take a look at our\u00a0<a href=\"https:\/\/www.thecompliancecenter.com\/ca\/un-performance-packaging-faq\/\" target=\"_blank\" rel=\"noopener\">UN Packaging FAQ<\/a>\u00a0or contact our team of experts at 855.734.5469 or\u00a0<a href=\"https:\/\/www.thecompliancecenter.com\/ca\/general-information-request\/\" target=\"_blank\" rel=\"noopener\">send us an email<\/a>, we\u2019re happy to help.<\/p>\n<h3><strong><a href=\"https:\/\/www.thecompliancecenter.com\/ca\/newsletter-signup\/\" target=\"_blank\" rel=\"noopener\">Stay up to date and sign up for our newsletter!<\/a><\/strong><\/h3>\n<p><em><strong>We have all the products, services and training you need to ensure your staff is properly trained and informed.<\/strong><\/em><\/p>\n<table>\n<tbody>\n<tr>\n<td style=\"text-align: center\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-thumbnail wp-image-206482\" src=\"https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2019\/11\/ICC_Packaging_Custom-150x150.png\" alt=\"\" width=\"150\" height=\"150\" srcset=\"https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2019\/11\/ICC_Packaging_Custom-150x150.png 150w, https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2019\/11\/ICC_Packaging_Custom-300x300.png 300w, https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2019\/11\/ICC_Packaging_Custom-100x100.png 100w, https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2019\/11\/ICC_Packaging_Custom-140x140.png 140w, https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2019\/11\/ICC_Packaging_Custom-500x500.png 500w, https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2019\/11\/ICC_Packaging_Custom-350x350.png 350w, https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2019\/11\/ICC_Packaging_Custom.png 601w, https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2019\/11\/ICC_Packaging_Custom-600x600.png 600w, https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2019\/11\/ICC_Packaging_Custom-64x64.png 64w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><a href=\"https:\/\/www.thecompliancecenter.com\/ca\/services\/packaging-testing\/\" target=\"_blank\" rel=\"noopener\"><span class=\"TextRun SCXW224331726 BCX0\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"none\"><span class=\"NormalTextRun SCXW224331726 BCX0\" data-ccp-parastyle=\"heading 2\">Custom<br \/>\nPackaging Design<\/span><\/span><span class=\"EOP SCXW224331726 BCX0\" data-ccp-props=\"{&quot;134245418&quot;:true,&quot;134245529&quot;:true,&quot;201341983&quot;:0,&quot;335559738&quot;:40,&quot;335559739&quot;:0,&quot;335559740&quot;:259}\">\u00a0<\/span><\/a><\/td>\n<td style=\"text-align: center\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-thumbnail wp-image-857616\" src=\"https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2021\/06\/BX-17SPA-1-150x150.png\" alt=\"UN 4G Airbag Box - 16x11.25x9\" width=\"150\" height=\"150\" srcset=\"https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2021\/06\/BX-17SPA-1-150x150.png 150w, https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2021\/06\/BX-17SPA-1-300x300.png 300w, https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2021\/06\/BX-17SPA-1-100x100.png 100w, https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2021\/06\/BX-17SPA-1-140x140.png 140w, https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2021\/06\/BX-17SPA-1-60x60.png 60w, https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2021\/06\/BX-17SPA-1-90x90.png 90w, https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2021\/06\/BX-17SPA-1-64x64.png 64w, https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2021\/06\/BX-17SPA-1.png 325w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><a href=\"https:\/\/www.thecompliancecenter.com\/ca\/product\/bx-17spa\/\" target=\"_blank\" rel=\"noopener\"><span class=\"TextRun SCXW67329845 BCX0\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"none\"><span class=\"NormalTextRun SCXW67329845 BCX0\" data-ccp-parastyle=\"heading 1\">4G UN Lithium<br \/>\nBattery Box<\/span><\/span><\/a><\/td>\n<td style=\"text-align: center\"><img loading=\"lazy\" decoding=\"async\" class=\"size-thumbnail wp-image-734739 aligncenter\" src=\"https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2021\/03\/pcbt10l-150x150.jpg\" alt=\"\" width=\"150\" height=\"150\" srcset=\"https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2021\/03\/pcbt10l-150x150.jpg 150w, https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2021\/03\/pcbt10l-300x300.jpg 300w, https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2021\/03\/pcbt10l-100x100.jpg 100w, https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2021\/03\/pcbt10l-140x140.jpg 140w, https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2021\/03\/pcbt10l-60x60.jpg 60w, https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2021\/03\/pcbt10l-90x90.jpg 90w, https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2021\/03\/pcbt10l-64x64.jpg 64w, https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2021\/03\/pcbt10l.jpg 325w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><a href=\"https:\/\/www.thecompliancecenter.com\/ca\/product\/pc-bt10l\/\" target=\"_blank\" rel=\"noopener\">Jerrican<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"<p>UN Specification Marking: \u201cS\u201d vs \u201cS\u201d If you use UN packaging, I\u2019m sure you are aware of the UN Specification&#8230;<\/p>\n","protected":false},"author":12562,"featured_media":882393,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","footnotes":""},"categories":[2402,2413,2661,3047,4008,5069,5073,5074,5083],"tags":[2362,2364,2366,2368,2429,2443,2496,2574,2612],"class_list":["post-882428","post","type-post","status-publish","format-standard","has-post-thumbnail","category-safety-2","category-tdg-regulation-updates","category-49-cfr-regulation-updates","category-packaging-updates","category-ground-road-and-rail-transport","category-ground-transportation","category-dot-49-cfr","category-tdgr","category-batteries","tag-dangerous-goods","tag-hazmat","tag-tdg","tag-49-cfr","tag-regulations","tag-safety","tag-shipping","tag-hazardous-materials","tag-un-packaging"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - 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It may not be as straight forward as you would think.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.thecompliancecenter.com\/ca\/help-center\/articles\/un-specification-marking-s-vs-s\/\" \/>\n<meta property=\"og:site_name\" content=\"ICC Compliance Center Inc - Canada\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/compliancecenter\" \/>\n<meta property=\"article:published_time\" content=\"2024-07-02T12:00:02+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-09-05T11:06:46+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.thecompliancecenter.com\/ca\/wp-content\/uploads\/sites\/4\/2024\/06\/ICC_SvsS_June2024_Blog.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1000\" \/>\n\t<meta property=\"og:image:height\" content=\"300\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Michael Zendano\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@ICC_Compliance\" \/>\n<meta name=\"twitter:site\" content=\"@ICC_Compliance\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Michael Zendano\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.thecompliancecenter.com\\\/ca\\\/help-center\\\/articles\\\/un-specification-marking-s-vs-s\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.thecompliancecenter.com\\\/ca\\\/help-center\\\/articles\\\/un-specification-marking-s-vs-s\\\/\"},\"author\":{\"name\":\"Michael Zendano\",\"@id\":\"https:\\\/\\\/www.thecompliancecenter.com\\\/ca\\\/#\\\/schema\\\/person\\\/4b77ba12419e498bb93aca1b9e71049d\"},\"headline\":\"UN Specification Marking: \u201cS\u201d vs \u201cS\u201d\",\"datePublished\":\"2024-07-02T12:00:02+00:00\",\"dateModified\":\"2025-09-05T11:06:46+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.thecompliancecenter.com\\\/ca\\\/help-center\\\/articles\\\/un-specification-marking-s-vs-s\\\/\"},\"wordCount\":490,\"publisher\":{\"@id\":\"https:\\\/\\\/www.thecompliancecenter.com\\\/ca\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.thecompliancecenter.com\\\/ca\\\/help-center\\\/articles\\\/un-specification-marking-s-vs-s\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.thecompliancecenter.com\\\/ca\\\/wp-content\\\/uploads\\\/sites\\\/4\\\/2024\\\/06\\\/ICC_SvsS_June2024_Blog.png\",\"keywords\":[\"dangerous goods\",\"hazmat\",\"TDG\",\"49 CFR\",\"Regulations\",\"safety\",\"shipping\",\"hazardous materials\",\"UN packaging\"],\"articleSection\":[\"Safety\",\"Transportation of Dangerous Goods\",\"49 CFR\",\"UN Packaging\",\"Ground (road and rail) Transport\",\"Ground Transportation\",\"DOT 49 CFR\",\"TDGR\",\"Batteries\"],\"inLanguage\":\"en-CA\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.thecompliancecenter.com\\\/ca\\\/help-center\\\/articles\\\/un-specification-marking-s-vs-s\\\/\",\"url\":\"https:\\\/\\\/www.thecompliancecenter.com\\\/ca\\\/help-center\\\/articles\\\/un-specification-marking-s-vs-s\\\/\",\"name\":\"UN Specification Marking: \u201cS\u201d vs \u201cS\u201d | ICC\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.thecompliancecenter.com\\\/ca\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.thecompliancecenter.com\\\/ca\\\/help-center\\\/articles\\\/un-specification-marking-s-vs-s\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.thecompliancecenter.com\\\/ca\\\/help-center\\\/articles\\\/un-specification-marking-s-vs-s\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.thecompliancecenter.com\\\/ca\\\/wp-content\\\/uploads\\\/sites\\\/4\\\/2024\\\/06\\\/ICC_SvsS_June2024_Blog.png\",\"datePublished\":\"2024-07-02T12:00:02+00:00\",\"dateModified\":\"2025-09-05T11:06:46+00:00\",\"description\":\"What does it mean if your UN packaging has an \u201cS\u201d printed on it? 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