{"id":1784,"date":"2025-07-16T19:24:25","date_gmt":"2025-07-16T19:24:25","guid":{"rendered":"https:\/\/live-discover-restek.pantheonsite.io\/?p=1784"},"modified":"2026-04-08T19:23:12","modified_gmt":"2026-04-08T19:23:12","slug":"is-my-pfas-standard-linear-or-branched","status":"publish","type":"post","link":"https:\/\/discover.restek.com\/es\/faq\/gnot4955\/is-my-pfas-standard-linear-or-branched","title":{"rendered":"Is my PFAS standard linear or branched?"},"content":{"rendered":"\n<p>Several legacy PFAS compounds are found as a mixture of branched isomers in the environment. Restek utilizes &#8220;br&#8221; to represent &#8220;branched&#8221; for legacy PFAS compounds. A compound denoted as &#8220;br&#8221; means at least 10% of its isomeric composition is nonlinear.<\/p>\n\n\n\n<p>Example of linear and branched PFOS:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"144\" src=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNOT4955-01-1024x144.png\" alt=\"\" class=\"wp-image-71625\" title=\"-\" srcset=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNOT4955-01-1024x144.png 1024w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNOT4955-01-300x42.png 300w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNOT4955-01-768x108.png 768w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNOT4955-01-1536x216.png 1536w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNOT4955-01-2048x287.png 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>We do not add a designation to non-legacy PFAS compounds. These compounds are linear only unless otherwise noted.<\/p>\n\n\n\n<div class=\"wp-block-group hub-fullwidth-container\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\"><style>.kadence-column1784_ea0ffd-b2 > .kt-inside-inner-col,.kadence-column1784_ea0ffd-b2 > .kt-inside-inner-col:before{border-top-left-radius:16px;border-top-right-radius:16px;border-bottom-right-radius:16px;border-bottom-left-radius:16px;}.kadence-column1784_ea0ffd-b2 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column1784_ea0ffd-b2 > .kt-inside-inner-col{flex-direction:column;}.kadence-column1784_ea0ffd-b2 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column1784_ea0ffd-b2 > .kt-inside-inner-col{background-image:url('https:\/\/discover.restek.com\/wp-content\/uploads\/standards-finder-footer-ad-desktop.jpg');background-size:cover 100%;background-position:74% 54%;background-attachment:scroll;background-repeat:no-repeat;}.kadence-column1784_ea0ffd-b2 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column1784_ea0ffd-b2{position:relative;}.kadence-column1784_ea0ffd-b2, .kt-inside-inner-col > .kadence-column1784_ea0ffd-b2:not(.specificity){margin-top:65px;margin-bottom:10px;}@media all and (max-width: 1024px){.kadence-column1784_ea0ffd-b2 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column1784_ea0ffd-b2 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column1784_ea0ffd-b2 kvs-md-false kvs-sm-false hub-guttered-centered-container\"><div class=\"kt-inside-inner-col\"><style>.kb-row-layout-id1784_ddc6bb-9a > .kt-row-column-wrap{align-content:start;}:where(.kb-row-layout-id1784_ddc6bb-9a > .kt-row-column-wrap) > .wp-block-kadence-column{justify-content:start;}.kb-row-layout-id1784_ddc6bb-9a > .kt-row-column-wrap{column-gap:var(--global-kb-gap-md, 2rem);row-gap:var(--global-kb-gap-md, 2rem);padding-right:var(--global-kb-spacing-5xl, 10rem);grid-template-columns:minmax(0, 1fr);}.kb-row-layout-id1784_ddc6bb-9a > .kt-row-layout-overlay{opacity:0.30;}@media all and (max-width: 1024px){.kb-row-layout-id1784_ddc6bb-9a > .kt-row-column-wrap{grid-template-columns:minmax(0, 1fr);}}@media all and (max-width: 767px){.kb-row-layout-id1784_ddc6bb-9a > .kt-row-column-wrap{grid-template-columns:minmax(0, 1fr);}}<\/style><div class=\"kb-row-layout-wrap kb-row-layout-id1784_ddc6bb-9a alignnone wp-block-kadence-rowlayout\"><div class=\"kt-row-column-wrap kt-has-1-columns kt-row-layout-equal kt-tab-layout-inherit kt-mobile-layout-row kt-row-valign-top\">\n<style>.kadence-column1784_50a486-1f > .kt-inside-inner-col{display:flex;}.kadence-column1784_50a486-1f > .kt-inside-inner-col{padding-top:12px;padding-bottom:12px;padding-left:30px;}.kadence-column1784_50a486-1f > .kt-inside-inner-col,.kadence-column1784_50a486-1f > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column1784_50a486-1f > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column1784_50a486-1f > .kt-inside-inner-col{flex-direction:column;justify-content:center;align-items:flex-start;}.kadence-column1784_50a486-1f > .kt-inside-inner-col > .kb-image-is-ratio-size{align-self:stretch;}.kadence-column1784_50a486-1f > .kt-inside-inner-col > .wp-block-kadence-advancedgallery{align-self:stretch;}.kadence-column1784_50a486-1f > .kt-inside-inner-col > .aligncenter{width:100%;}.kt-row-column-wrap > .kadence-column1784_50a486-1f{align-self:center;}.kt-inner-column-height-full:not(.kt-has-1-columns) > .wp-block-kadence-column.kadence-column1784_50a486-1f{align-self:auto;}.kt-inner-column-height-full:not(.kt-has-1-columns) > .wp-block-kadence-column.kadence-column1784_50a486-1f > .kt-inside-inner-col{flex-direction:column;justify-content:center;}.kadence-column1784_50a486-1f > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column1784_50a486-1f{position:relative;}.kadence-column1784_50a486-1f, .kt-inside-inner-col > .kadence-column1784_50a486-1f:not(.specificity){margin-top:var(--global-kb-spacing-xs, 1rem);margin-bottom:var(--global-kb-spacing-xs, 1rem);}@media all and (max-width: 1024px){.kt-row-column-wrap > .kadence-column1784_50a486-1f{align-self:center;}}@media all and (max-width: 1024px){.kt-inner-column-height-full:not(.kt-has-1-columns) > .wp-block-kadence-column.kadence-column1784_50a486-1f{align-self:auto;}}@media all and (max-width: 1024px){.kt-inner-column-height-full:not(.kt-has-1-columns) > .wp-block-kadence-column.kadence-column1784_50a486-1f > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 1024px){.kadence-column1784_50a486-1f > .kt-inside-inner-col{flex-direction:column;justify-content:center;align-items:flex-start;}}@media all and (max-width: 767px){.kt-row-column-wrap > .kadence-column1784_50a486-1f{align-self:center;}.kt-inner-column-height-full:not(.kt-has-1-columns) > .wp-block-kadence-column.kadence-column1784_50a486-1f{align-self:auto;}.kt-inner-column-height-full:not(.kt-has-1-columns) > .wp-block-kadence-column.kadence-column1784_50a486-1f > .kt-inside-inner-col{flex-direction:column;justify-content:center;}.kadence-column1784_50a486-1f > .kt-inside-inner-col{flex-direction:column;justify-content:center;align-items:flex-start;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column1784_50a486-1f kb-section-dir-vertical\"><div class=\"kt-inside-inner-col\"><style>.wp-block-kadence-advancedheading.kt-adv-heading1784_7a881f-ab, .wp-block-kadence-advancedheading.kt-adv-heading1784_7a881f-ab[data-kb-block=\"kb-adv-heading1784_7a881f-ab\"]{padding-right:0px;padding-left:0px;text-align:left;font-size:40px;font-weight:400;font-style:normal;font-family:Inter;text-transform:none;}.wp-block-kadence-advancedheading.kt-adv-heading1784_7a881f-ab mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading1784_7a881f-ab[data-kb-block=\"kb-adv-heading1784_7a881f-ab\"] mark.kt-highlight{font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.wp-block-kadence-advancedheading.kt-adv-heading1784_7a881f-ab img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading1784_7a881f-ab[data-kb-block=\"kb-adv-heading1784_7a881f-ab\"] img.kb-inline-image{width:150px;vertical-align:baseline;}@media all and (max-width: 767px){.wp-block-kadence-advancedheading.kt-adv-heading1784_7a881f-ab, .wp-block-kadence-advancedheading.kt-adv-heading1784_7a881f-ab[data-kb-block=\"kb-adv-heading1784_7a881f-ab\"]{font-size:36px;}}<\/style>\n<h2 class=\"kt-adv-heading1784_7a881f-ab wp-block-kadence-advancedheading has-theme-palette-9-color has-text-color\" data-kb-block=\"kb-adv-heading1784_7a881f-ab\"><strong>Find Reference Standards Fast<\/strong><\/h2>\n\n\n<style>.wp-block-kadence-advancedheading.kt-adv-heading1784_1db85c-fd, .wp-block-kadence-advancedheading.kt-adv-heading1784_1db85c-fd[data-kb-block=\"kb-adv-heading1784_1db85c-fd\"]{padding-right:0px;padding-left:0px;margin-top:10px;margin-bottom:10px;text-align:left;font-size:26px;font-weight:400;font-style:normal;font-family:Inter;text-transform:none;}.wp-block-kadence-advancedheading.kt-adv-heading1784_1db85c-fd mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading1784_1db85c-fd[data-kb-block=\"kb-adv-heading1784_1db85c-fd\"] mark.kt-highlight{font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.wp-block-kadence-advancedheading.kt-adv-heading1784_1db85c-fd img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading1784_1db85c-fd[data-kb-block=\"kb-adv-heading1784_1db85c-fd\"] img.kb-inline-image{width:150px;vertical-align:baseline;}@media all and (max-width: 767px){.wp-block-kadence-advancedheading.kt-adv-heading1784_1db85c-fd, .wp-block-kadence-advancedheading.kt-adv-heading1784_1db85c-fd[data-kb-block=\"kb-adv-heading1784_1db85c-fd\"]{font-size:36px;}}<\/style>\n<h2 class=\"kt-adv-heading1784_1db85c-fd wp-block-kadence-advancedheading has-theme-palette-9-color has-text-color\" data-kb-block=\"kb-adv-heading1784_1db85c-fd\"><em>Access the <strong>NEW<\/strong>&nbsp;Reference Standards Finder today.<\/em><\/h2>\n\n\n<style>.wp-block-kadence-advancedbtn.kt-btns1784_c3dae9-52, .site .entry-content .wp-block-kadence-advancedbtn.kt-btns1784_c3dae9-52, .wp-block-kadence-advancedbtn.kb-btns1784_c3dae9-52, .site .entry-content .wp-block-kadence-advancedbtn.kb-btns1784_c3dae9-52{margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;}.wp-block-kadence-advancedbtn.kb-btns1784_c3dae9-52{padding-top:var(--global-kb-spacing-xs, 1rem);padding-right:0px;gap:var(--global-kb-gap-xs, 0.5rem );justify-content:center;align-items:center;}.kt-btns1784_c3dae9-52 .kt-button{font-weight:normal;font-style:normal;}.kt-btns1784_c3dae9-52 .kt-btn-wrap-0{margin-right:5px;}.wp-block-kadence-advancedbtn.kt-btns1784_c3dae9-52 .kt-btn-wrap-0 .kt-button{color:#555555;border-color:#555555;}.wp-block-kadence-advancedbtn.kt-btns1784_c3dae9-52 .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns1784_c3dae9-52 .kt-btn-wrap-0 .kt-button:focus{color:#ffffff;border-color:#444444;}.wp-block-kadence-advancedbtn.kt-btns1784_c3dae9-52 .kt-btn-wrap-0 .kt-button::before{display:none;}.wp-block-kadence-advancedbtn.kt-btns1784_c3dae9-52 .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns1784_c3dae9-52 .kt-btn-wrap-0 .kt-button:focus{background:#444444;}<\/style>\n<div class=\"wp-block-kadence-advancedbtn kb-buttons-wrap kb-btns1784_c3dae9-52\"><style>ul.menu .wp-block-kadence-advancedbtn .kb-btn1784_9fe158-68.kb-button{width:initial;}.wp-block-kadence-advancedbtn .kb-btn1784_9fe158-68.kb-button{color:var(--global-palette9, #ffffff);background:#1b3f73;font-size:24px;line-height:20px;font-family:'Open Sans';font-weight:600;border-top-left-radius:8px;border-top-right-radius:8px;border-bottom-right-radius:8px;border-bottom-left-radius:8px;border-top:0px solid #1b3f73;border-right:0px solid #1b3f73;border-bottom:0px solid #1b3f73;border-left:0px solid #1b3f73;padding-top:12px;padding-right:100px;padding-bottom:12px;padding-left:100px;}.kb-btn1784_9fe158-68.kb-button 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class=\"kt-btn-inner-text\">START YOUR SEARCH<\/span><span class=\"kb-svg-icon-wrap kb-svg-icon-fe_arrowRight kt-btn-icon-side-right\"><svg viewBox=\"0 0 24 24\"  fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><line x1=\"5\" y1=\"12\" x2=\"19\" y2=\"12\"\/><polyline points=\"12 5 19 12 12 19\"\/><\/svg><\/span><\/a><\/div>\n<\/div><\/div>\n\n<\/div><\/div><\/div><\/div>\n\n\n<style>.kadence-column1784_9e368e-02 > .kt-inside-inner-col{display:flex;}.kadence-column1784_9e368e-02 > .kt-inside-inner-col{padding-top:20px;padding-right:20px;padding-bottom:20px;padding-left:20px;}.kadence-column1784_9e368e-02 > .kt-inside-inner-col,.kadence-column1784_9e368e-02 > .kt-inside-inner-col:before{border-top-left-radius:16px;border-top-right-radius:16px;border-bottom-right-radius:16px;border-bottom-left-radius:16px;}.kadence-column1784_9e368e-02 > 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.kt-inside-inner-col{background-color:#0087ce;background-image:url('https:\/\/discover.restek.com\/wp-content\/uploads\/standards-finder-footer-ad-mobile.jpg');background-size:cover;background-position:50% 0%;background-attachment:scroll;background-repeat:no-repeat;}.kadence-column1784_9e368e-02 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column1784_9e368e-02{position:relative;}.kadence-column1784_9e368e-02, .kt-inside-inner-col > .kadence-column1784_9e368e-02:not(.specificity){margin-top:45px;margin-bottom:10px;}@media all and (max-width: 1024px){.kadence-column1784_9e368e-02 > .kt-inside-inner-col{border-top:1px solid #0087ce;border-right:1px solid #0087ce;border-bottom:1px solid #0087ce;border-left:1px solid #0087ce;flex-direction:column;justify-content:center;align-items:center;}}@media all and (max-width: 1024px){.kt-row-column-wrap > .kadence-column1784_9e368e-02{align-self:center;}}@media all and (max-width: 1024px){.kt-inner-column-height-full:not(.kt-has-1-columns) > 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kadence-column1784_9e368e-02 kvs-lg-false hub-guttered-centered-container\"><div class=\"kt-inside-inner-col\"><style>.wp-block-kadence-advancedheading.kt-adv-heading1784_126a29-28, .wp-block-kadence-advancedheading.kt-adv-heading1784_126a29-28[data-kb-block=\"kb-adv-heading1784_126a29-28\"]{text-align:center;font-size:26px;line-height:26px;font-weight:400;font-style:normal;font-family:Inter;text-transform:none;}.wp-block-kadence-advancedheading.kt-adv-heading1784_126a29-28 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading1784_126a29-28[data-kb-block=\"kb-adv-heading1784_126a29-28\"] mark.kt-highlight{font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.wp-block-kadence-advancedheading.kt-adv-heading1784_126a29-28 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading1784_126a29-28[data-kb-block=\"kb-adv-heading1784_126a29-28\"] img.kb-inline-image{width:150px;vertical-align:baseline;}@media all and (max-width: 1024px){.wp-block-kadence-advancedheading.kt-adv-heading1784_126a29-28, .wp-block-kadence-advancedheading.kt-adv-heading1784_126a29-28[data-kb-block=\"kb-adv-heading1784_126a29-28\"]{margin-top:480px;font-size:48px;}}@media all and (max-width: 767px){.wp-block-kadence-advancedheading.kt-adv-heading1784_126a29-28, .wp-block-kadence-advancedheading.kt-adv-heading1784_126a29-28[data-kb-block=\"kb-adv-heading1784_126a29-28\"]{margin-top:300px;font-size:40px;line-height:42px;}}<\/style>\n<h2 class=\"kt-adv-heading1784_126a29-28 wp-block-kadence-advancedheading has-theme-palette-9-color has-text-color\" data-kb-block=\"kb-adv-heading1784_126a29-28\"><strong>Find Reference Standards Fast<\/strong><\/h2>\n\n\n<style>.wp-block-kadence-advancedheading.kt-adv-heading1784_2dd561-f7, 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Restek utilizes &#8220;br&#8221; to represent &#8220;branched&#8221; for legacy PFAS compounds. A compound denoted as &#8220;br&#8221; means at least 10% of its isomeric composition is nonlinear. Example of linear and branched PFOS: We do not add a designation to non-legacy PFAS&#8230;<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_kadence_starter_templates_imported_post":false,"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"footnotes":""},"categories":[23],"tags":[2674,2687,2782],"industries-application":[2212],"post-badge":[],"resource-type":[],"product-library":[],"resource-technique":[],"hf_cat_post":[625],"ppma_author":[414],"class_list":["post-1784","post","type-post","status-publish","format-standard","hentry","category-faq","tag-faq-pfas-standards","tag-faq-reference-standards","tag-pfas","industries-application-analyse-de-pfas"],"acf":[],"taxonomy_info":{"category":[{"value":23,"label":"FAQ"}],"post_tag":[{"value":2674,"label":"FAQ: 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