{"id":1777,"date":"2025-07-16T19:14:24","date_gmt":"2025-07-16T19:14:24","guid":{"rendered":"https:\/\/live-discover-restek.pantheonsite.io\/?p=1777"},"modified":"2026-09-17T17:51:52","modified_gmt":"2026-09-17T17:51:52","slug":"how-do-i-know-whether-the-reference-standard-i-purchased-from-restek-is-a-certified-reference-material-crm-as-defined-by-iso","status":"publish","type":"post","link":"https:\/\/discover.restek.com\/es\/faq\/gnot4941\/how-do-i-know-whether-the-reference-standard-i-purchased-from-restek-is-a-certified-reference-material-crm-as-defined-by-iso","title":{"rendered":"How do I know whether the reference standard I purchased from Restek is a certified reference material (CRM) as defined by ISO?"},"content":{"rendered":"\n<ul class=\"wp-block-list\">\n<li><strong>Before you purchase<\/strong>, you can check at&nbsp;<a href=\"https:\/\/discover.restek.com\/iso-quality-credentials\/\">www.restek.com\/iso<\/a>&nbsp;to see if your standard falls within our scope of accreditation. You can also ask&nbsp;<a href=\"https:\/\/www.restek.com\/contact-us\" target=\"_blank\" rel=\"noreferrer noopener\">Restek Customer Service<\/a>&nbsp;or your&nbsp;<a href=\"https:\/\/discover.restek.com\/find-your-distributor\/\">local Restek representative<\/a>.<\/li>\n\n\n\n<li><strong>After you purchase<\/strong>, you can easily confirm that your standard is a CRM by looking at your certificate of analysis (CofA). For a standard to be considered a CRM, it must be both manufactured and tested in an ISO-accredited lab. Every certified reference material we sell will have A2LA\/ILAC logos in the upper right-hand corner of its CofA, signifying that it was both manufactured and tested under our ISO 17034 and ISO\/IEC 17025 accreditations. The CofA will also state &#8220;Certified Reference Material&#8221; at the top.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"876\" src=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNOT3397B-02-1024x876.jpg\" alt=\"Different versions of ISO logos.\" class=\"wp-image-22234\" style=\"width:500px\" title=\"-\" srcset=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNOT3397B-02-1024x876.jpg 1024w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNOT3397B-02-300x257.jpg 300w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNOT3397B-02-768x657.jpg 768w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNOT3397B-02-1536x1313.jpg 1536w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-GNOT3397B-02.jpg 1800w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">Please note that our gas reference standards are not within our scope of accreditation, so they are not certified reference materials (CRMs).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Find our full selection of reference standards <a href=\"https:\/\/www.restek.com\/c\/1102\" target=\"_blank\" rel=\"noopener\">here.<\/a><\/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-column1777_32e2d2-a1 > .kt-inside-inner-col,.kadence-column1777_32e2d2-a1 > .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-column1777_32e2d2-a1 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column1777_32e2d2-a1 > 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.kt-inside-inner-col > .aligncenter{width:100%;}.kt-row-column-wrap > .kadence-column1777_623e5c-85{align-self:center;}.kt-inner-column-height-full:not(.kt-has-1-columns) > .wp-block-kadence-column.kadence-column1777_623e5c-85{align-self:auto;}.kt-inner-column-height-full:not(.kt-has-1-columns) > .wp-block-kadence-column.kadence-column1777_623e5c-85 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}.kadence-column1777_623e5c-85 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column1777_623e5c-85{position:relative;}.kadence-column1777_623e5c-85, .kt-inside-inner-col > .kadence-column1777_623e5c-85: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-column1777_623e5c-85{align-self:center;}}@media all and (max-width: 1024px){.kt-inner-column-height-full:not(.kt-has-1-columns) > .wp-block-kadence-column.kadence-column1777_623e5c-85{align-self:auto;}}@media all and (max-width: 1024px){.kt-inner-column-height-full:not(.kt-has-1-columns) > .wp-block-kadence-column.kadence-column1777_623e5c-85 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 1024px){.kadence-column1777_623e5c-85 > .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-column1777_623e5c-85{align-self:center;}.kt-inner-column-height-full:not(.kt-has-1-columns) > .wp-block-kadence-column.kadence-column1777_623e5c-85{align-self:auto;}.kt-inner-column-height-full:not(.kt-has-1-columns) > .wp-block-kadence-column.kadence-column1777_623e5c-85 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}.kadence-column1777_623e5c-85 > .kt-inside-inner-col{flex-direction:column;justify-content:center;align-items:flex-start;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column1777_623e5c-85 kb-section-dir-vertical\"><div class=\"kt-inside-inner-col\"><style>.wp-block-kadence-advancedheading.kt-adv-heading1777_06a232-7b, .wp-block-kadence-advancedheading.kt-adv-heading1777_06a232-7b[data-kb-block=\"kb-adv-heading1777_06a232-7b\"]{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-heading1777_06a232-7b mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading1777_06a232-7b[data-kb-block=\"kb-adv-heading1777_06a232-7b\"] 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-heading1777_06a232-7b img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading1777_06a232-7b[data-kb-block=\"kb-adv-heading1777_06a232-7b\"] img.kb-inline-image{width:150px;vertical-align:baseline;}@media all and (max-width: 767px){.wp-block-kadence-advancedheading.kt-adv-heading1777_06a232-7b, .wp-block-kadence-advancedheading.kt-adv-heading1777_06a232-7b[data-kb-block=\"kb-adv-heading1777_06a232-7b\"]{font-size:36px;}}<\/style>\n<h2 class=\"kt-adv-heading1777_06a232-7b wp-block-kadence-advancedheading has-theme-palette-9-color has-text-color\" data-kb-block=\"kb-adv-heading1777_06a232-7b\"><strong>Find Reference Standards Fast<\/strong><\/h2>\n\n\n<style>.wp-block-kadence-advancedheading.kt-adv-heading1777_50404a-c9, 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767px){.wp-block-kadence-advancedheading.kt-adv-heading1777_50404a-c9, .wp-block-kadence-advancedheading.kt-adv-heading1777_50404a-c9[data-kb-block=\"kb-adv-heading1777_50404a-c9\"]{font-size:36px;}}<\/style>\n<h2 class=\"kt-adv-heading1777_50404a-c9 wp-block-kadence-advancedheading has-theme-palette-9-color has-text-color\" data-kb-block=\"kb-adv-heading1777_50404a-c9\"><em>Access the <strong>NEW<\/strong>&nbsp;Reference Standards Finder today.<\/em><\/h2>\n\n\n<style>.wp-block-kadence-advancedbtn.kt-btns1777_c474ff-15, .site .entry-content .wp-block-kadence-advancedbtn.kt-btns1777_c474ff-15, .wp-block-kadence-advancedbtn.kb-btns1777_c474ff-15, .site .entry-content .wp-block-kadence-advancedbtn.kb-btns1777_c474ff-15{margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;}.wp-block-kadence-advancedbtn.kb-btns1777_c474ff-15{padding-top:var(--global-kb-spacing-xs, 1rem);padding-right:0px;gap:var(--global-kb-gap-xs, 0.5rem 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19\"\/><\/svg><\/span><\/a><\/div>\n<\/div><\/div>\n\n<\/div><\/div><\/div><\/div>\n\n\n<style>.kadence-column1777_afbb2d-9c > .kt-inside-inner-col{display:flex;}.kadence-column1777_afbb2d-9c > .kt-inside-inner-col{padding-top:20px;padding-right:20px;padding-bottom:20px;padding-left:20px;}.kadence-column1777_afbb2d-9c > .kt-inside-inner-col,.kadence-column1777_afbb2d-9c > .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-column1777_afbb2d-9c > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column1777_afbb2d-9c > .kt-inside-inner-col{flex-direction:column;justify-content:center;align-items:center;}.kadence-column1777_afbb2d-9c > .kt-inside-inner-col > .kb-image-is-ratio-size{align-self:stretch;}.kadence-column1777_afbb2d-9c > .kt-inside-inner-col > .wp-block-kadence-advancedgallery{align-self:stretch;}.kadence-column1777_afbb2d-9c > .kt-inside-inner-col > 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1024px){.kadence-column1777_afbb2d-9c > .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-column1777_afbb2d-9c{align-self:center;}}@media all and (max-width: 1024px){.kt-inner-column-height-full:not(.kt-has-1-columns) > .wp-block-kadence-column.kadence-column1777_afbb2d-9c{align-self:auto;}}@media all and (max-width: 1024px){.kt-inner-column-height-full:not(.kt-has-1-columns) > .wp-block-kadence-column.kadence-column1777_afbb2d-9c > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column1777_afbb2d-9c > .kt-inside-inner-col{border-top:1px solid #0087ce;border-right:1px solid #0087ce;border-bottom:1px solid #0087ce;border-left:1px solid 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