{"id":2359,"date":"2025-07-22T20:52:06","date_gmt":"2025-07-22T20:52:06","guid":{"rendered":"https:\/\/live-discover-restek.pantheonsite.io\/?p=2359"},"modified":"2026-04-02T14:38:08","modified_gmt":"2026-04-02T14:38:08","slug":"can-my-gas-standard-be-recertified","status":"publish","type":"post","link":"https:\/\/discover.restek.com\/zh-hans\/faq\/gnot5004\/can-my-gas-standard-be-recertified","title":{"rendered":"Can my gas standard be recertified?"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Recertification is available for gas standards. Gas standards can be expensive and tend to be stored in the lab for months, if not years, so it is wise to have the composition recertified by a qualified vendor. For gas standards purchased from Restek, request recertification directly from Linde Gases (1-800-932-0624) or Airgas (1-800-331-4953). For gas standards purchased from vendors other than Restek, it is necessary to contact the vendor who manufactured the mixture.<\/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-column2359_ce8b07-25 > .kt-inside-inner-col,.kadence-column2359_ce8b07-25 > .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-column2359_ce8b07-25 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column2359_ce8b07-25 > .kt-inside-inner-col{flex-direction:column;}.kadence-column2359_ce8b07-25 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column2359_ce8b07-25 > .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-column2359_ce8b07-25 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column2359_ce8b07-25{position:relative;}.kadence-column2359_ce8b07-25, .kt-inside-inner-col > .kadence-column2359_ce8b07-25:not(.specificity){margin-top:65px;margin-bottom:10px;}@media all and (max-width: 1024px){.kadence-column2359_ce8b07-25 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column2359_ce8b07-25 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column2359_ce8b07-25 kvs-md-false kvs-sm-false hub-guttered-centered-container\"><div class=\"kt-inside-inner-col\"><style>.kb-row-layout-id2359_afd830-6f > .kt-row-column-wrap{align-content:start;}:where(.kb-row-layout-id2359_afd830-6f > .kt-row-column-wrap) > .wp-block-kadence-column{justify-content:start;}.kb-row-layout-id2359_afd830-6f > .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-id2359_afd830-6f > .kt-row-layout-overlay{opacity:0.30;}@media all and (max-width: 1024px){.kb-row-layout-id2359_afd830-6f > .kt-row-column-wrap{grid-template-columns:minmax(0, 1fr);}}@media all and (max-width: 767px){.kb-row-layout-id2359_afd830-6f > .kt-row-column-wrap{grid-template-columns:minmax(0, 1fr);}}<\/style><div class=\"kb-row-layout-wrap kb-row-layout-id2359_afd830-6f 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-column2359_41416d-de > .kt-inside-inner-col{display:flex;}.kadence-column2359_41416d-de > .kt-inside-inner-col{padding-top:12px;padding-bottom:12px;padding-left:30px;}.kadence-column2359_41416d-de > .kt-inside-inner-col,.kadence-column2359_41416d-de > .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-column2359_41416d-de > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column2359_41416d-de > .kt-inside-inner-col{flex-direction:column;justify-content:center;align-items:flex-start;}.kadence-column2359_41416d-de > .kt-inside-inner-col > .kb-image-is-ratio-size{align-self:stretch;}.kadence-column2359_41416d-de > .kt-inside-inner-col > .wp-block-kadence-advancedgallery{align-self:stretch;}.kadence-column2359_41416d-de > .kt-inside-inner-col > .aligncenter{width:100%;}.kt-row-column-wrap > .kadence-column2359_41416d-de{align-self:center;}.kt-inner-column-height-full:not(.kt-has-1-columns) > .wp-block-kadence-column.kadence-column2359_41416d-de{align-self:auto;}.kt-inner-column-height-full:not(.kt-has-1-columns) > .wp-block-kadence-column.kadence-column2359_41416d-de > .kt-inside-inner-col{flex-direction:column;justify-content:center;}.kadence-column2359_41416d-de > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column2359_41416d-de{position:relative;}.kadence-column2359_41416d-de, .kt-inside-inner-col > .kadence-column2359_41416d-de: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-column2359_41416d-de{align-self:center;}}@media all and (max-width: 1024px){.kt-inner-column-height-full:not(.kt-has-1-columns) > .wp-block-kadence-column.kadence-column2359_41416d-de{align-self:auto;}}@media all and (max-width: 1024px){.kt-inner-column-height-full:not(.kt-has-1-columns) > .wp-block-kadence-column.kadence-column2359_41416d-de > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 1024px){.kadence-column2359_41416d-de > .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-column2359_41416d-de{align-self:center;}.kt-inner-column-height-full:not(.kt-has-1-columns) > .wp-block-kadence-column.kadence-column2359_41416d-de{align-self:auto;}.kt-inner-column-height-full:not(.kt-has-1-columns) > .wp-block-kadence-column.kadence-column2359_41416d-de > .kt-inside-inner-col{flex-direction:column;justify-content:center;}.kadence-column2359_41416d-de > .kt-inside-inner-col{flex-direction:column;justify-content:center;align-items:flex-start;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column2359_41416d-de kb-section-dir-vertical\"><div class=\"kt-inside-inner-col\"><style>.wp-block-kadence-advancedheading.kt-adv-heading2359_5fd869-bc, .wp-block-kadence-advancedheading.kt-adv-heading2359_5fd869-bc[data-kb-block=\"kb-adv-heading2359_5fd869-bc\"]{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-heading2359_5fd869-bc mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading2359_5fd869-bc[data-kb-block=\"kb-adv-heading2359_5fd869-bc\"] 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-heading2359_5fd869-bc img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading2359_5fd869-bc[data-kb-block=\"kb-adv-heading2359_5fd869-bc\"] img.kb-inline-image{width:150px;vertical-align:baseline;}@media all and (max-width: 767px){.wp-block-kadence-advancedheading.kt-adv-heading2359_5fd869-bc, .wp-block-kadence-advancedheading.kt-adv-heading2359_5fd869-bc[data-kb-block=\"kb-adv-heading2359_5fd869-bc\"]{font-size:36px;}}<\/style>\n<h2 class=\"kt-adv-heading2359_5fd869-bc wp-block-kadence-advancedheading has-theme-palette-9-color has-text-color\" data-kb-block=\"kb-adv-heading2359_5fd869-bc\"><strong>Find Reference Standards Fast<\/strong><\/h2>\n\n\n<style>.wp-block-kadence-advancedheading.kt-adv-heading2359_74ff72-06, .wp-block-kadence-advancedheading.kt-adv-heading2359_74ff72-06[data-kb-block=\"kb-adv-heading2359_74ff72-06\"]{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-heading2359_74ff72-06 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading2359_74ff72-06[data-kb-block=\"kb-adv-heading2359_74ff72-06\"] 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-heading2359_74ff72-06 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading2359_74ff72-06[data-kb-block=\"kb-adv-heading2359_74ff72-06\"] img.kb-inline-image{width:150px;vertical-align:baseline;}@media all and (max-width: 767px){.wp-block-kadence-advancedheading.kt-adv-heading2359_74ff72-06, .wp-block-kadence-advancedheading.kt-adv-heading2359_74ff72-06[data-kb-block=\"kb-adv-heading2359_74ff72-06\"]{font-size:36px;}}<\/style>\n<h2 class=\"kt-adv-heading2359_74ff72-06 wp-block-kadence-advancedheading has-theme-palette-9-color has-text-color\" data-kb-block=\"kb-adv-heading2359_74ff72-06\"><em>Access the <strong>NEW<\/strong>&nbsp;Reference Standards Finder today.<\/em><\/h2>\n\n\n<style>.wp-block-kadence-advancedbtn.kt-btns2359_a051d3-a6, .site .entry-content .wp-block-kadence-advancedbtn.kt-btns2359_a051d3-a6, .wp-block-kadence-advancedbtn.kb-btns2359_a051d3-a6, .site .entry-content .wp-block-kadence-advancedbtn.kb-btns2359_a051d3-a6{margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;}.wp-block-kadence-advancedbtn.kb-btns2359_a051d3-a6{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-btns2359_a051d3-a6 .kt-button{font-weight:normal;font-style:normal;}.kt-btns2359_a051d3-a6 .kt-btn-wrap-0{margin-right:5px;}.wp-block-kadence-advancedbtn.kt-btns2359_a051d3-a6 .kt-btn-wrap-0 .kt-button{color:#555555;border-color:#555555;}.wp-block-kadence-advancedbtn.kt-btns2359_a051d3-a6 .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns2359_a051d3-a6 .kt-btn-wrap-0 .kt-button:focus{color:#ffffff;border-color:#444444;}.wp-block-kadence-advancedbtn.kt-btns2359_a051d3-a6 .kt-btn-wrap-0 .kt-button::before{display:none;}.wp-block-kadence-advancedbtn.kt-btns2359_a051d3-a6 .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns2359_a051d3-a6 .kt-btn-wrap-0 .kt-button:focus{background:#444444;}<\/style>\n<div class=\"wp-block-kadence-advancedbtn kb-buttons-wrap kb-btns2359_a051d3-a6\"><style>ul.menu .wp-block-kadence-advancedbtn .kb-btn2359_8088ce-53.kb-button{width:initial;}.wp-block-kadence-advancedbtn .kb-btn2359_8088ce-53.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-btn2359_8088ce-53.kb-button .kb-svg-icon-wrap{font-size:16px;--kb-button-icon-size:16px;}.wp-block-kadence-advancedbtn .kb-btn2359_8088ce-53.kb-button:hover, .wp-block-kadence-advancedbtn .kb-btn2359_8088ce-53.kb-button:focus{color:#0c115b;background:var(--global-palette9, #ffffff);}@media all and (max-width: 1024px){.wp-block-kadence-advancedbtn .kb-btn2359_8088ce-53.kb-button{border-top:0px solid #1b3f73;border-right:0px solid #1b3f73;border-bottom:0px solid #1b3f73;border-left:0px solid #1b3f73;}}@media all and (max-width: 767px){.wp-block-kadence-advancedbtn .kb-btn2359_8088ce-53.kb-button{border-top:0px solid #1b3f73;border-right:0px solid #1b3f73;border-bottom:0px solid #1b3f73;border-left:0px solid #1b3f73;}}<\/style><a class=\"kb-button kt-button button kb-btn2359_8088ce-53 kt-btn-size-standard kt-btn-width-type-auto kb-btn-global-outline kt-btn-has-text-true kt-btn-has-svg-true wp-block-kadence-singlebtn\" href=\"https:\/\/tools.restek.com\/\" target=\"_blank\" rel=\"noreferrer noopener\"><span 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-column2359_a3973b-af > .kt-inside-inner-col{display:flex;}.kadence-column2359_a3973b-af > .kt-inside-inner-col{padding-top:20px;padding-right:20px;padding-bottom:20px;padding-left:20px;}.kadence-column2359_a3973b-af > .kt-inside-inner-col,.kadence-column2359_a3973b-af > .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-column2359_a3973b-af > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column2359_a3973b-af > .kt-inside-inner-col{flex-direction:column;justify-content:center;align-items:center;}.kadence-column2359_a3973b-af > .kt-inside-inner-col > .kb-image-is-ratio-size{align-self:stretch;}.kadence-column2359_a3973b-af > .kt-inside-inner-col > .wp-block-kadence-advancedgallery{align-self:stretch;}.kadence-column2359_a3973b-af > .kt-inside-inner-col > .aligncenter{width:100%;}.kt-row-column-wrap > .kadence-column2359_a3973b-af{align-self:center;}.kt-inner-column-height-full:not(.kt-has-1-columns) > .wp-block-kadence-column.kadence-column2359_a3973b-af{align-self:auto;}.kt-inner-column-height-full:not(.kt-has-1-columns) > .wp-block-kadence-column.kadence-column2359_a3973b-af > .kt-inside-inner-col{flex-direction:column;justify-content:center;}.kadence-column2359_a3973b-af > .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-column2359_a3973b-af > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column2359_a3973b-af{position:relative;}.kadence-column2359_a3973b-af, .kt-inside-inner-col > .kadence-column2359_a3973b-af:not(.specificity){margin-top:45px;margin-bottom:10px;}@media all and (max-width: 1024px){.kadence-column2359_a3973b-af > .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-column2359_a3973b-af{align-self:center;}}@media all and (max-width: 1024px){.kt-inner-column-height-full:not(.kt-has-1-columns) > .wp-block-kadence-column.kadence-column2359_a3973b-af{align-self:auto;}}@media all and (max-width: 1024px){.kt-inner-column-height-full:not(.kt-has-1-columns) > .wp-block-kadence-column.kadence-column2359_a3973b-af > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column2359_a3973b-af > .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;}.kt-row-column-wrap > .kadence-column2359_a3973b-af{align-self:center;}.kt-inner-column-height-full:not(.kt-has-1-columns) > .wp-block-kadence-column.kadence-column2359_a3973b-af{align-self:auto;}.kt-inner-column-height-full:not(.kt-has-1-columns) > .wp-block-kadence-column.kadence-column2359_a3973b-af > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column2359_a3973b-af kvs-lg-false hub-guttered-centered-container\"><div class=\"kt-inside-inner-col\"><style>.wp-block-kadence-advancedheading.kt-adv-heading2359_1baaa9-11, .wp-block-kadence-advancedheading.kt-adv-heading2359_1baaa9-11[data-kb-block=\"kb-adv-heading2359_1baaa9-11\"]{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-heading2359_1baaa9-11 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading2359_1baaa9-11[data-kb-block=\"kb-adv-heading2359_1baaa9-11\"] 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-heading2359_1baaa9-11 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading2359_1baaa9-11[data-kb-block=\"kb-adv-heading2359_1baaa9-11\"] img.kb-inline-image{width:150px;vertical-align:baseline;}@media all and (max-width: 1024px){.wp-block-kadence-advancedheading.kt-adv-heading2359_1baaa9-11, .wp-block-kadence-advancedheading.kt-adv-heading2359_1baaa9-11[data-kb-block=\"kb-adv-heading2359_1baaa9-11\"]{margin-top:480px;font-size:48px;}}@media all and (max-width: 767px){.wp-block-kadence-advancedheading.kt-adv-heading2359_1baaa9-11, .wp-block-kadence-advancedheading.kt-adv-heading2359_1baaa9-11[data-kb-block=\"kb-adv-heading2359_1baaa9-11\"]{margin-top:300px;font-size:40px;line-height:42px;}}<\/style>\n<h2 class=\"kt-adv-heading2359_1baaa9-11 wp-block-kadence-advancedheading has-theme-palette-9-color has-text-color\" data-kb-block=\"kb-adv-heading2359_1baaa9-11\"><strong>Find Reference Standards Fast<\/strong><\/h2>\n\n\n<style>.wp-block-kadence-advancedheading.kt-adv-heading2359_aed37c-34, .wp-block-kadence-advancedheading.kt-adv-heading2359_aed37c-34[data-kb-block=\"kb-adv-heading2359_aed37c-34\"]{text-align:center;font-size:22px;line-height:22px;font-weight:400;font-style:normal;font-family:Inter;text-transform:none;}.wp-block-kadence-advancedheading.kt-adv-heading2359_aed37c-34 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading2359_aed37c-34[data-kb-block=\"kb-adv-heading2359_aed37c-34\"] 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-heading2359_aed37c-34 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading2359_aed37c-34[data-kb-block=\"kb-adv-heading2359_aed37c-34\"] img.kb-inline-image{width:150px;vertical-align:baseline;}@media all and (max-width: 1024px){.wp-block-kadence-advancedheading.kt-adv-heading2359_aed37c-34, .wp-block-kadence-advancedheading.kt-adv-heading2359_aed37c-34[data-kb-block=\"kb-adv-heading2359_aed37c-34\"]{margin-top:20px;margin-bottom:20px;line-height:38px;border-top:1px solid #0087ce;border-right:1px solid #0087ce;border-bottom:1px solid #0087ce;border-left:1px solid #0087ce;}}@media all and (max-width: 767px){.wp-block-kadence-advancedheading.kt-adv-heading2359_aed37c-34, .wp-block-kadence-advancedheading.kt-adv-heading2359_aed37c-34[data-kb-block=\"kb-adv-heading2359_aed37c-34\"]{margin-top:20px;margin-bottom:20px;font-size:24px;line-height:30px;border-top:1px solid #0087ce;border-right:1px solid #0087ce;border-bottom:1px solid #0087ce;border-left:1px solid #0087ce;}}<\/style>\n<h2 class=\"kt-adv-heading2359_aed37c-34 wp-block-kadence-advancedheading has-theme-palette-9-color has-text-color\" data-kb-block=\"kb-adv-heading2359_aed37c-34\"><em>Access the <strong>NEW<\/strong>&nbsp;Reference Standards Finder today.<\/em><\/h2>\n\n\n<style>.wp-block-kadence-advancedbtn.kb-btns2359_66b585-b7{gap:var(--global-kb-gap-xs, 0.5rem );justify-content:center;align-items:center;}.kt-btns2359_66b585-b7 .kt-button{font-weight:normal;font-style:normal;}.kt-btns2359_66b585-b7 .kt-btn-wrap-0{margin-right:5px;}.wp-block-kadence-advancedbtn.kt-btns2359_66b585-b7 .kt-btn-wrap-0 .kt-button{color:#555555;border-color:#555555;}.wp-block-kadence-advancedbtn.kt-btns2359_66b585-b7 .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns2359_66b585-b7 .kt-btn-wrap-0 .kt-button:focus{color:#ffffff;border-color:#444444;}.wp-block-kadence-advancedbtn.kt-btns2359_66b585-b7 .kt-btn-wrap-0 .kt-button::before{display:none;}.wp-block-kadence-advancedbtn.kt-btns2359_66b585-b7 .kt-btn-wrap-0 .kt-button:hover, .wp-block-kadence-advancedbtn.kt-btns2359_66b585-b7 .kt-btn-wrap-0 .kt-button:focus{background:#444444;}@media all and (max-width: 1024px){.wp-block-kadence-advancedbtn.kt-btns2359_66b585-b7, .site 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Gas standards can be expensive and tend to be stored in the lab for months, if not years, so it is wise to have the composition recertified by a qualified vendor. For gas standards purchased from Restek, request recertification directly from Linde Gases (1-800-932-0624) or Airgas (1-800-331-4953). 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