{"id":2936,"date":"2026-07-20T16:07:02","date_gmt":"2026-07-20T14:07:02","guid":{"rendered":"https:\/\/gekkophotonics.com\/epoxy-reactive-resins\/chemistry\/"},"modified":"2026-07-20T16:07:02","modified_gmt":"2026-07-20T14:07:02","slug":"chemistry","status":"publish","type":"page","link":"https:\/\/gekkophotonics.com\/en\/epoxy-reactive-resins\/epoxy-isocyanate-reactive-resins-raman\/","title":{"rendered":"Epoxy, Isocyanate &amp; Reactive Resins \u2013 NCO%, EEW Inline Raman | Gekko Photonics"},"content":{"rendered":"<style>.elementor-2936 .elementor-element.elementor-element-7e83700{margin-top:0px;margin-bottom:0px;padding:0px 0px 0px 0px;}.elementor-2936 .elementor-element.elementor-element-383f157 > .elementor-element-populated{padding:0px 0px 0px 0px;}@media(min-width:768px){.elementor-2936 .elementor-element.elementor-element-383f157{width:100%;}}<\/style>\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"2936\" class=\"elementor elementor-2936 elementor-bc-flex-widget\" 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auto;padding:0 24px}\n#gkms .hero .display{color:#fff;max-width:17ch}\n#gkms .hero .display .accent{color:var(--gk-blue-400)}\n#gkms .hero .lead{color:#C8D0DC;max-width:56ch;margin-top:22px}\n#gkms .hero .eyebrow{color:var(--gk-blue-400)}\n#gkms .hero .eyebrow::before{background:var(--gk-blue-400)}\n#gkms .badges{display:flex;flex-wrap:wrap;gap:10px;margin:26px 0 32px}\n#gkms .badge{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;padding:8px 15px;border-radius:var(--r-pill);background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.16);color:#DCE4EF}\n#gkms .badge b{color:#fff;font-weight:800}\n#gkms .hero-cta{display:flex;flex-wrap:wrap;gap:12px}\n#gkms .scrollcue{position:absolute;left:50%;bottom:26px;transform:translateX(-50%);color:rgba(255,255,255,.5);font-size:22px;animation:bob 1.8s var(--ease) infinite}\n@keyframes bob{0%,100%{transform:translate(-50%,0)}50%{transform:translate(-50%,8px)}}\n\n\/* ---- generic reveal ---- *\/\n#gkms 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img{width:100%;height:100%;object-fit:cover}\n\n\/* ---- analyte + spectrum explorer ---- *\/\n#gkms .explorer{display:grid;grid-template-columns:1fr 1.15fr;gap:40px;align-items:stretch}\n@media(max-width:900px){#gkms .explorer{grid-template-columns:1fr}}\n#gkms .analyte-list{display:flex;flex-direction:column;gap:10px}\n#gkms .analyte{display:flex;justify-content:space-between;align-items:center;gap:14px;text-align:left;font-family:var(--font);\n  background:#fff;border:1px solid var(--g200);border-radius:var(--r-md);padding:16px 18px;cursor:pointer;transition:.18s var(--ease)}\n#gkms .analyte:hover{border-color:var(--gk-blue-400);transform:translateX(3px)}\n#gkms .analyte.active{border-color:var(--gk-blue);background:var(--gk-blue-50);box-shadow:var(--sh-sm)}\n#gkms .analyte .n{font-weight:700;color:var(--gk-navy-deep);font-size:15px}\n#gkms .analyte .band{font-size:12px;font-weight:700;color:var(--gk-blue);font-variant-numeric:tabular-nums;background:var(--gk-blue-100);padding:3px 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auto;width:46px;height:46px;border-radius:12px;background:var(--gk-blue-50);color:var(--gk-blue);display:flex;align-items:center;justify-content:center;font-size:22px}\n#gkms .how-point h4{font-size:18px;color:var(--gk-navy-deep);margin-bottom:5px}\n#gkms .how-point p{font-size:15px;color:var(--gk-slate);line-height:1.55}\n\n\/* ---- metric band ---- *\/\n#gkms .band{background:linear-gradient(120deg,#141F30 0%,var(--gk-navy-dark) 55%,#1B3048 100%);color:#fff;position:relative;overflow:hidden}\n#gkms .band::before{content:\"\";position:absolute;inset:0;pointer-events:none;\n  background-image:linear-gradient(rgba(255,255,255,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.035) 1px,transparent 1px);\n  background-size:56px 56px;mask-image:radial-gradient(70rem 40rem at 30% 0%,#000 0%,transparent 70%)}\n#gkms .band .wrap{position:relative}\n#gkms .band .metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:32px}\n@media(max-width:820px){#gkms .band 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.25s var(--ease);display:flex;flex-direction:column}\n#gkms .proof:hover{box-shadow:var(--sh-lg);transform:translateY(-4px);border-color:var(--gk-blue-100)}\n#gkms .proof .pph{aspect-ratio:16\/10;background:var(--g100);overflow:hidden;position:relative}\n#gkms .proof .pph img{width:100%;height:100%;object-fit:cover;transition:transform .55s var(--ease)}\n#gkms .proof:hover .pph img{transform:scale(1.045)}\n#gkms .proof .pph .ptag{position:absolute;left:14px;top:14px;font-size:10.5px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:#fff;background:rgba(15,22,38,.72);backdrop-filter:blur(6px);padding:6px 11px;border-radius:var(--r-pill)}\n#gkms .proof .pbody{padding:24px 24px 26px;display:flex;flex-direction:column;flex:1}\n#gkms .proof h4{color:var(--gk-navy-deep);font-size:18px;line-height:1.25;margin:0 0 12px}\n#gkms .proof p{font-size:14px;color:var(--gk-slate);line-height:1.62}\n#gkms .proof p b{color:var(--gk-navy-deep);font-variant-numeric:tabular-nums}\n\n\/* ---- duel ---- *\/\n#gkms .duel{background:#fff;border:1px solid var(--g100);border-radius:var(--r-lg);overflow:hidden;box-shadow:var(--sh-md)}\n#gkms .duel-row{display:grid;grid-template-columns:1fr 1.15fr;align-items:stretch}\n#gkms .duel-row .mid{display:none}\n#gkms .duel-row .old,#gkms .duel-row .new{padding:18px 28px;font-size:15px;display:flex;align-items:center}\n#gkms .duel-row .old{color:var(--g500);background:var(--g50);border-bottom:1px solid var(--g100)}\n#gkms .duel-row .new{color:var(--gk-navy-deep);font-weight:600;background:var(--gk-blue-50);border-bottom:1px solid rgba(1,159,226,.14);border-left:2px solid var(--gk-blue)}\n#gkms .duel-row:last-child .old{border-bottom:none}\n#gkms .duel-row:last-child .new{border-bottom:none}\n#gkms .duel-row.duel-head .old,#gkms .duel-row.duel-head .new{font-weight:800;text-transform:uppercase;font-size:12px;letter-spacing:.1em;padding-top:20px;padding-bottom:20px}\n#gkms .duel-row.duel-head .old{background:var(--g100);color:var(--g500)}\n#gkms .duel-row.duel-head .new{background:var(--gk-navy-deep);color:#fff;border-bottom:none;border-left-color:var(--gk-navy-deep)}\n#gkms .duel .ck{color:var(--gk-blue);font-weight:800;margin-right:10px}\n#gkms .duel .xk{color:var(--g300);font-weight:800;margin-right:10px}\n@media(max-width:720px){#gkms .duel-row{grid-template-columns:1fr}#gkms .duel-row .old{border-bottom:1px dashed var(--g200)}}\n\n\/* ---- compliance ---- *\/\n#gkms .reg-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}\n@media(max-width:820px){#gkms .reg-grid{grid-template-columns:1fr}}\n#gkms .reg{background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.1);border-radius:var(--r-lg);padding:24px}\n#gkms .reg .flag{display:inline-block;font-size:11px;font-weight:800;letter-spacing:.06em;padding:5px 11px;border-radius:6px;background:var(--gk-blue);color:#fff;text-transform:uppercase;margin-bottom:14px}\n#gkms .reg h4{font-size:17px;color:#fff;margin-bottom:6px}\n#gkms .reg p{font-size:14px;color:#C8D0DC;line-height:1.55}\n\n\/* ---- replace ---- *\/\n#gkms .repl{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}\n@media(max-width:720px){#gkms .repl{grid-template-columns:1fr}}\n#gkms .repl .item{display:flex;gap:14px;align-items:flex-start;background:#fff;border:1px solid var(--g100);border-radius:var(--r-md);padding:18px 20px}\n#gkms .repl .lag{flex:0 0 auto;font-size:12px;font-weight:800;color:var(--bad);background:#FDE9E9;padding:5px 10px;border-radius:6px;white-space:nowrap}\n#gkms .repl .m{font-weight:700;color:var(--gk-navy-deep);font-size:15px}\n#gkms .repl .s{font-size:13px;color:var(--gk-slate);margin-top:3px}\n\n\/* ---- product ---- *\/\n#gkms .product{display:grid;grid-template-columns:.95fr 1.05fr;gap:48px;align-items:center}\n@media(max-width:900px){#gkms .product{grid-template-columns:1fr}}\n#gkms .prod-photo{background:radial-gradient(60% 55% at 50% 42%,#101321 0%,#010105 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100%);color:#fff;border-radius:var(--r-xl);padding:64px 48px;text-align:center;position:relative;overflow:hidden}\n#gkms .cta::after{content:\"\";position:absolute;inset:0;background:radial-gradient(40rem 20rem at 80% 120%,rgba(243,201,105,.18),transparent 60%);pointer-events:none}\n#gkms .cta .h2{color:#fff;max-width:20ch;margin:14px auto 0;position:relative}\n#gkms .cta p{color:rgba(255,255,255,.92);max-width:58ch;margin:16px auto 0;position:relative;font-size:17px;line-height:1.6}\n#gkms .cta .hero-cta{justify-content:center;margin-top:30px;position:relative}\n#gkms .cta .sub{margin-top:18px;font-size:13px;color:rgba(255,255,255,.82);position:relative}\n\n\/* ---- workshop strip (secondary, demoted) ---- *\/\n#gkms .strip{background:var(--gk-off);border-top:1px solid var(--g100);border-bottom:1px solid var(--g100)}\n#gkms .strip-in{display:flex;flex-wrap:wrap;gap:20px;align-items:center;justify-content:space-between;padding:34px 0}\n#gkms .strip .st-l{display:flex;align-items:center;gap:16px}\n#gkms .strip .st-ic{width:48px;height:48px;border-radius:12px;background:var(--gk-blue-50);color:var(--gk-blue);display:flex;align-items:center;justify-content:center;font-size:24px;flex:0 0 auto}\n#gkms .strip h4{font-size:18px;color:var(--gk-navy-deep)}\n#gkms .strip p{font-size:14px;color:var(--gk-slate);margin-top:2px}\n\n\/* ---- footer ---- *\/\n#gkms .foot{background:var(--black);color:#C8D0DC;padding:72px 0 30px}\n#gkms .foot-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.1fr;gap:36px}\n@media(max-width:820px){#gkms .foot-grid{grid-template-columns:1fr 1fr}}\n#gkms .foot .flogo{height:42px;width:auto;filter:brightness(0) invert(1);margin-bottom:18px}\n#gkms .foot .ftag{font-size:14px;color:#8A93A0;line-height:1.6;max-width:34ch}\n#gkms .foot h5{font-size:11px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--gk-blue);margin-bottom:16px}\n#gkms .foot a{display:block;font-size:13px;color:#C8D0DC;line-height:2}\n#gkms .foot a:hover{color:var(--gk-blue-400)}\n#gkms .foot .addr{font-size:13px;color:#8A93A0;line-height:1.7;margin-top:4px}\n#gkms .foot .fbottom{display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;align-items:center;margin-top:52px;padding-top:24px;border-top:1px solid rgba(255,255,255,.08);font-size:12px;color:#5E6676}\n#gkms .foot .fbottom .tagpl{color:var(--gk-blue);font-weight:700;letter-spacing:.14em;text-transform:uppercase}\n#gkms .mono-note{font-size:12px;color:var(--g400)}\n\n\/* ---- feasibility request form (custom, posts to gekko\/v1\/rsvp) ---- *\/\n#gkms .gkms-form{max-width:560px;margin:28px auto 0;text-align:left;position:relative}\n#gkms .gkms-form-q{font-weight:700;font-size:14px;color:#fff;margin:0 0 12px;text-align:center}\n#gkms .gkms-choices{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:14px}\n#gkms .gkms-opt{display:flex;align-items:center;justify-content:center;text-align:center;gap:8px;padding:13px 10px;border:1.5px solid rgba(255,255,255,.34);border-radius:var(--r-md);background:rgba(255,255,255,.08);color:#fff;font-family:var(--font);font-weight:600;font-size:14px;line-height:1.25;cursor:pointer;transition:.15s var(--ease)}\n#gkms .gkms-opt:hover{border-color:#fff;background:rgba(255,255,255,.16)}\n#gkms .gkms-opt.is-sel{background:#fff;color:var(--gk-navy-deep);border-color:#fff}\n#gkms .gkms-row{display:flex;gap:10px;flex-wrap:wrap}\n#gkms .gkms-email{flex:1 1 240px;min-width:0;padding:14px 15px;height:auto;line-height:1.4;border:1.5px solid rgba(255,255,255,.34);border-radius:var(--r-md);background:rgba(255,255,255,.96);color:var(--gk-navy-deep);font-family:var(--font);font-size:15px}\n#gkms .gkms-email::placeholder{color:var(--g400)}\n#gkms .gkms-email:focus{outline:none;border-color:#fff;box-shadow:0 0 0 3px rgba(255,255,255,.25)}\n#gkms .gkms-submit{flex:0 0 auto;box-shadow:0 6px 18px rgba(13,13,13,.18)}\n#gkms .gkms-hp{position:absolute!important;left:-9999px!important;top:auto;width:1px;height:1px;overflow:hidden;opacity:0}\n#gkms .gkms-consent{display:flex;align-items:flex-start;gap:10px;margin:14px 0 0;font-size:12.5px;color:rgba(255,255,255,.9);line-height:1.5;cursor:pointer;text-align:left}\n#gkms .gkms-consent-cb{flex:none;width:18px;height:18px;margin-top:1px;accent-color:#fff;cursor:pointer}\n#gkms .gkms-consent a{color:#fff;text-decoration:underline}\n#gkms .gkms-req{color:var(--gk-gold)}\n#gkms .gkms-msg{margin:12px 0 0;font-size:14px;min-height:1px;text-align:center;color:#fff}\n#gkms .gkms-msg.err{color:#FFDADA}\n#gkms .gkms-done{max-width:560px;margin:28px auto 0;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.30);border-radius:var(--r-lg);padding:24px;text-align:center;color:#fff;font-size:16px;font-weight:600;line-height:1.5}\n#gkms .cta-alt{margin-top:20px;position:relative}\n#gkms .cta-alt a{color:#fff;font-weight:600;font-size:14px;text-decoration:none;border-bottom:1px solid rgba(255,255,255,.5);padding-bottom:2px}\n#gkms .cta-alt a:hover{border-color:#fff}\n@media(max-width:560px){#gkms .gkms-choices{grid-template-columns:1fr}}\n\n\/* ---- inline line icons (replacing emoji) ---- *\/\n#gkms .ci svg{width:28px;height:28px;display:block;color:#DCE4EF}\n#gkms .cyc-step.on .ci svg{color:#fff}\n#gkms .how-point .hi svg{width:24px;height:24px;display:block}\n#gkms .strip .st-ic svg{width:26px;height:26px;display:block}\n#gkms .gkms-hint{margin:0 0 16px;font-size:13px;color:rgba(255,255,255,.88);line-height:1.55;text-align:center}\n#gkms .gkms-submit{transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease)}\n#gkms .gkms-submit.is-check{background:var(--ok);border-color:var(--ok);color:#fff;pointer-events:none}\n#gkms .gkms-submit svg{width:18px;height:18px;flex:0 0 auto;margin-right:2px}\n\n\n\/* ---- multi-page additions ---- *\/\n#gkms .subhero{position:relative;overflow:hidden;color:#fff;padding:120px 0 72px;\n  background:linear-gradient(115deg,#0F1626 0%,#192A3D 55%,#1F2A4A 100%)}\n#gkms .subhero .spectrum{position:absolute;inset:0;width:100%;height:100%;opacity:.20;pointer-events:none}\n#gkms .subhero .display{color:#fff;max-width:22ch;font-size:clamp(34px,4.4vw,54px)}\n#gkms .subhero .display .accent{color:var(--gk-blue-400)}\n#gkms .subhero .lead{color:#C8D0DC;max-width:62ch;margin-top:18px}\n#gkms .subhero .eyebrow{color:var(--gk-blue-400)}\n#gkms .subhero .eyebrow::before{background:var(--gk-blue-400)}\n#gkms .crumb{font-size:13px;color:#8A93A0;margin-bottom:18px}\n#gkms .crumb a{color:#C8D0DC}\n#gkms .crumb a:hover{color:#fff}\n#gkms .teaser-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:44px}\n#gkms a.teaser{display:flex;flex-direction:column;background:#fff;border:1px solid var(--g100);border-radius:var(--r-lg);overflow:hidden;box-shadow:var(--sh-sm);transition:.2s var(--ease);color:inherit}\n#gkms a.teaser:hover{transform:translateY(-3px);box-shadow:var(--sh-md);border-color:var(--gk-blue-100)}\n#gkms .teaser .tph{height:230px;overflow:hidden}\n#gkms .teaser .tph img{width:100%;height:100%;object-fit:cover}\n#gkms .teaser .tbody{padding:20px 22px 22px}\n#gkms .teaser .tk{font-size:11px;font-weight:800;letter-spacing:.14em;text-transform:uppercase;color:var(--gk-blue);margin-bottom:8px}\n#gkms .teaser h3{font-size:18px;color:var(--gk-navy-deep);margin-bottom:6px}\n#gkms .teaser p{font-size:14px;color:var(--gk-slate);line-height:1.55}\n#gkms .teaser .tgo{margin-top:auto;padding-top:14px;font-size:13.5px;font-weight:700;color:var(--gk-blue)}\n@media(max-width:940px){#gkms .teaser-grid{grid-template-columns:1fr}}\n#gkms .pager{display:flex;justify-content:space-between;gap:14px;max-width:1200px;margin:0 auto;padding:34px 24px}\n#gkms .pager a{display:inline-flex;align-items:center;gap:8px;font-size:14px;font-weight:700;color:var(--gk-navy-deep)}\n#gkms .pager a:hover{color:var(--gk-blue)}\n\/* ---- packshot rule: no frame, no background, full device visible ---- *\/\n#gkms .prod-photo{background:none;border:none;box-shadow:none;padding:0;border-radius:0;overflow:visible}\n#gkms .prod-photo::after{display:none}\n#gkms .prod-photo img{max-height:560px;max-width:100%;width:auto;object-fit:contain}\n#gkms .packshot-stage{background:none;border:0;box-shadow:none;padding:0;text-align:center}\n#gkms .packshot-stage img{max-width:100%;height:auto;max-height:520px;object-fit:contain;filter:drop-shadow(0 24px 42px rgba(25,42,61,.28))}\n#gkms .tabpanel.active:not(:has(img)){grid-template-columns:1fr!important;max-width:840px}\n#gkms .product:not(:has(img)){grid-template-columns:1fr!important;max-width:840px}\n#gkms .how-grid:not(:has(img)):not(:has(.cycle)){grid-template-columns:1fr!important;max-width:840px}\n\/* ---- click-to-load YouTube facade ---- *\/\n#gkms .vid-embed{position:relative;width:100%;aspect-ratio:16\/9;border-radius:var(--r-lg);overflow:hidden;box-shadow:var(--sh-md);background:#0F1626}\n#gkms .vid-embed .yt-facade{display:block;width:100%;height:100%;margin:0;padding:0;border:0;cursor:pointer;background:#0F1626;position:relative}\n#gkms .vid-embed .yt-facade img{width:100%;height:100%;object-fit:cover;display:block}\n#gkms .vid-embed .yt-play{position:absolute;inset:0;display:flex;align-items:center;justify-content:center}\n#gkms .vid-embed .yt-play svg{width:74px;height:auto;filter:drop-shadow(0 6px 16px rgba(0,0,0,.45));transition:transform .18s var(--ease)}\n#gkms .vid-embed .yt-facade:hover .yt-play svg,#gkms .vid-embed .yt-facade:focus-visible .yt-play svg{transform:scale(1.09)}\n#gkms .vid-embed iframe{position:absolute;inset:0;width:100%;height:100%;border:0;display:block}\n\n<\/style>\n\n<div id=\"gkms\">\n<div id=\"gkms-progress\" style=\"position:fixed;top:0;left:0;height:3px;background:var(--gk-blue);width:0;z-index:200\"><\/div>\n<nav class=\"nav\">\n    <div class=\"nav-in\">\n      <a href=\"\/epoxy-reactive-resins\/\"><img decoding=\"async\" class=\"logo\" src=\"https:\/\/gekkophotonics.com\/wp-content\/uploads\/2026\/07\/logo-full-5.png\" alt=\"Gekko Photonics\"><\/a>\n      <div class=\"nav-links\">\n      <a href=\"\/epoxy-reactive-resins\/\">Home<\/a>\n      <a href=\"\/epoxy-reactive-resins\/chemistry\/\" class=\"active\">Chemistry<\/a>\n      <a href=\"\/epoxy-reactive-resins\/what-we-measure\/\">What we measure<\/a>\n      <a href=\"\/epoxy-reactive-resins\/how-it-works\/\">How it works<\/a>\n      <a href=\"\/epoxy-reactive-resins\/proof\/\">Proof<\/a>\n      <a href=\"\/epoxy-reactive-resins\/compliance\/\">Compliance<\/a>\n      <a href=\"\/epoxy-reactive-resins\/instrument\/\">Instrument<\/a>\n      <\/div>\n      <a class=\"btn btn-primary\" href=\"#contact\">Test on your samples<\/a>\n    <\/div>\n  <\/nav>\n<header class=\"subhero\">\n  <svg class=\"spectrum\" viewBox=\"0 0 1200 420\" preserveAspectRatio=\"none\" aria-hidden=\"true\">\n    <path d=\"M0,320 L90,312 L150,290 L195,195 L240,305 L315,292 L375,185 L420,305 L480,262 L540,135 L600,290 L660,276 L720,225 L780,296 L840,282 L900,205 L960,300 L1020,288 L1080,240 L1140,292 L1200,270\" fill=\"none\" stroke=\"#019FE2\" stroke-width=\"2\"><\/path>\n    <path d=\"M0,335 L90,328 L150,318 L195,245 L240,325 L315,312 L375,232 L420,322 L480,292 L540,196 L600,312 L660,300 L720,258 L780,318 L840,305 L900,242 L960,320 L1020,308 L1080,272 L1140,314 L1200,295\" fill=\"none\" stroke=\"#fff\" stroke-width=\"1\" stroke-dasharray=\"4 6\"><\/path>\n  <\/svg>\n  <div class=\"hero-in\" style=\"position:relative\">\n    <div class=\"crumb\"><a href=\"\/epoxy-reactive-resins\/\">Epoxy, isocyanate &amp; reactive resins<\/a> \/ Chemistry<\/div>\n    <span class=\"eyebrow\">Chemistry coverage<\/span>\n    <h1 class=\"display\" style=\"margin-top:16px\">Three reactive-resin chemistries. <span class=\"accent\">One measurement layer.<\/span><\/h1>\n    <p class=\"lead\">Epoxy resins, polyurethane prepolymers and reactive adhesives - the reactive-resin chemistries this mini-site covers, and what Spectrally reads inline, in the reactor itself with no sample drawn, in each of them.<\/p>\n  <\/div>\n<\/header>\n\n<!-- ===== 01 \u00b7 COVERAGE OVERVIEW ===== -->\n<section id=\"coverage\" class=\"ctx\">\n  <div class=\"wrap\">\n    <div class=\"sec-head reveal\">\n      <span class=\"num\">01<\/span>\n      <span class=\"eyebrow\">Coverage<\/span>\n      <h2 class=\"h2\">One measurement layer, from the epoxide endpoint to the isocyanate reactor.<\/h2>\n      <p class=\"lead\">Epoxy resins, polyurethane prepolymers and reactive adhesives run different chemistries, but they share one blind spot: the reactive endpoint that defines the batch comes back from an offline titration or a GC 20 to 40 minutes after a sample leaves the line - and for isocyanates that sample is itself an exposure to TDI or MDI. Spectrally X1 INLINE puts one Raman measurement layer across all of it. An immersion probe reads the medium where it reacts (inline - in the reactor itself, no sample drawn), a chemometric model per matrix turns the spectrum into numbers, and the result - epoxide equivalent weight, NCO%, the R index and cure state - reaches your PLC or DCS in about 5 seconds. The probe stays in the reactor, so no one draws a manual diisocyanate sample.<\/p>\n    <\/div>\n    <div class=\"ctx-grid\">\n      <div class=\"ctx-item reveal\"><div class=\"k\">Endpoint<\/div><div class=\"v\">Epoxy resins<\/div><p>The reaction endpoint is the epoxide equivalent weight (EEW); residual epichlorohydrin, a carcinogenic reactant, is safety-critical and tracked continuously. Both read from the same Raman spectrum.<\/p><\/div>\n      <div class=\"ctx-item reveal\"><div class=\"k\">Safety-critical<\/div><div class=\"v\">PU prepolymers \/ isocyanates<\/div><p>Built from TDI or MDI and a polyol. NCO% reads off the strong, isolated band near 2270 cm&#8315;&sup1; and the R index inline; the urea band near 1630 cm&#8315;&sup1; flags a dry-atmosphere breach. The manual diisocyanate sample is removed.<\/p><\/div>\n      <div class=\"ctx-item reveal\"><div class=\"k\">In-process<\/div><div class=\"v\">Reactive adhesives \/ resins<\/div><p>Reactive hot-melts and adhesives where the cure state has to be confirmed in-process rather than inferred from time and temperature.<\/p><\/div>\n      <div class=\"ctx-item reveal\"><div class=\"k\">Master variable<\/div><div class=\"v\">The reactive endpoint<\/div><p>EEW for epoxy, NCO% and the R index (the NCO\/OH ratio) for prepolymers - measured in the reactor instead of inferred after the batch.<\/p><\/div>\n    <\/div>\n  <\/div>\n<\/section>\n\n<!-- ===== 02 \u00b7 EPOXY ===== -->\n<section id=\"epoxy\">\n  <div class=\"wrap\">\n    <div class=\"sec-head reveal\">\n      <span class=\"num\">02<\/span>\n      <span class=\"eyebrow\">Epoxy &middot; Epoxide equivalent weight<\/span>\n      <h2 class=\"h2\">Epoxy resins: the epoxide endpoint, read live in the reactor.<\/h2>\n      <p class=\"lead\">Epoxy resins are defined by the epoxide equivalent weight (EEW) - the reaction endpoint that fixes cure stoichiometry downstream. Residual epichlorohydrin, a carcinogenic reactant, is the safety-critical residual that has to stay controlled. Both live in the same Raman spectrum, read where the resin reacts.<\/p>\n    <\/div>\n\n    <div class=\"tabpanels reveal\">\n      <div class=\"tabpanel active\">\n        <div>\n          <span class=\"tp-tag\">What Spectrally reads in epoxy<\/span>\n          <h3>From an offline titration to a live epoxide endpoint.<\/h3>\n          <p>EEW today is an offline titration and residual epichlorohydrin a gas-chromatography run - both drawn from the reactor and read at the lab bench, after the reaction has moved on. The probe reads the resin where it forms:<\/p>\n          <ul>\n            <li>Epoxide equivalent weight (EEW), the reaction endpoint, read live in the reactor instead of by an offline titration<\/li>\n            <li>Residual epichlorohydrin, the safety-critical carcinogenic residual, tracked continuously<\/li>\n            <li>The condensation endpoint read from the same spectrum, so the batch stops on a measured value<\/li>\n          <\/ul>\n          <p style=\"margin-top:16px\">Epoxy media film and cure on optical windows, so the self-cleaning probe retracts, rinses and returns between reads to hold the signal through a full campaign. The ATEX \/ IECEx Zone 0 build runs on the 30 mW laser for solvent-bearing reactors.<\/p>\n        <\/div>\n        <div class=\"tp-photo\"><img decoding=\"async\" src=\"https:\/\/gekkophotonics.com\/wp-content\/uploads\/2026\/07\/probe-reactor-line-2.jpg\" alt=\"Spectrally X1 PROBE mounted on an epoxy resin reactor line\"><\/div>\n      <\/div>\n    <\/div>\n\n    <div style=\"margin-top:40px\">\n      <h3 style=\"font-size:20px;color:var(--gk-navy-deep);margin-bottom:16px\">What comes off the epoxy critical path<\/h3>\n      <div class=\"repl\">\n        <div class=\"item reveal\"><span class=\"lag\">offline<\/span><div><div class=\"m\">EEW titration<\/div><div class=\"s\">Manual draw and a lab bench. Read inline instead; the titration becomes a periodic reference.<\/div><\/div><\/div>\n        <div class=\"item reveal\"><span class=\"lag\">GC<\/span><div><div class=\"m\">Residual epichlorohydrin by gas chromatography<\/div><div class=\"s\">The carcinogenic residual, tracked continuously in the same Raman read.<\/div><\/div><\/div>\n        <div class=\"item reveal\"><span class=\"lag\">proxy only<\/span><div><div class=\"m\">Offline viscometry<\/div><div class=\"s\">An indirect read on reaction progress. The endpoint comes straight off the spectrum.<\/div><\/div><\/div>\n        <div class=\"item reveal\"><span class=\"lag\">calculated<\/span><div><div class=\"m\">Endpoint by time and temperature profile<\/div><div class=\"s\">A recipe schedule that never confirms the EEW actually in the reactor.<\/div><\/div><\/div>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/section>\n\n<!-- ===== 03 \u00b7 PU PREPOLYMERS \/ ISOCYANATES ===== -->\n<section id=\"isocyanates\" class=\"ctx\">\n  <div class=\"wrap\">\n    <div class=\"sec-head reveal\">\n      <span class=\"num\">03<\/span>\n      <span class=\"eyebrow\">PU prepolymers &middot; NCO \/ isocyanates<\/span>\n      <h2 class=\"h2\">PU prepolymers: NCO% off an isolated band, and the manual sample gone.<\/h2>\n      <p class=\"lead\">Polyurethane prepolymers are built from TDI or MDI and a polyol - the intermediate for foams, adhesives, elastomers and coatings. The R index (the NCO\/OH ratio) is the critical quality attribute, and the isocyanate NCO band near 2270 cm&#8315;&sup1; is strong and isolated, a near-ideal Raman target.<\/p>\n    <\/div>\n\n    <div class=\"tabpanels reveal\">\n      <div class=\"tabpanel active\">\n        <div>\n          <span class=\"tp-tag\">What Spectrally reads in PU prepolymers<\/span>\n          <h3>NCO% and the R index, read where the diisocyanate would be sampled.<\/h3>\n          <p>NCO% today is a di-n-butylamine titration at 20 to 40 minutes per sample - manual, run in a fume hood by a trained operator, and every draw is an exposure to TDI or MDI. The probe reads the reaction where it runs:<\/p>\n          <ul>\n            <li>NCO% from the strong, isolated Raman band near 2270 cm&#8315;&sup1; - prepolymer drift caught between batches<\/li>\n            <li>The R index (the NCO\/OH ratio), continuously through the reaction<\/li>\n            <li>The urea band near 1630 cm&#8315;&sup1; as a real-time alarm on a breach of the reactor's dry atmosphere<\/li>\n          <\/ul>\n          <p style=\"margin-top:16px\">The probe stays in the reactor 24\/7, so no operator draws a manual TDI or MDI sample - the exposure step is removed, not reduced. Free isocyanate monomer reads inline in the same acquisition instead of waiting on a GC, and the ATEX \/ IECEx Zone 0 build runs on the 30 mW laser.<\/p>\n        <\/div>\n        <div class=\"tp-photo\"><img decoding=\"async\" src=\"https:\/\/gekkophotonics.com\/wp-content\/uploads\/2026\/07\/gen-prepolymer-reactor.jpg\" alt=\"Polyurethane prepolymer reactor with isocyanate feed at a chemical plant\"><\/div>\n      <\/div>\n    <\/div>\n\n    <div class=\"proof-grid\" style=\"margin-top:40px\">\n      <div class=\"proof reveal\">\n        <div class=\"pph\"><span class=\"ptag\">Isocyanate Raman signature<\/span><img decoding=\"async\" src=\"https:\/\/gekkophotonics.com\/wp-content\/uploads\/2026\/07\/probe-resin-line-2.jpg\" alt=\"Spectrally X1 PROBE immersed in a polyurethane prepolymer reaction mixture\"><\/div>\n        <div class=\"pbody\">\n          <h4>NCO read off a near-ideal Raman band<\/h4>\n          <p>The numbers that define a prepolymer batch map onto strong, specific Raman bands - the isocyanate NCO band near <b>2270 cm&#8315;&sup1;<\/b> is one of the cleaner targets in vibrational spectroscopy, so NCO% and the R index read directly and continuously inline, and the urea band near <b>1630 cm&#8315;&sup1;<\/b> flags an atmosphere breach in real time. The feasibility study on your reactor delivers the validated model and the numbers on your matrix.<\/p>\n        <\/div>\n      <\/div>\n      <div class=\"proof reveal\">\n        <div class=\"pph\"><span class=\"ptag\">Safety &middot; operator exposure<\/span><img decoding=\"async\" src=\"https:\/\/gekkophotonics.com\/wp-content\/uploads\/2026\/07\/gen-isocyanate-handling.jpg\" alt=\"Isocyanate drum handling area at a polyurethane production plant\"><\/div>\n        <div class=\"pbody\">\n          <h4>The manual diisocyanate sample, removed<\/h4>\n          <p>A plant takes <b>3 to 8<\/b> manual diisocyanate samples per batch, each an exposure to TDI or MDI - substances with among the lowest occupational limits in the EU, the TDI limit at <b>0.02 mg\/m&sup3;<\/b>. With the probe in the reactor the sampling step is removed entirely, and the same inline record documents composition per batch. An EHS and a compliance win in one.<\/p>\n        <\/div>\n      <\/div>\n      <div class=\"proof reveal\">\n        <div class=\"pph\"><span class=\"ptag\">Reference case - Phenol-formaldehyde resins<\/span><img decoding=\"async\" src=\"https:\/\/gekkophotonics.com\/wp-content\/uploads\/2026\/07\/inline-cabinet-detail-1.jpg\" alt=\"Spectrally X1 INLINE analyzer front panel at a resin plant\"><\/div>\n        <div class=\"pbody\">\n          <h4>A closed loop, documented on the platform<\/h4>\n          <p>On phenol-formaldehyde resins - a reactor chemistry running on the same Spectrally platform - a European producer closed the endpoint loop inline with a self-cleaning reactor probe: roughly <b>6.5 months<\/b> payback, about <b>180,000 EUR<\/b> saved a year, raw-material losses down <b>10%<\/b>, production waste down <b>12%<\/b> and batch-to-batch variability held under <b>1.5%<\/b>. Cited here as the Phenol-formaldehyde resins reference point.<\/p>\n        <\/div>\n      <\/div>\n    <\/div>\n\n    <div style=\"margin-top:40px\">\n      <h3 style=\"font-size:20px;color:var(--gk-navy-deep);margin-bottom:16px\">What comes off the PU \/ isocyanate critical path<\/h3>\n      <div class=\"repl\">\n        <div class=\"item reveal\"><span class=\"lag\">20-40 min<\/span><div><div class=\"m\">Di-n-butylamine NCO titration<\/div><div class=\"s\">Manual, in a fume hood, a TDI\/MDI exposure each time. Read inline; the titration becomes a periodic reference.<\/div><\/div><\/div>\n        <div class=\"item reveal\"><span class=\"lag\">less isolated<\/span><div><div class=\"m\">NIR for NCO<\/div><div class=\"s\">Used for NCO, but a less isolated band than the Raman 2270 cm&#8315;&sup1; target. Raman resolves it directly.<\/div><\/div><\/div>\n        <div class=\"item reveal\"><span class=\"lag\">proxy only<\/span><div><div class=\"m\">Inline viscometer<\/div><div class=\"s\">A reaction-progress proxy with no NCO%. Composition comes off the spectrum.<\/div><\/div><\/div>\n        <div class=\"item reveal\"><span class=\"lag\">GC<\/span><div><div class=\"m\">Residual isocyanate monomer by GC<\/div><div class=\"s\">Free TDI\/MDI monomer, read inline in the same acquisition instead of waiting on a chromatograph.<\/div><\/div><\/div>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/section>\n\n<!-- ===== 04 \u00b7 REACTIVE ADHESIVES ===== -->\n<section id=\"adhesives\">\n  <div class=\"wrap\">\n    <div class=\"sec-head reveal\">\n      <span class=\"num\">04<\/span>\n      <span class=\"eyebrow\">Reactive adhesives &middot; Cure state<\/span>\n      <h2 class=\"h2\">Reactive adhesives: cure confirmed in-process, not inferred.<\/h2>\n      <p class=\"lead\">Reactive hot-melts and adhesives cure by crosslinking, and today that cure is usually inferred from a time and temperature schedule or judged offline once the batch is done. Raman follows the reaction itself, in the reacting medium.<\/p>\n    <\/div>\n\n    <div class=\"tabpanels reveal\">\n      <div class=\"tabpanel active\">\n        <div>\n          <span class=\"tp-tag\">What Spectrally reads in reactive adhesives<\/span>\n          <h3>Cure state read from the spectrum, not from a schedule.<\/h3>\n          <p>The probe reads the crosslinking chemistry where it happens, so the endpoint is a measured value rather than a clock margin:<\/p>\n          <ul>\n            <li>Cure state and crosslinking, confirmed in-process from the reacting bands<\/li>\n            <li>For isocyanate-cured reactive systems, residual NCO followed at the band near 2270 cm&#8315;&sup1;<\/li>\n            <li>The cure endpoint read from the spectrum instead of a time-and-temperature recipe<\/li>\n          <\/ul>\n          <p style=\"margin-top:16px\">The same immersion probe and the same analyzer carry this chemistry - only the chemometric model changes, built and validated on your matrix during feasibility.<\/p>\n        <\/div>\n        <div class=\"tp-photo reveal\"><img decoding=\"async\" src=\"https:\/\/gekkophotonics.com\/wp-content\/uploads\/2026\/07\/gen-reactive-adhesive.jpg\" alt=\"Reactive hot-melt adhesive production line with stainless steel reactors and drum filling\"><\/div>\n      <\/div>\n    <\/div>\n\n    <div style=\"margin-top:40px\">\n      <h3 style=\"font-size:20px;color:var(--gk-navy-deep);margin-bottom:16px\">What comes off the reactive-adhesive critical path<\/h3>\n      <div class=\"repl\">\n        <div class=\"item reveal\"><span class=\"lag\">calculated<\/span><div><div class=\"m\">Cure by time and temperature schedule<\/div><div class=\"s\">A recipe that never confirms the cure state actually reached. Read from the reacting bands instead.<\/div><\/div><\/div>\n        <div class=\"item reveal\"><span class=\"lag\">offline<\/span><div><div class=\"m\">DSC - cure<\/div><div class=\"s\">Thermal analysis on a pulled sample after the fact. Crosslinking followed live in the reactor instead.<\/div><\/div><\/div>\n        <div class=\"item reveal\"><span class=\"lag\">observational<\/span><div><div class=\"m\">Gel-time<\/div><div class=\"s\">A watched, subjective endpoint. Replaced by a measured band-intensity read.<\/div><\/div><\/div>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/section>\n\n<!-- ===== 05 \u00b7 ONE PLATFORM ===== -->\n<section id=\"platform\" class=\"band\">\n  <div class=\"wrap\">\n    <div class=\"sec-head reveal\">\n      <span class=\"num\">05<\/span>\n      <span class=\"eyebrow no-line\" style=\"color:var(--gk-blue-400)\">One layer, one platform<\/span>\n      <h2 class=\"h2\" style=\"color:#fff;margin-top:12px\">Three chemistries. The same instrument, the same workflow.<\/h2>\n      <p class=\"lead\" style=\"color:#C8D0DC\">Every reactor above is measured by the same platform: a Spectrally X1 PROBE in the vessel, the Spectrally X1 INLINE analyzer up to 100 m away by fiber, and Spectrally OS turning spectra into process values over PROFIBUS and PROFINET. What changes per chemistry is the chemometric model - built and validated on your matrix during the feasibility study.<\/p>\n    <\/div>\n    <div class=\"reg-grid\">\n      <div class=\"reg reveal\"><span class=\"flag\">Hardware<\/span><h4>One probe family across resins<\/h4><p>316L immersion probe, IP67, ATEX \/ IECEx Zone 0 versions on the 30 mW laser, up to 16 bar, -40 to +125 &deg;C, pH 2-10 continuous. Reactive resins film and cure on optics, so the self-cleaning module retracts and rinses the window between reads - a genuine strength on this family.<\/p><\/div>\n      <div class=\"reg reveal\"><span class=\"flag\">Models<\/span><h4>A dedicated model per matrix<\/h4><p>AI \/ advanced chemometrics with a CNN core in Spectrally OS, trained on your recipes against laboratory reference values - the benchmark it is measured against is PLS \/ PCA. The isolated NCO band near 2270 cm&#8315;&sup1; is a near-ideal target, and models update without stopping the line.<\/p><\/div>\n      <div class=\"reg reveal\"><span class=\"flag\">Integration<\/span><h4>Values, not spectra, in the control room<\/h4><p>NCO%, the R index, EEW and cure state arrive as ordinary process tags over PROFIBUS \/ PROFINET. Every measurement is stored and exportable - CSV, PDF or raw spectra - as a per-batch record for the EHS and compliance dossier.<\/p><\/div>\n    <\/div>\n    <div class=\"metrics\" id=\"gkms-metrics\" style=\"margin-top:56px\">\n      <div class=\"metric\"><div class=\"mk\">Chemistry families<\/div><div class=\"mv\" data-to=\"3\">0<\/div><p>Epoxy, PU prepolymers \/ isocyanates and reactive adhesives - one measurement layer.<\/p><\/div>\n      <div class=\"metric\"><div class=\"mk\">Isolated NCO band<\/div><div class=\"mv\" data-to=\"2270\" data-suffix=\" cm&#8315;&sup1;\">0<span class=\"u\"> cm&#8315;&sup1;<\/span><\/div><p>The isocyanate NCO band - strong and isolated, a near-ideal Raman target.<\/p><\/div>\n      <div class=\"metric\"><div class=\"mk\">Acquisition<\/div><div class=\"mv\" data-to=\"5\" data-suffix=\"s\">0<span class=\"u\">s<\/span><\/div><p>A single Raman acquisition takes from 5 seconds.<\/p><\/div>\n      <div class=\"metric\"><div class=\"mk\">NCO titration removed<\/div><div class=\"mv\" data-to=\"40\" data-suffix=\"min\">0<span class=\"u\">min<\/span><\/div><p>Di-n-butylamine NCO titration at the top of its range - off the critical path, and the operator exposure with it.<\/p><\/div>\n    <\/div>\n  <\/div>\n<\/section>\n\n<div class=\"pager\">\n    <span><\/span>\n    <span><a href=\"\/epoxy-reactive-resins\/what-we-measure\/\">What we measure &rarr;<\/a><\/span>\n  <\/div>\n<section id=\"contact\">\n    <div class=\"wrap\">\n      <div class=\"cta reveal\">\n        <span class=\"eyebrow no-line\" style=\"color:#fff;justify-content:center\">Your next step<\/span>\n        <h2 class=\"h2\">Start with your own reactive chemistry.<\/h2>\n        <p>Send representative samples from your epoxy, polyurethane-prepolymer or reactive-adhesive process. We build and validate a chemometric model on your matrix in the Gekko lab and report exactly what inline Raman reads on your line - NCO%, the R index, epoxide equivalent weight, cure state - before any hardware decision.<\/p>\n        <form class=\"gkms-form\" data-region=\"m6-epoxy-reactive-resins\" data-region-label=\"Microsite M6 - Epoxy, isocyanate and reactive resins\" data-source=\"microsite-m6-chemistry\" novalidate>\n          <div class=\"gkms-form-q\">What would you like to do?<\/div>\n          <div class=\"gkms-choices\" role=\"radiogroup\" aria-label=\"What would you like to do?\">\n            <button type=\"button\" class=\"gkms-opt is-sel\" data-val=\"feasibility\" role=\"radio\" aria-checked=\"true\">Feasibility study<\/button>\n            <button type=\"button\" class=\"gkms-opt\" data-val=\"workshop\" role=\"radio\" aria-checked=\"false\">Workshop seat<\/button>\n            <button type=\"button\" class=\"gkms-opt\" data-val=\"info\" role=\"radio\" aria-checked=\"false\">Send info<\/button>\n          <\/div>\n          <p class=\"gkms-hint\" id=\"gkms-hint\"><\/p>\n          <div class=\"gkms-row\">\n            <input type=\"email\" class=\"gkms-email\" name=\"email\" required placeholder=\"you@company.com\" autocomplete=\"email\" aria-label=\"Your work email\">\n            <button type=\"submit\" class=\"btn btn-light gkms-submit\">Send request<\/button>\n          <\/div>\n          <input type=\"text\" class=\"gkms-hp\" name=\"company_hp\" tabindex=\"-1\" autocomplete=\"off\" aria-hidden=\"true\">\n          <label class=\"gkms-consent\"><input type=\"checkbox\" class=\"gkms-consent-cb\" name=\"consent\" required><span>By submitting this form, I confirm I have read and understood the <a href=\"https:\/\/gekkophotonics.com\/en\/privacy-policy\/\" target=\"_blank\" rel=\"noopener\">privacy policy<\/a> <span class=\"gkms-req\">*<\/span><\/span><\/label>\n          <p class=\"gkms-msg\" aria-live=\"polite\"><\/p>\n        <\/form>\n        <p class=\"cta-alt\"><a href=\"https:\/\/gekkophotonics.com\/products\/spectrally-inline\/\">Explore Spectrally X1 INLINE -&gt;<\/a><\/p>\n      <\/div>\n    <\/div>\n  <\/section>\n<footer class=\"foot\">\n    <div class=\"wrap\">\n      <div class=\"foot-grid\">\n        <div>\n          <img decoding=\"async\" class=\"flogo\" src=\"https:\/\/gekkophotonics.com\/wp-content\/uploads\/2026\/07\/logo-full-5.png\" alt=\"Gekko Photonics\">\n          <p class=\"ftag\">Engineering-Driven Analytics. Real-time process composition with inline Raman spectroscopy.<\/p>\n        <\/div>\n        <div>\n          <h5>Platform<\/h5>\n          <a href=\"https:\/\/gekkophotonics.com\/products\/spectrally-inline\/\">Spectrally X1 INLINE<\/a>\n          <a href=\"https:\/\/gekkophotonics.com\/\">Spectrally X1 PROBE<\/a>\n          <a href=\"https:\/\/gekkophotonics.com\/\">Spectrally OS<\/a>\n        <\/div>\n        <div>\n          <h5>This mini-site<\/h5>\n          <a href=\"\/epoxy-reactive-resins\/chemistry\/\">Chemistry<\/a>\n          <a href=\"\/epoxy-reactive-resins\/what-we-measure\/\">What we measure<\/a>\n          <a href=\"\/epoxy-reactive-resins\/how-it-works\/\">How it works<\/a>\n          <a href=\"\/epoxy-reactive-resins\/proof\/\">Proof<\/a>\n          <a href=\"\/epoxy-reactive-resins\/compliance\/\">Compliance<\/a>\n          <a href=\"\/epoxy-reactive-resins\/instrument\/\">Instrument<\/a>\n        <\/div>\n        <div>\n          <h5>Contact<\/h5>\n          <a href=\"mailto:contact@gekkophotonics.com\">contact@gekkophotonics.com<\/a>\n          <a href=\"https:\/\/gekkophotonics.com\/\">gekkophotonics.com<\/a>\n          <div class=\"addr\">NextCorps, 260 E. 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