{"id":2899,"date":"2026-07-20T15:39:16","date_gmt":"2026-07-20T13:39:16","guid":{"rendered":"https:\/\/gekkophotonics.com\/specialty-silicones\/chemistry\/"},"modified":"2026-07-20T15:39:16","modified_gmt":"2026-07-20T13:39:16","slug":"chemistry","status":"publish","type":"page","link":"https:\/\/gekkophotonics.com\/en\/specialty-silicones\/silicone-chemistry-pdms-lsr-hcr-chlorosilane-raman\/","title":{"rendered":"Silicone Chemistry \u2013 PDMS, LSR\/HCR &amp; Chlorosilane Inline Raman | Gekko Photonics"},"content":{"rendered":"<style>.elementor-2899 .elementor-element.elementor-element-9915faa{margin-top:0px;margin-bottom:0px;padding:0px 0px 0px 0px;}.elementor-2899 .elementor-element.elementor-element-8c4c547 > .elementor-element-populated{padding:0px 0px 0px 0px;}@media(min-width:768px){.elementor-2899 .elementor-element.elementor-element-8c4c547{width:100%;}}<\/style>\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"2899\" class=\"elementor elementor-2899 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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 72%);border-radius:var(--r-xl);padding:36px 20px;box-shadow:var(--sh-lg);text-align:center;border:1px solid rgba(255,255,255,.06);position:relative;overflow:hidden}\n#gkms .prod-photo::after{content:\"\";position:absolute;left:10%;right:10%;bottom:0;height:1px;background:linear-gradient(90deg,transparent,rgba(1,159,226,.45),transparent)}\n#gkms .prod-photo img{margin:0 auto;max-height:460px;width:auto;position:relative}\n#gkms .spec-table{width:100%;border-collapse:collapse;background:#fff;border-radius:var(--r-md);overflow:hidden;border:1px solid var(--g100);margin-top:22px}\n#gkms .spec-table td{padding:12px 18px;font-size:14px;border-bottom:1px solid var(--g100)}\n#gkms .spec-table tr:last-child td{border-bottom:none}\n#gkms .spec-table td:first-child{font-weight:600;color:var(--gk-navy-deep);width:44%}\n#gkms .spec-table td:last-child{color:var(--gk-slate)}\n\n\/* ---- CTA ---- *\/\n#gkms .cta{background:linear-gradient(135deg,#019FE2 0%,#2B2E83 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=\"\/specialty-silicones\/\"><img decoding=\"async\" class=\"logo\" src=\"https:\/\/gekkophotonics.com\/wp-content\/uploads\/2026\/07\/logo-full-4.png\" alt=\"Gekko Photonics\"><\/a>\n      <div class=\"nav-links\">\n      <a href=\"\/specialty-silicones\/\">Home<\/a>\n      <a href=\"\/specialty-silicones\/chemistry\/\" class=\"active\">Chemistry<\/a>\n      <a href=\"\/specialty-silicones\/what-we-measure\/\">What we measure<\/a>\n      <a href=\"\/specialty-silicones\/how-it-works\/\">How it works<\/a>\n      <a href=\"\/specialty-silicones\/proof\/\">Proof<\/a>\n      <a href=\"\/specialty-silicones\/compliance\/\">Compliance<\/a>\n      <a href=\"\/specialty-silicones\/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=\"\/specialty-silicones\/\">Industrial &amp; specialty silicones<\/a> \/ Chemistry<\/div>\n    <span class=\"eyebrow\">Chemistry coverage<\/span>\n    <h1 class=\"display\" style=\"margin-top:16px\">Four silicone chemistries. <span class=\"accent\">One measurement layer.<\/span><\/h1>\n    <p class=\"lead\">PDMS, addition-cure LSR\/HCR, chlorosilanes and medical-grade silicones - the silicone chemistries this mini-site covers, and what Spectrally reads inline, in the reactor or line 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 chlorosilane monomer to cured silicone.<\/h2>\n      <p class=\"lead\">Silicone processes run different chemistries - polycondensation, platinum addition-cure and chlorosilane distillation - but they share one blind spot: the parameter that defines the product comes back from GC\/MS, GC or DSC 20 to 120 minutes after a sample leaves the line. Spectrally X1 INLINE puts one Raman measurement layer across all of it. An immersion probe reads the medium where it reacts, a chemometric model per matrix turns the spectrum into numbers, and the result - siloxane chain length, silanol and vinyl content, residual cyclics and cure state - reaches your PLC or DCS in about 5 seconds, with no sample drawn and no line stop.<\/p>\n    <\/div>\n    <div class=\"ctx-grid\">\n      <div class=\"ctx-item reveal\"><div class=\"k\">Base polymer<\/div><div class=\"v\">PDMS<\/div><p>Polycondensation of Si-OH with elimination of water or methanol - the base for silicone rubber, fluids and gels. Molecular weight sets viscosity; residual cyclics read at the siloxane band near 490 cm&#8315;&sup1;.<\/p><\/div>\n      <div class=\"ctx-item reveal\"><div class=\"k\">Cure system<\/div><div class=\"v\">Addition-cure LSR \/ HCR<\/div><p>Liquid and high-consistency silicone rubber crosslinked by the Si-H + vinyl reaction over a platinum catalyst, no by-product eliminated. Crosslinking read directly from the Si-H and vinyl bands.<\/p><\/div>\n      <div class=\"ctx-item reveal\"><div class=\"k\">Monomer<\/div><div class=\"v\">Chlorosilanes<\/div><p>Me&#8322;SiCl&#8322; \/ MeSiCl&#8323; \/ Me&#8323;SiCl from the Muller-Rochow process. The D\/T\/M ratio sets the silicone type, read inline through a sapphire window on the corrosive HCl stream.<\/p><\/div>\n      <div class=\"ctx-item reveal\"><div class=\"k\">Regulated<\/div><div class=\"v\">Medical-grade silicones<\/div><p>LSR and RTV for implants, catheters and valve membranes - Class III devices under EU MDR 2017\/745. Crosslinking documented per batch for the CE dossier.<\/p><\/div>\n    <\/div>\n  <\/div>\n<\/section>\n\n<!-- ===== 02 \u00b7 PDMS ===== -->\n<section id=\"pdms\">\n  <div class=\"wrap\">\n    <div class=\"sec-head reveal\">\n      <span class=\"num\">02<\/span>\n      <span class=\"eyebrow\">PDMS &middot; Polydimethylsiloxane<\/span>\n      <h2 class=\"h2\">PDMS: chain length and residual cyclics, read in the reactor.<\/h2>\n      <p class=\"lead\">Polydimethylsiloxane is built by polycondensation of silanol (Si-OH) groups with the elimination of water or methanol - the base for silicone rubber, fluids and gels, where molecular weight sets the viscosity and the application. Two questions define the batch: how far the condensation has run, and how much cyclic siloxane (D4, D5, D6) is left against the linear chain.<\/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 PDMS<\/span>\n          <h3>From a 60-120 minute GC\/MS slot to a live siloxane read.<\/h3>\n          <p>Residual cyclics by GC\/MS take 60 to 120 minutes per sample with an extraction step, and inline viscometry gives a molecular-weight proxy with no composition behind it. The probe reads the siloxane structure where it forms:<\/p>\n          <ul>\n            <li>Residual cyclics D4\/D5\/D6 against linear PDMS, from the siloxane band near 490 cm&#8315;&sup1;<\/li>\n            <li>Condensation progress and silanol (Si-OH) content, tracked live through the cook<\/li>\n            <li>Chain length \/ degree of polymerization read from the spectrum instead of inferred from a viscosity proxy<\/li>\n          <\/ul>\n          <p style=\"margin-top:16px\">The siloxane band separates cyclic from linear directly, where NIR cannot. The self-cleaning probe retracts, rinses and returns between reads, so curing and filming media stay readable through a full campaign, and the immersion probe holds pH 2-10 continuously.<\/p>\n        <\/div>\n        <div class=\"tp-photo\"><img decoding=\"async\" src=\"https:\/\/gekkophotonics.com\/wp-content\/uploads\/2026\/07\/probe-reactor-line-1.jpg\" alt=\"Spectrally X1 PROBE mounted on a PDMS reactor line\"><\/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\">PDMS reaction mixture<\/span><img decoding=\"async\" src=\"https:\/\/gekkophotonics.com\/wp-content\/uploads\/2026\/07\/probe-resin-line-1.jpg\" alt=\"Spectrally X1 PROBE immersed in a silicone reaction mixture\"><\/div>\n        <div class=\"pbody\">\n          <h4>Cyclics read where GC\/MS cannot follow<\/h4>\n          <p>The questions that define a PDMS batch map onto specific, strong Raman bands - the siloxane band near <b>490 cm&#8315;&sup1;<\/b> separates cyclic D4\/D5\/D6 from the linear chain, and the same spectrum carries the condensation progress. Read continuously in the reactor, inline, where GC\/MS, gel-time and DSC only sample offline. The feasibility study on your PDMS stream 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\">Reference case - Phenol-formaldehyde resins<\/span><img decoding=\"async\" src=\"https:\/\/gekkophotonics.com\/wp-content\/uploads\/2026\/07\/inline-cabinet-detail.jpg\" alt=\"Spectrally X1 INLINE analyzer front panel at a process plant\"><\/div>\n        <div class=\"pbody\">\n          <h4>A closed loop, documented on the platform<\/h4>\n          <p>On phenol-formaldehyde resins - a condensation 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 PDMS critical path<\/h3>\n      <div class=\"repl\">\n        <div class=\"item reveal\"><span class=\"lag\">60-120 min<\/span><div><div class=\"m\">GC\/MS - residual cyclics D4\/D5\/D6<\/div><div class=\"s\">Plus an extraction step. Read inline from the siloxane band; GC\/MS becomes a periodic reference.<\/div><\/div><\/div>\n        <div class=\"item reveal\"><span class=\"lag\">30-60 min<\/span><div><div class=\"m\">GC-FID - linear vs cyclic<\/div><div class=\"s\">Manual draw and a lab bench. Tracked continuously in the reactor instead.<\/div><\/div><\/div>\n        <div class=\"item reveal\"><span class=\"lag\">proxy only<\/span><div><div class=\"m\">Inline viscometry<\/div><div class=\"s\">A molecular-weight proxy with no composition. Chain length comes off the spectrum directly.<\/div><\/div><\/div>\n        <div class=\"item reveal\"><span class=\"lag\">ambiguous<\/span><div><div class=\"m\">NIR<\/div><div class=\"s\">Does not separate cyclic from linear siloxane. The 490 cm&#8315;&sup1; band resolves it.<\/div><\/div><\/div>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/section>\n\n<!-- ===== 03 \u00b7 ADDITION-CURE LSR \/ HCR ===== -->\n<section id=\"lsr\" class=\"ctx\">\n  <div class=\"wrap\">\n    <div class=\"sec-head reveal\">\n      <span class=\"num\">03<\/span>\n      <span class=\"eyebrow\">LSR \/ HCR &middot; Addition cure<\/span>\n      <h2 class=\"h2\">Addition-cure rubber: crosslinking watched band by band.<\/h2>\n      <p class=\"lead\">Liquid Silicone Rubber and High Consistency Rubber are crosslinked by the Si-H + vinyl reaction over a platinum (Karstedt) catalyst, with no by-product eliminated. The cure is a crosslinking reaction, and its progress is written directly into two Raman bands that fall as it runs.<\/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 LSR \/ HCR<\/span>\n          <h3>Crosslinking read as the Si-H and vinyl bands vanish.<\/h3>\n          <p>Cure today is judged by observational gel-time, by offline DSC at 30 to 90 minutes, or by a rotational rheometer as a proxy - none of them a live read on the chemistry. Raman follows the reaction itself:<\/p>\n          <ul>\n            <li>Crosslinking tracked as the Si-H band near 2160 cm&#8315;&sup1; is consumed<\/li>\n            <li>Vinyl content followed at the C=C band near 1600 cm&#8315;&sup1;<\/li>\n            <li>The cure endpoint read from the spectrum instead of a stopwatch or an offline thermogram<\/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-lsr-production.jpg\" alt=\"Liquid silicone rubber production line with stainless steel metering and mixing equipment\"><\/div>\n      <\/div>\n    <\/div>\n\n    <div class=\"duel reveal\" style=\"margin-top:40px\">\n      <div class=\"duel-row duel-head\"><div class=\"old\">LSR \/ HCR cure check<\/div><div class=\"mid\"><\/div><div class=\"new\">Spectrally inline<\/div><\/div>\n      <div class=\"duel-row\"><div class=\"old\"><span class=\"xk\">&times;<\/span>Cure judged by observational gel-time<\/div><div class=\"mid\">&rarr;<\/div><div class=\"new\"><span class=\"ck\">&check;<\/span>Crosslinking read from the Si-H and vinyl bands in seconds<\/div><\/div>\n      <div class=\"duel-row\"><div class=\"old\"><span class=\"xk\">&times;<\/span>DSC: 30-90 min on a pulled sample<\/div><div class=\"mid\">&rarr;<\/div><div class=\"new\"><span class=\"ck\">&check;<\/span>Cure state tracked live in the reactor or line<\/div><\/div>\n      <div class=\"duel-row\"><div class=\"old\"><span class=\"xk\">&times;<\/span>Rotational rheometer: offline proxy<\/div><div class=\"mid\">&rarr;<\/div><div class=\"new\"><span class=\"ck\">&check;<\/span>The vinyl and Si-H bands carry the chemistry directly<\/div><\/div>\n      <div class=\"duel-row\"><div class=\"old\"><span class=\"xk\">&times;<\/span>FTIR ATR: R&amp;D on finished samples<\/div><div class=\"mid\">&rarr;<\/div><div class=\"new\"><span class=\"ck\">&check;<\/span>In-process composition on the running batch<\/div><\/div>\n      <div class=\"duel-row\"><div class=\"old\"><span class=\"xk\">&times;<\/span>Cure confirmed after the part is molded<\/div><div class=\"mid\">&rarr;<\/div><div class=\"new\"><span class=\"ck\">&check;<\/span>Crosslinking visible while the batch can still be corrected<\/div><\/div>\n    <\/div>\n  <\/div>\n<\/section>\n\n<!-- ===== 04 \u00b7 CHLOROSILANES ===== -->\n<section id=\"chlorosilanes\">\n  <div class=\"wrap\">\n    <div class=\"sec-head reveal\">\n      <span class=\"num\">04<\/span>\n      <span class=\"eyebrow\">Chlorosilanes &middot; Muller-Rochow<\/span>\n      <h2 class=\"h2\">Chlorosilanes: the D\/T\/M ratio that sets the silicone.<\/h2>\n      <p class=\"lead\">Me&#8322;SiCl&#8322;, MeSiCl&#8323; and Me&#8323;SiCl come off the Muller-Rochow process - silicon and methyl chloride at about 300 &deg;C over a copper catalyst. The D\/T\/M monomer ratio sets the type of every silicone built downstream, and the corrosive HCl by-product makes the stream hard to sample.<\/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 chlorosilanes<\/span>\n          <h3>Composition read inline through a sapphire window.<\/h3>\n          <p>Composition by GC takes 20 to 40 minutes and needs HCl protection at the sampling point, and NIR loses selectivity with HCl present. The probe reads the stream directly after the reactor:<\/p>\n          <ul>\n            <li>The Me&#8322;SiCl&#8322; \/ MeSiCl&#8323; \/ Me&#8323;SiCl (D\/T\/M) ratio, inline after the reactor<\/li>\n            <li>Stream composition tracked continuously as the distillation runs<\/li>\n            <li>No manual draw from a corrosive, HCl-bearing stream<\/li>\n          <\/ul>\n          <p style=\"margin-top:16px\">Because the HCl by-product is corrosive, the probe uses a sapphire (Al&#8322;O&#8323;) window in place of the standard fused silica, and the ATEX \/ IECEx Zone 0 build runs on the 30 mW laser.<\/p>\n        <\/div>\n        <div class=\"tp-photo reveal\"><img decoding=\"async\" src=\"https:\/\/gekkophotonics.com\/wp-content\/uploads\/2026\/07\/gen-chlorosilane-columns.jpg\" alt=\"Chlorosilane distillation columns at a silicone monomer plant\"><\/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 chlorosilane critical path<\/h3>\n      <div class=\"repl\">\n        <div class=\"item reveal\"><span class=\"lag\">20-40 min<\/span><div><div class=\"m\">GC - D\/T\/M composition<\/div><div class=\"s\">With HCl protection at the sampling point. Read inline through the sapphire window instead.<\/div><\/div><\/div>\n        <div class=\"item reveal\"><span class=\"lag\">limited<\/span><div><div class=\"m\">NIR<\/div><div class=\"s\">Selectivity drops with HCl present. Raman reads the chlorosilane bands directly.<\/div><\/div><\/div>\n        <div class=\"item reveal\"><span class=\"lag\">manual<\/span><div><div class=\"m\">Sampling of a corrosive stream<\/div><div class=\"s\">Hand draws from an HCl-bearing line, removed - the probe sits in the stream.<\/div><\/div><\/div>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/section>\n\n<!-- ===== 05 \u00b7 MEDICAL-GRADE SILICONES ===== -->\n<section id=\"medical\" class=\"ctx\">\n  <div class=\"wrap\">\n    <div class=\"sec-head reveal\">\n      <span class=\"num\">05<\/span>\n      <span class=\"eyebrow\">Medical-grade &middot; Class III<\/span>\n      <h2 class=\"h2\">Medical-grade silicones: a per-batch crosslinking record.<\/h2>\n      <p class=\"lead\">LSR and RTV silicones for implants, catheters and valve membranes are Class III medical devices under EU MDR 2017\/745, and they demand a documented, repeatable crosslinking process for every batch. The same addition-cure chemistry runs here - the difference is the weight the record carries.<\/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 medical-grade silicone<\/span>\n          <h3>Crosslinking documented for the CE dossier - a clean division of labor.<\/h3>\n          <p>Raman owns the composition and cure side of the batch record, continuously and in-process:<\/p>\n          <ul>\n            <li>Crosslinking degree from the Si-H band near 2160 cm&#8315;&sup1; and the vinyl C=C band near 1600 cm&#8315;&sup1;, per batch<\/li>\n            <li>A continuous, time-stamped process record for the CE dossier and the Notified Body review<\/li>\n            <li>Composition and cure confirmed in-process, not reconstructed from pulled samples<\/li>\n          <\/ul>\n          <p style=\"margin-top:16px\">Residual platinum catalyst is quantified by ICP as an element - a clean division of labor, with Raman owning the composition and crosslinking side. Every acquisition is stored and exportable as a per-batch record alongside the ISO 10993 biocompatibility documentation.<\/p>\n        <\/div>\n        <div class=\"tp-photo reveal\"><img decoding=\"async\" src=\"https:\/\/gekkophotonics.com\/wp-content\/uploads\/2026\/07\/gen-medical-silicone.jpg\" alt=\"Cleanroom production of medical-grade silicone tubing and membranes\"><\/div>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/section>\n\n<!-- ===== 06 \u00b7 ONE PLATFORM ===== -->\n<section id=\"platform\" class=\"band\">\n  <div class=\"wrap\">\n    <div class=\"sec-head reveal\">\n      <span class=\"num\">06<\/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\">Four chemistries. The same instrument, the same workflow.<\/h2>\n      <p class=\"lead\" style=\"color:#C8D0DC\">Every stream above is measured by the same platform: a Spectrally X1 PROBE in the vessel or line, 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 silicones<\/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. Fused silica window as standard, sapphire (Al&#8322;O&#8323;) for corrosive chlorosilane and HCl media. The self-cleaning module retracts and rinses the optics between reads, so curing silicone stays readable.<\/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. Calibration maintains itself from a reference in the probe, 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>Chain length, cure state and D\/T\/M ratios 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 quality 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=\"4\">0<\/div><p>PDMS, addition-cure LSR\/HCR, chlorosilanes and medical-grade silicones - one measurement layer.<\/p><\/div>\n      <div class=\"metric\"><div class=\"mk\">Diagnostic bands<\/div><div class=\"mv\" data-to=\"3\">0<\/div><p>Si-H at 2160, vinyl C=C at 1600 and siloxane at 490 cm&#8315;&sup1; - read directly.<\/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\">Slowest loop removed<\/div><div class=\"mv\" data-to=\"120\" data-suffix=\"min\">0<span class=\"u\">min<\/span><\/div><p>GC\/MS residual cyclics at the top of its range - off the critical path.<\/p><\/div>\n    <\/div>\n  <\/div>\n<\/section>\n\n<div class=\"pager\">\n    <span><\/span>\n    <span><a href=\"\/specialty-silicones\/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 silicone chemistry.<\/h2>\n        <p>Send representative samples from your PDMS, LSR\/HCR, chlorosilane or medical-grade silicone 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 - residual cyclics, crosslinking, chain length - before any hardware decision.<\/p>\n        <form class=\"gkms-form\" data-region=\"m5-specialty-silicones\" data-region-label=\"Microsite M5 - Industrial and specialty silicones\" data-source=\"microsite-m5-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-4.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=\"\/specialty-silicones\/chemistry\/\">Chemistry<\/a>\n          <a href=\"\/specialty-silicones\/what-we-measure\/\">What we measure<\/a>\n          <a href=\"\/specialty-silicones\/how-it-works\/\">How it works<\/a>\n          <a href=\"\/specialty-silicones\/proof\/\">Proof<\/a>\n          <a href=\"\/specialty-silicones\/compliance\/\">Compliance<\/a>\n          <a href=\"\/specialty-silicones\/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. Main Street, Suite 6000<br>Rochester, NY 14604, USA<\/div>\n        <\/div>\n      <\/div>\n      <div class=\"fbottom\">\n        <span>&copy; 2026 Gekko Photonics Sp. z o.o. 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