{"id":2863,"date":"2026-07-20T15:09:49","date_gmt":"2026-07-20T13:09:49","guid":{"rendered":"https:\/\/gekkophotonics.com\/coating-composite-resins\/what-we-measure\/"},"modified":"2026-07-20T15:09:49","modified_gmt":"2026-07-20T13:09:49","slug":"what-we-measure","status":"publish","type":"page","link":"https:\/\/gekkophotonics.com\/de\/coating-composite-resins\/was-wir-messen-sechs-inline-parameter\/","title":{"rendered":"What We Measure: Six Inline Parameters for Coating &#038; Composite Resins | Gekko Photonics"},"content":{"rendered":"<style>.elementor-2863 .elementor-element.elementor-element-997c34d{margin-top:0px;margin-bottom:0px;padding:0px 0px 0px 0px;}.elementor-2863 .elementor-element.elementor-element-1e91c48 > .elementor-element-populated{padding:0px 0px 0px 0px;}@media(min-width:768px){.elementor-2863 .elementor-element.elementor-element-1e91c48{width:100%;}}<\/style>\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"2863\" class=\"elementor elementor-2863 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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=\"\/coating-composite-resins\/\"><img decoding=\"async\" class=\"logo\" src=\"https:\/\/gekkophotonics.com\/wp-content\/uploads\/2026\/07\/logo-full-3.png\" alt=\"Gekko Photonics\"><\/a>\n      <div class=\"nav-links\">\n      <a href=\"\/coating-composite-resins\/\">Home<\/a>\n      <a href=\"\/coating-composite-resins\/chemistry\/\">Chemistry<\/a>\n      <a href=\"\/coating-composite-resins\/what-we-measure\/\" class=\"active\">What we measure<\/a>\n      <a href=\"\/coating-composite-resins\/how-it-works\/\">How it works<\/a>\n      <a href=\"\/coating-composite-resins\/proof\/\">Proof<\/a>\n      <a href=\"\/coating-composite-resins\/compliance\/\">Compliance<\/a>\n      <a href=\"\/coating-composite-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=\"\/coating-composite-resins\/\">Coating &amp; composite resins<\/a> \/ What we measure<\/div>\n    <span class=\"eyebrow\">What Spectrally reads<\/span>\n    <h1 class=\"display\" style=\"margin-top:16px\">Six values that decide <span class=\"accent\">when to stop the reactor.<\/span><\/h1>\n    <p class=\"lead\">Acid value, hydroxyl value, the viscosity endpoint, monomer conversion, %solids \/ NVM and emulsion consistency - each read straight from the Raman spectrum by a dedicated chemometric model.<\/p>\n  <\/div>\n<\/header>\n\n<!-- ===== 01 \u00b7 OVERVIEW ===== -->\n  <section id=\"overview\">\n    <div class=\"wrap\">\n      <div class=\"sec-head reveal\">\n        <span class=\"num\">01<\/span>\n        <span class=\"eyebrow\">What we measure<\/span>\n        <h2 class=\"h2\">One spectrum in. Six process values out.<\/h2>\n        <p class=\"lead\">In alkyd, acrylic and composite-resin reactors, the batch decision comes down to a handful of composition values - and most of them still come back from the lab after the reaction has moved on. All of them live in the Raman spectrum of the reaction mixture, read inline - in the reactor itself, continuously, with no sampling. Each is extracted by its own chemometric model, calibrated against your laboratory's reference values.<\/p>\n      <\/div>\n      <div class=\"ctx-grid\">\n        <div class=\"ctx-item reveal\"><div class=\"k\">Source<\/div><div class=\"v\">One Raman spectrum<\/div><p>Laser excitation at 785 nm, with a 1064 nm variant for strongly fluorescing drying-oil alkyds. Spectral range 300-1650 or 300-3500 cm&#8315;&sup1; at 8 cm&#8315;&sup1; resolution.<\/p><\/div>\n        <div class=\"ctx-item reveal\"><div class=\"k\">Acquisition<\/div><div class=\"v\">From 5 seconds<\/div><p>A single acquisition takes from 5 s. The reaction trajectory becomes a live curve instead of a titration every 30-60 minutes.<\/p><\/div>\n        <div class=\"ctx-item reveal\"><div class=\"k\">Extraction<\/div><div class=\"v\">One model per parameter<\/div><p>AI and advanced chemometrics in Spectrally OS, a CNN core reading the full spectrum - trained on your resin matrix and your recipes, not a generic library calibration.<\/p><\/div>\n        <div class=\"ctx-item reveal\"><div class=\"k\">Delivery<\/div><div class=\"v\">Ordinary process tags<\/div><p>Values arrive in the PLC \/ DCS over PROFIBUS and PROFINET. Every measurement is stored and exportable as CSV, PDF or raw spectra.<\/p><\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <!-- ===== ANALYTE + SPECTRUM EXPLORER ===== -->\n  <section id=\"measure\" class=\"ctx\">\n    <div class=\"wrap\">\n      <div class=\"sec-head reveal\">\n        <span class=\"num\">02<\/span>\n        <span class=\"eyebrow\">What Spectrally reads<\/span>\n        <h2 class=\"h2\">The values that decide when the reaction is done.<\/h2>\n        <p class=\"lead\">Each value is pulled straight from the Raman spectrum by a dedicated chemometric model. Select a parameter to see where it sits on the spectrum.<\/p>\n      <\/div>\n\n      <div class=\"explorer\">\n        <div class=\"analyte-list\" id=\"gkms-analytes\">\n          <button class=\"analyte active\" data-a=\"0\"><span class=\"n\">Acid value<\/span><span class=\"band\">master endpoint<\/span><\/button>\n          <button class=\"analyte\" data-a=\"1\"><span class=\"n\">Hydroxyl value<\/span><span class=\"band\">OH value<\/span><\/button>\n          <button class=\"analyte\" data-a=\"2\"><span class=\"n\">Viscosity endpoint<\/span><span class=\"band\">Pa&middot;s<\/span><\/button>\n          <button class=\"analyte\" data-a=\"3\"><span class=\"n\">Monomer conversion \/ residual monomer<\/span><span class=\"band\">C=C<\/span><\/button>\n          <button class=\"analyte\" data-a=\"4\"><span class=\"n\">Resin solids \/ NVM<\/span><span class=\"band\">%<\/span><\/button>\n          <button class=\"analyte\" data-a=\"5\"><span class=\"n\">Emulsion consistency<\/span><span class=\"band\">profile<\/span><\/button>\n        <\/div>\n\n        <div class=\"spectrum-panel\">\n          <div class=\"sp-top\">\n            <span class=\"sp-live\"><span class=\"dot\"><\/span>Live &middot; Raman 785 nm<\/span>\n            <span class=\"sp-read\" id=\"gkms-spread\">Reactor R-1 &middot; acquiring<\/span>\n          <\/div>\n          <svg class=\"spec-svg\" viewBox=\"0 0 600 200\" preserveAspectRatio=\"none\">\n            <g class=\"grid\">\n              <line x1=\"0\" y1=\"50\" x2=\"600\" y2=\"50\"\/><line x1=\"0\" y1=\"100\" x2=\"600\" y2=\"100\"\/><line x1=\"0\" y1=\"150\" x2=\"600\" y2=\"150\"\/>\n              <line x1=\"150\" y1=\"0\" x2=\"150\" y2=\"200\"\/><line x1=\"300\" y1=\"0\" x2=\"300\" y2=\"200\"\/><line x1=\"450\" y1=\"0\" x2=\"450\" y2=\"200\"\/>\n            <\/g>\n            <path class=\"trace\" id=\"gkms-trace\" d=\"M0,170 L60,166 L110,150 L150,120 L190,158 L240,150 L300,70 L340,150 L400,135 L470,60 L520,150 L560,140 L600,150\"\/>\n            <line class=\"marker\" id=\"gkms-marker\" x1=\"470\" y1=\"0\" x2=\"470\" y2=\"200\"\/>\n            <text class=\"mlabel\" id=\"gkms-mlabel\" x=\"476\" y=\"20\">C=O ratio<\/text>\n          <\/svg>\n          <div class=\"spec-axis\">Raman shift (cm&#8315;&sup1;) &rarr;<\/div>\n          <div class=\"spec-detail\">\n            <div class=\"sd-name\" id=\"gkms-sdname\">Acid value<\/div>\n            <div class=\"sd-desc\" id=\"gkms-sddesc\">The esterification endpoint for alkyds, read from the acid\/ester carbonyl band ratio. Model vs lab R 0.982-0.998, MAE about 0.015 mg KOH\/g.<\/div>\n          <\/div>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <!-- ===== 03 \u00b7 ACID VALUE ===== -->\n  <section id=\"acid-value\">\n    <div class=\"wrap\">\n      <div class=\"sec-head reveal\">\n        <span class=\"num\">03<\/span>\n        <span class=\"eyebrow\">Parameter 1 of 6<\/span>\n        <h2 class=\"h2\">Acid value - the esterification endpoint for alkyds.<\/h2>\n        <p class=\"lead\">In alkyd and polyester resins, the acid value is the endpoint the whole cook is steered toward. Spectrally reads it inline from the ratio of the acid and ester carbonyl (C=O) bands near 1710 and 1730 cm&#8315;&sup1;.<\/p>\n      <\/div>\n      <div class=\"how-grid\">\n        <div class=\"how-points\">\n          <div class=\"how-point reveal\"><div class=\"hi\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.8\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"><circle cx=\"12\" cy=\"12\" r=\"6.5\"\/><path d=\"M12 2.5v3M12 18.5v3M2.5 12h3M18.5 12h3\"\/><circle cx=\"12\" cy=\"12\" r=\"1.2\" fill=\"currentColor\" stroke=\"none\"\/><\/svg><\/div><div><h4>Why it decides the batch<\/h4><p>Acid value fixes where the esterification is stopped. Variable reaction kinetics from batch to batch of drying oil make that point hard to predict, and every overshoot means a solvent correction or an off-spec batch.<\/p><\/div><\/div>\n          <div class=\"how-point reveal\"><div class=\"hi\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.8\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"><circle cx=\"12\" cy=\"12\" r=\"8.5\"\/><path d=\"M12 7.5V12l3 2\"\/><\/svg><\/div><div><h4>How it is read today<\/h4><p>Titration to ISO 3682: 30-60 minutes, and it requires stopping the reactor and pulling a sample by hand from a medium above 220 C. Offline viscometry adds only a proxy for progress.<\/p><\/div><\/div>\n          <div class=\"how-point reveal\"><div class=\"hi\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.8\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"><path d=\"M3 12h3.5l2.5-6.5 4 13 2.5-6.5H21\"\/><\/svg><\/div><div><h4>What reading it inline changes<\/h4><p>The acid value comes off the spectrum in real time, with no sampling. It has no single dedicated band, so a CNN model links the whole Raman spectrum to the value, built on the acid\/ester carbonyl band ratio. Feasibility on real alkyd resin: model vs lab R 0.982-0.998, mean absolute error about 0.015 mg KOH\/g.<\/p><\/div><\/div>\n        <\/div>\n        <div class=\"tp-photo reveal\"><img decoding=\"async\" src=\"https:\/\/gekkophotonics.com\/wp-content\/uploads\/2026\/07\/probe-flange-front-3.jpg\" alt=\"Spectrally X1 PROBE immersion flange on a resin reactor line\"><\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <!-- ===== 04 \u00b7 HYDROXYL VALUE ===== -->\n  <section id=\"hydroxyl-value\" class=\"ctx\">\n    <div class=\"wrap\">\n      <div class=\"sec-head reveal\">\n        <span class=\"num\">04<\/span>\n        <span class=\"eyebrow\">Parameter 2 of 6<\/span>\n        <h2 class=\"h2\">Hydroxyl value - the complementary group, tracked through the cook.<\/h2>\n        <p class=\"lead\">The hydroxyl value runs alongside the acid value as the second functional-group handle on the resin, followed through the process from the same spectrum.<\/p>\n      <\/div>\n      <div class=\"how-grid\">\n        <div class=\"tp-photo reveal\"><img decoding=\"async\" src=\"https:\/\/gekkophotonics.com\/wp-content\/uploads\/2026\/07\/alkyd-reactor-hall.jpg\" alt=\"Alkyd resin reactor hall with kettles and process piping\"><\/div>\n        <div class=\"how-points\">\n          <div class=\"how-point reveal\"><div class=\"hi\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.8\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"><circle cx=\"12\" cy=\"12\" r=\"6.5\"\/><path d=\"M12 2.5v3M12 18.5v3M2.5 12h3M18.5 12h3\"\/><circle cx=\"12\" cy=\"12\" r=\"1.2\" fill=\"currentColor\" stroke=\"none\"\/><\/svg><\/div><div><h4>Why it decides the batch<\/h4><p>Together with the acid value, the hydroxyl value sets the functionality and the downstream crosslinking behaviour your customer formulates around. Reading both from one spectrum keeps the two in step through the reaction.<\/p><\/div><\/div>\n          <div class=\"how-point reveal\"><div class=\"hi\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.8\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"><circle cx=\"12\" cy=\"12\" r=\"8.5\"\/><path d=\"M12 7.5V12l3 2\"\/><\/svg><\/div><div><h4>How it is read today<\/h4><p>Wet-chemical titration on a pulled sample, offline and after the fact - the same lab loop that already gates the acid value, run a second time.<\/p><\/div><\/div>\n          <div class=\"how-point reveal\"><div class=\"hi\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.8\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"><path d=\"M3 12h3.5l2.5-6.5 4 13 2.5-6.5H21\"\/><\/svg><\/div><div><h4>What reading it inline changes<\/h4><p>The hydroxyl value is tracked continuously from the same acquisition that returns the acid value - one probe, one spectrum, both functional-group values on the same live curve.<\/p><\/div><\/div>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <!-- ===== 05 \u00b7 VISCOSITY ENDPOINT ===== -->\n  <section id=\"viscosity\">\n    <div class=\"wrap\">\n      <div class=\"sec-head reveal\">\n        <span class=\"num\">05<\/span>\n        <span class=\"eyebrow\">Parameter 3 of 6<\/span>\n        <h2 class=\"h2\">Viscosity endpoint - stop on data, not on the clock.<\/h2>\n        <p class=\"lead\">The viscosity build is the classic alkyd endpoint signal, and it is read live from the same Raman spectrum as the acid value - no separate instrument, no separate sample.<\/p>\n      <\/div>\n      <div class=\"how-grid\">\n        <div class=\"how-points\">\n          <div class=\"how-point reveal\"><div class=\"hi\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.8\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"><circle cx=\"12\" cy=\"12\" r=\"6.5\"\/><path d=\"M12 2.5v3M12 18.5v3M2.5 12h3M18.5 12h3\"\/><circle cx=\"12\" cy=\"12\" r=\"1.2\" fill=\"currentColor\" stroke=\"none\"\/><\/svg><\/div><div><h4>Why it decides the batch<\/h4><p>The condensation has to be stopped at the right viscosity: too early and the resin is under-built, too late and it gels in the reactor. Between viscometry readings, crews bridge the gap with time and temperature - habit standing in for a measurement.<\/p><\/div><\/div>\n          <div class=\"how-point reveal\"><div class=\"hi\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.8\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"><circle cx=\"12\" cy=\"12\" r=\"8.5\"\/><path d=\"M12 7.5V12l3 2\"\/><\/svg><\/div><div><h4>How it is read today<\/h4><p>Offline rotational viscometry on a pulled sample - an indirect proxy for reaction progress that says nothing about composition, and lands minutes after the state it describes.<\/p><\/div><\/div>\n          <div class=\"how-point reveal\"><div class=\"hi\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.8\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"><path d=\"M3 12h3.5l2.5-6.5 4 13 2.5-6.5H21\"\/><\/svg><\/div><div><h4>What reading it inline changes<\/h4><p>Viscosity is inferred from the Raman spectrum alongside composition. Feasibility on real resin during synthesis: R 0.988-0.998 against the reference method - a live endpoint read, so the reactor stops on the measured endpoint instead of a conservative time margin.<\/p><\/div><\/div>\n        <\/div>\n        <div class=\"tp-photo reveal\"><img decoding=\"async\" src=\"https:\/\/gekkophotonics.com\/wp-content\/uploads\/2026\/07\/inline-resin-plant.jpg\" alt=\"Spectrally X1 INLINE analyzer cabinet at a resin plant\"><\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <!-- ===== 06 \u00b7 MONOMER CONVERSION \/ RESIDUAL MONOMER ===== -->\n  <section id=\"monomer\" class=\"ctx\">\n    <div class=\"wrap\">\n      <div class=\"sec-head reveal\">\n        <span class=\"num\">06<\/span>\n        <span class=\"eyebrow\">Parameter 4 of 6<\/span>\n        <h2 class=\"h2\">Monomer conversion - safety and quality in one number.<\/h2>\n        <p class=\"lead\">In acrylic resins and emulsions, monomer conversion and residual monomer come straight off the disappearing C=C monomer band - a single value that carries both the reaction endpoint and the VOC and odour question.<\/p>\n      <\/div>\n      <div class=\"how-grid\">\n        <div class=\"how-points\">\n          <div class=\"how-point reveal\"><div class=\"hi\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.8\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"><circle cx=\"12\" cy=\"12\" r=\"6.5\"\/><path d=\"M12 2.5v3M12 18.5v3M2.5 12h3M18.5 12h3\"\/><circle cx=\"12\" cy=\"12\" r=\"1.2\" fill=\"currentColor\" stroke=\"none\"\/><\/svg><\/div><div><h4>Why it decides the batch<\/h4><p>Residual monomer is a quality issue - VOC and odour - and a regulatory one, while copolymer composition sets Tg and coating properties. Conversion is the number that closes the polymerization.<\/p><\/div><\/div>\n          <div class=\"how-point reveal\"><div class=\"hi\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.8\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"><circle cx=\"12\" cy=\"12\" r=\"8.5\"\/><path d=\"M12 7.5V12l3 2\"\/><\/svg><\/div><div><h4>How it is read today<\/h4><p>GC for residual monomer at 30-60 minutes, GPC \/ SEC for the molecular-weight distribution at 60-120 minutes - both offline, both well behind the reactor.<\/p><\/div><\/div>\n          <div class=\"how-point reveal\"><div class=\"hi\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.8\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"><path d=\"M3 12h3.5l2.5-6.5 4 13 2.5-6.5H21\"\/><\/svg><\/div><div><h4>What reading it inline changes<\/h4><p>Conversion is read continuously from the C=C monomer band against the polymer bands, so the emulsion or solution batch is driven to its endpoint in real time instead of confirmed an hour later by GC.<\/p><\/div><\/div>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <!-- ===== 07 \u00b7 RESIN SOLIDS \/ NVM ===== -->\n  <section id=\"solids\">\n    <div class=\"wrap\">\n      <div class=\"sec-head reveal\">\n        <span class=\"num\">07<\/span>\n        <span class=\"eyebrow\">Parameter 5 of 6<\/span>\n        <h2 class=\"h2\">%Solids \/ NVM - composition, not a single index.<\/h2>\n        <p class=\"lead\">Non-volatile matter is one of the first numbers a customer reconciles on the certificate. Read continuously from the spectrum, it becomes a running value rather than a single refractometer point.<\/p>\n      <\/div>\n      <div class=\"how-grid\">\n        <div class=\"how-points\">\n          <div class=\"how-point reveal\"><div class=\"hi\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.8\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"><circle cx=\"12\" cy=\"12\" r=\"6.5\"\/><path d=\"M12 2.5v3M12 18.5v3M2.5 12h3M18.5 12h3\"\/><circle cx=\"12\" cy=\"12\" r=\"1.2\" fill=\"currentColor\" stroke=\"none\"\/><\/svg><\/div><div><h4>Why it decides the batch<\/h4><p>Solids define the grade. They have to hold consistent from batch to batch and from plant to plant, and every downstream dilution and dosing step assumes they do.<\/p><\/div><\/div>\n          <div class=\"how-point reveal\"><div class=\"hi\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.8\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"><circle cx=\"12\" cy=\"12\" r=\"8.5\"\/><path d=\"M12 7.5V12l3 2\"\/><\/svg><\/div><div><h4>How it is read today<\/h4><p>A single refractometer reading, or a gravimetric NVM check offline - one number, taken once, with no view of how the batch got there.<\/p><\/div><\/div>\n          <div class=\"how-point reveal\"><div class=\"hi\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.8\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"><path d=\"M3 12h3.5l2.5-6.5 4 13 2.5-6.5H21\"\/><\/svg><\/div><div><h4>What reading it inline changes<\/h4><p>%Solids \/ NVM comes off the same spectrum as acid value and viscosity - one probe, several parameters, all from the same instant in the batch. The refractive index becomes a cross-check instead of the only inline number you have.<\/p><\/div><\/div>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <!-- ===== 08 \u00b7 EMULSION CONSISTENCY ===== -->\n  <section id=\"emulsion\" class=\"ctx\">\n    <div class=\"wrap\">\n      <div class=\"sec-head reveal\">\n        <span class=\"num\">08<\/span>\n        <span class=\"eyebrow\">Parameter 6 of 6<\/span>\n        <h2 class=\"h2\">Emulsion consistency - grade-to-grade repeatability you can prove.<\/h2>\n        <p class=\"lead\">For acrylic emulsions, the value a customer feels is consistency: the same grade behaving the same way, batch after batch. The full-spectrum fingerprint makes that repeatability provable.<\/p>\n      <\/div>\n      <div class=\"how-grid\">\n        <div class=\"how-points\">\n          <div class=\"how-point reveal\"><div class=\"hi\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.8\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"><circle cx=\"12\" cy=\"12\" r=\"6.5\"\/><path d=\"M12 2.5v3M12 18.5v3M2.5 12h3M18.5 12h3\"\/><circle cx=\"12\" cy=\"12\" r=\"1.2\" fill=\"currentColor\" stroke=\"none\"\/><\/svg><\/div><div><h4>Why it decides the batch<\/h4><p>An emulsion that drifts grade to grade shows up downstream as inconsistent film formation and coating properties. Consistency is the property the grade is sold on.<\/p><\/div><\/div>\n          <div class=\"how-point reveal\"><div class=\"hi\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.8\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"><circle cx=\"12\" cy=\"12\" r=\"8.5\"\/><path d=\"M12 7.5V12l3 2\"\/><\/svg><\/div><div><h4>How it is read today<\/h4><p>Reconstructed after the fact from a handful of offline checks - solids, viscosity, residual monomer - each on its own sample and its own clock.<\/p><\/div><\/div>\n          <div class=\"how-point reveal\"><div class=\"hi\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.8\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"><path d=\"M3 12h3.5l2.5-6.5 4 13 2.5-6.5H21\"\/><\/svg><\/div><div><h4>What reading it inline changes<\/h4><p>The whole Raman fingerprint is logged continuously through the batch, so grade-to-grade repeatability is documented on hundreds of measurements rather than inferred from a few end-of-batch samples.<\/p><\/div><\/div>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <!-- ===== 09 \u00b7 WHAT COMES OFF YOUR CRITICAL PATH ===== -->\n  <section id=\"displaced\">\n    <div class=\"wrap\">\n      <div class=\"sec-head reveal\">\n        <span class=\"num\">09<\/span>\n        <span class=\"eyebrow\">The offline methods, displaced<\/span>\n        <h2 class=\"h2\">What comes off your critical path.<\/h2>\n        <p class=\"lead\">None of these methods disappears. They move from real-time gatekeeper to periodic verification - and the endpoint decision stops waiting for them.<\/p>\n      <\/div>\n      <div class=\"repl\">\n        <div class=\"item reveal\"><span class=\"lag\">30-60 min<\/span><div><div class=\"m\">Acid-value titration (ISO 3682)<\/div><div class=\"s\">Requires stopping the reactor and hand-sampling above 220 C. Becomes a periodic reference; the endpoint is steered inline.<\/div><\/div><\/div>\n        <div class=\"item reveal\"><span class=\"lag\">30-60 min<\/span><div><div class=\"m\">GC - residual monomer<\/div><div class=\"s\">Monomer conversion followed live from the C=C band during the batch.<\/div><\/div><\/div>\n        <div class=\"item reveal\"><span class=\"lag\">60-120 min<\/span><div><div class=\"m\">GPC \/ SEC - molecular weight<\/div><div class=\"s\">The molecular-weight distribution stays a lab reference while conversion is read inline.<\/div><\/div><\/div>\n        <div class=\"item reveal\"><span class=\"lag\">30-90 min<\/span><div><div class=\"m\">DSC - silicone cure<\/div><div class=\"s\">Vinyl-silicone crosslinking tracked from the vinyl C=C and Si-H bands instead.<\/div><\/div><\/div>\n        <div class=\"item reveal\"><span class=\"lag\">proxy<\/span><div><div class=\"m\">Offline rotational viscometry<\/div><div class=\"s\">An indirect progress signal without composition. Viscosity endpoint read continuously in the reactor.<\/div><\/div><\/div>\n        <div class=\"item reveal\"><span class=\"lag\">solids only<\/span><div><div class=\"m\">Single-point refractometry<\/div><div class=\"s\">One index, no composition. Replaced by multi-parameter reads from the same spectrum.<\/div><\/div><\/div>\n        <div class=\"item reveal\"><span class=\"lag\">fluorescence<\/span><div><div class=\"m\">NIR on drying-oil alkyds<\/div><div class=\"s\">Drying-oil fluorescence limits NIR; the 1064 nm Raman reads the fluorescing medium.<\/div><\/div><\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n\n<div class=\"pager\">\n    <span><a href=\"\/coating-composite-resins\/chemistry\/\">&larr; Chemistry<\/a><\/span>\n    <span><a href=\"\/coating-composite-resins\/how-it-works\/\">How it works &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\">See these six parameters read on your own resin.<\/h2>\n        <p>Send representative samples or R&amp;D data from your alkyd, acrylic or composite-resin process. We build and validate the chemometric model on your matrix and report exactly which of the six parameters inline Raman reads on your reactor, and how accurately. On alkyd acid value the models track the laboratory to R 0.982-0.998 at about 0.015 mg KOH\/g, with viscosity from the same spectrum at R 0.988-0.998.<\/p>\n        <form class=\"gkms-form\" data-region=\"m4-coating-composite-resins\" data-region-label=\"Microsite M4 - Coating and composite resins\" data-source=\"microsite-m4-what-we-measure\" 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-3.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=\"\/coating-composite-resins\/chemistry\/\">Chemistry<\/a>\n          <a href=\"\/coating-composite-resins\/what-we-measure\/\">What we measure<\/a>\n          <a href=\"\/coating-composite-resins\/how-it-works\/\">How it works<\/a>\n          <a href=\"\/coating-composite-resins\/proof\/\">Proof<\/a>\n          <a href=\"\/coating-composite-resins\/compliance\/\">Compliance<\/a>\n          <a href=\"\/coating-composite-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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Installation and service by authorized Gekko Photonics technicians only.<\/span>\n        <span class=\"tagpl\">Engineering-Driven Analytics<\/span>\n      <\/div>\n    <\/div>\n  <\/footer>\n<\/div>\n\n<script>\n(function(){\n  var root=document.getElementById('gkms'); if(!root||root.dataset.init)return; root.dataset.init=\"1\";\n\n  var bar=root.querySelector('#gkms-progress');\n  if(bar){window.addEventListener('scroll',function(){\n    var h=document.documentElement,b=document.body;\n    var st=(h.scrollTop||b.scrollTop),sh=(h.scrollHeight-h.clientHeight);\n    bar.style.width=(sh>0?(st\/sh*100):0)+'%';\n  },{passive:true});}\n\n  root.querySelectorAll('a[href^=\"#\"]').forEach(function(a){\n    a.addEventListener('click',function(e){\n      var t=root.querySelector(a.getAttribute('href')); if(!t)return;\n      e.preventDefault(); window.scrollTo({top:t.offsetTop-70,behavior:'smooth'});\n    });\n  });\n\n  var io=new IntersectionObserver(function(es){es.forEach(function(en){if(en.isIntersecting){en.target.classList.add('in');io.unobserve(en.target);}});},{threshold:0.14});\n  root.querySelectorAll('.reveal').forEach(function(el){io.observe(el);});\n\n  root.querySelectorAll('.tab').forEach(function(t){\n    t.addEventListener('click',function(){\n      root.querySelectorAll('.tab').forEach(function(x){x.classList.remove('active');});\n      root.querySelectorAll('.tabpanel').forEach(function(x){x.classList.remove('active');});\n      t.classList.add('active');\n      var p=root.querySelector('.tabpanel[data-panel=\"'+t.dataset.tab+'\"]'); if(p)p.classList.add('active');\n    });\n  });\n\n  if(root.querySelector('#gkms-analytes')){\n    var A=[\n      {n:'Acid value', d:'The esterification endpoint for alkyds, read from the acid\/ester carbonyl band ratio. 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