Coatings Comparison
Cool Touch vs Cellular Glass Insulation: Two Honest Answers to CUI
Both Cool Touch and cellular glass legitimately solve corrosion under insulation, but Cool Touch wins on hot-side service (≤350°F) at a fraction of the cost, while cellular glass remains the only answer for cryogenic, vapor-tight, and load-bearing duty.
Cellular glass and Cool Touch attack the same enemy — water against hot steel — from opposite directions. Cellular glass is exclusion by mass: rigid blocks of 100% closed glass cells form a vapor-tight fortress that admits neither liquid water nor vapor, across a service envelope from -450°F to +900°F. It bears structural load, shrugs off fire, and in cryogenic and dual-temperature service it isn't merely better than a coating — it's the only conversation.
Cool Touch is elimination by film: a seamless ICP™ elastomeric barrier (~0.05 W/m·K, emissivity above 0.88) that resists corrosion outright (ISO 9227 salt spray, 720 hours, Rating 0; ISO 6270-1 condensation, Rating 0) when applied over an approved primer, leaves the steel visually inspectable, and is independently tested to NACE TM21423 for personnel-protection touch-safety. A single 40-mil coat achieves cool-touch conditions to 275°F substrates (manufacturer spec). It applies live to 200°F, removing the shutdown that glass-block installation always requires.
The split is service temperature. Cellular glass is the priciest rigid insulation in the book ($20–50/linear foot installed), brittle, heavy, joint-dependent, and strictly shutdown-installed — a rational premium below ambient. In the ordinary 150–350°F band where most burn-hazard and CUI exposure actually lives, Cool Touch delivers the same CUI outcome at roughly 40% under thick-film coatings and a small fraction of glass systems. The sections below cover where each wins, including the hybrid where the two belong together.
Quick verdict
Best for
Cool Touch (Insulative Coat)
- Hot-side (≤350°F) personnel protection and CUI control at a fraction of the cost
- Live-equipment application to 200°F — glass block is shutdown work, always
- Complex geometry: cellular glass is rigid, brittle, and joint-dependent
- Lightweight retrofit on racks and structures not sized for heavy block
- Visual-inspection programs (film leaves steel observable)
Best for
Cellular Glass
- Cryogenic and dual-temperature service (-450°F capability) — no coating plays here
- Load-bearing insulation at supports and tank bases
- Vapor-tight below-ambient systems where its sealed-cell physics is the whole point
Cool Touch vs cellular glass (side by side)
| Attribute | Cool Touch (NanoTech) | Cellular Glass Block |
|---|---|---|
| CUI strategy | Eliminate the system: seamless corrosion-resistant film (over an approved primer on carbon steel), nothing to trap water, steel inspectable | Seal the system: 100% closed glass cells admit no liquid water |
| Where each is vulnerable | Substrate >350°F is out of range | Joints and adhesive lines — the block is tight; the assembly has seams |
| k-value | ~0.05 W/m·K + emissivity above 0.88 | 0.036–0.050 W/m·K; R-2.8–3.5/inch |
| Personnel protection @ ~275°F | 40-mil single coat (manufacturer spec); TM21423-tested for touch-safety | 2–3 inches + jacketing |
| Cost position | ~40% below thick-film coatings; small fraction of glass systems | Most expensive rigid insulation: $20–50/lf installed |
| Weight | Ounces/ft² | Heavy block; real structural load |
| Fragility | Elastomeric; abrasion-tolerant | Brittle — breaks in handling, waste at every access |
| Install on live equipment | Yes, to 200°F | No — shutdown plus adhesive cure |
| Temperature range | Hot side to 350°F substrate | -450°F to +900°F |
| Load-bearing | No | Yes — supports, shoes, tank bases |
| Standards | NACE TM21423, ISO 9227/6270-1/12944 | ASTM C552 |
k-value: Cellular glass thermal conductivity per ASTM C552 and manufacturer datasheets (FOAMGLAS), which report roughly 0.038–0.055 W/m·K depending on mean temperature.
Temperature range: Cellular glass service range per manufacturer datasheets (FOAMGLAS: -450°F to +900°F / -268°C to +482°C), product covered by ASTM C552.
Standards: ASTM C552 is the standard specification for cellular glass thermal insulation; NACE TM21423 (AMPP) is the personnel-protection touch-temperature test method for insulative coatings.
Which approach is right for your use case?
Hot process piping, 150–350°F, coastal humidity
Pick: Cool Touch (NanoTech)Both end the wet-insulation corrosion story; one does it without shutdown, block-cutting, adhesives, jacketing, or the glass-system price tag. A spray film with Rating-0 salt-spray and condensation results delivers the CUI outcome at hot-side service for a fraction of the installed cost.
LNG or cryogenic dual-temperature service
Pick: Cellular Glass BlockNo contest and no pretense: below-ambient and cryo systems are sealed-cell territory, where vapor drive would destroy permeable systems and coatings have no mission. This is what cellular glass was invented for.
Tank base and load-bearing course
Pick: Cellular Glass BlockThe block carries compressive load that no film can. Standard hybrid: rigid load-bearing inserts (cellular glass or calcium silicate) at the bearing course, Cool Touch up the shell — confining the moisture-trap block to where load demands it while the film covers the rest.
Burn-safety retrofit on equipment that can't shut down
Pick: Cool Touch (NanoTech)Glass block installation is a planned-outage activity by nature (rigid sections, adhesives, jacketing). Cool Touch closes the burn-hazard finding on live surfaces to 200°F: a single 40-mil coat achieves cool-touch conditions to 275°F substrates (manufacturer spec), with personnel-protection touch-safety independently tested to NACE TM21423.
Nozzle-dense exchanger and vessel cluster
Pick: Cool Touch (NanoTech)Rigid brittle block meets curved, interrupted geometry: the result is joints — many — each an adhesive line in the system's armor, plus breakage waste. A film has no joints and follows every curve.
Below-ambient chilled-water system sweating in a humid plant
Tie / dependsCondensation control is genuinely shared ground: Cool Touch reduces or eliminates surface condensation (its design mission includes persistent-condensation areas), while cellular glass owns deep-cold vapor-tight duty. Service temperature decides: mildly-below-ambient favors the film's economics; seriously cold favors the glass.
Where cellular glass is the better pick
Cellular glass solves CUI with physics no liquid can match below ambient: millions of hermetically sealed glass cells that admit neither water nor vapor, across a service envelope from -450°F to +900°F. It bears structural load, shrugs off fire, and in cryogenic and dual-temperature service it isn't merely better than a coating — it's the only conversation. Its CUI record in coastal plants is the best of any rigid insulation, which is exactly why owners pay its premium.
The premium is steep: the most expensive rigid insulation in the book ($20–50/linear foot installed), brittle enough that handling and maintenance access generate constant breakage waste, heavy enough to matter structurally, joint-dependent (the cells are sealed; the assembly's adhesive lines and jacketing are not), and strictly shutdown-installed. Above ambient — in the ordinary 150–350°F band where most burn-hazard and CUI exposure actually lives — it's a costly way to buy an outcome a film delivers for a fraction.
How the technologies differ
Cellular glass is exclusion by mass: rigid blocks of sealed glass cells form a vapor-tight fortress around the pipe, performance bought in inches, joints managed with adhesives, everything hidden under jacketing. Engineering for the extremes — deep cold, heavy load — is where that architecture is irreplaceable.
Cool Touch is elimination by film: a seamless ICP™ elastomeric barrier that suppresses conduction (~0.05 W/m·K), radiates absorbed heat (emissivity above 0.88), resists corrosion outright (ISO 9227 salt spray, 720 hours, Rating 0; ISO 6270-1 condensation, Rating 0) when applied over an approved primer, and leaves the steel inspectable for the life of the asset. Independent NACE TM21423 testing confirms personnel-protection touch-safety — at a 239°F substrate, a 41-mil coat held its surface to 118°F, below the 58°C contact-safety threshold; a single 40-mil coat achieves cool-touch conditions to 275°F substrates (manufacturer spec). Live application to 200°F removes the shutdown from the equation entirely. Same enemy — water against hot steel — two architectures: build the vault, or make the surface itself the protection.
Related pages
Cool Touch product page
Full product spec, test data, application surfaces, and downloadable Technical Manual / TDS / SDS for the Insulative Coating System.
Cool Touch vs Mineral Wool & Jacketing
How the seamless ICP™ film compares to traditional mineral wool plus jacketing on CUI, install labor, and personnel-burn protection.
Cool Touch vs Aerogel Blankets
Spray-applied coating versus aerogel blanket insulation: thickness, cost, and where each wins on hot-side and below-ambient service.
Cool Touch vs Calcium Silicate Insulation
Elastomeric film versus rigid calcium silicate block for high-temperature pipe and equipment insulation and CUI control.
Frequently asked questions
Both prevent CUI — what's actually different?
Can Cool Touch replace cellular glass on cold systems?
Why is cellular glass so expensive?
What happens at pipe supports if we use Cool Touch?
Which gives better burn protection per dollar?
Solve CUI without buying the fortress
Send us your service temperatures and line list. We'll spec the film where it wins, the glass where it's irreplaceable, and the hybrid where the two belong together.