Coatings Comparison
Cool Touch is a water-resistant, seamless film that delivers TM21423-validated touch-safety (ASTM C1055 contact-burn threshold) on 150–350°F surfaces without shutdown or CUI risk, while calcium silicate remains the right pick at load-bearing supports and for service above 350°F to 1,200°F.
Calcium silicate insulates with rigid mineral mass: a crystalline, microporous block (~0.059–0.072 W/m·K across its service range, R-2–2.4/inch per ASTM C533 Type I) cut to fit, jacketed against weather, and demolished to inspect what it covers. Cool Touch is applied as a liquid and cures into a seamless elastomeric barrier — the ICP™ additive suppresses conduction through the film (~0.05 W/m·K) while high emissivity (0.88–0.95) radiates absorbed heat back off the surface.
For personnel protection in the 150–350°F band, the two approaches diverge sharply on the things that actually drive cost and risk. Cool Touch is third-party validated under NACE/AMPP TM21423 to hold a 239°F substrate's touch surface at 118°F with a 41-mil coat, it is water-resistant with Rating-0 corrosion performance (ISO 9227 salt spray, 720 hours; ISO 6270-1 condensation, Rating 0), it installs on live equipment to 200°F, and it conforms to any geometry without a joint. Wet calcium silicate, by contrast, absorbs and holds water against the steel — a documented corrosion engine, and on austenitic stainless a chloride stress-corrosion-cracking risk that jacketing hides.
Calcium silicate keeps two unanswerable arguments: compressive strength at pipe shoes, saddles, and supports, and a 1,200°F service ceiling far beyond any coating's envelope. The honest answer for most plants is a hybrid — rigid inserts at the load points and on the hot core, Cool Touch across the ≤350°F CUI-vulnerable periphery — which eliminates the moisture-holding mass while keeping the structure honest.
Best for
Best for
| Attribute | Cool Touch (NanoTech) | Calcium Silicate + Jacketing |
|---|---|---|
| Form | Spray/brush/roll elastomeric film | Rigid molded block and pipe sections |
| Insulation values | ~0.05 W/m·K film + 0.88–0.95 emissivity | ~0.050–0.072 W/m·K (100–400°F mean); R-2–2.4/inch, falling with temperature |
| Personnel protection build | 40–80 mils DFT (TM21423-validated) | 2–3 inches + jacketing |
| Moisture behavior | Water-resistant film; condensation Rating 0 (ISO 6270-1) | Absorbs and holds water; wet block = corrosion engine |
| Stainless steel risk | No SCC driver — water-resistant film keeps chlorides/moisture off the steel | Wet CaSi linked to chloride SCC on austenitic stainless |
| Weight | Ounces/ft² | Heavy — meaningful load on racks and supports |
| Geometry | Conforms to anything; vertical hangability | Cut-to-fit; gaps and joints at every irregularity |
| Breakage / waste | None — liquid applied | High breakage in handling; demolition waste each access |
| Install on live equipment | Yes, to 200°F surfaces | No — shutdown |
| Compressive strength | Not load-bearing | Load-bearing (like cellular glass) — the legitimate advantage |
| Max service temp | 350°F substrate | 1,200°F |
| Standards | NACE/AMPP TM21423, ISO 9227/6270-1/12944 | ASTM C533 |
Insulation values: Calcium silicate k and R-per-inch per ASTM C533 Type I and published manufacturer datasheets (e.g. Johns Manville Thermo-1200); apparent conductivity rises and R drops as temperature climbs.
Wet calcium silicate against austenitic stainless is a known stress-corrosion-cracking recipe — refineries have the inspection reports to prove it. A water-resistant film with Rating-0 corrosion results sidesteps the chemistry entirely and leaves the stainless visible for integrity checks.
No coating bears structural load — calcium silicate's compressive strength is real and necessary at supports. The smart spec: CaSi inserts at the load points, Cool Touch everywhere between — removing the bulk of the moisture-holding mass while keeping the structure honest.
Rigid block means shutdown, scaffold, two trades, and jacketing. Cool Touch's mist-coat procedure applies to operating surfaces up to 200°F, and a single 40-mil coat is TM21423-validated touch-safe on substrates to 275°F — compliance closed without touching the production calendar.
Above Cool Touch's 350°F substrate ceiling, high-temperature rigid insulation is the correct engineering answer. Use the hybrid logic: rigid systems on the hot core, Cool Touch on the ≤350°F CUI-vulnerable periphery.
Every cut joint in rigid block is a future water path, and complex geometry multiplies joints. A spray film has no joints. It follows the casting like paint because it is one.
Spec inertia is a real cost-benefit factor — retraining, stocking, and warranty frameworks matter. Run a pilot on the worst CUI corridor: the inspection results after the next wet season usually settle the standardization debate on their own.
Calcium silicate has two unanswerable arguments: compressive strength and temperature ceiling. It is the insulation that holds up the pipe — at shoes, saddles, and supports, nothing else in the category carries load the same way — and it serves continuously to 1,200°F, far beyond any coating's envelope. North American formulations also buffer corrosion with alkaline chemistry and low chloride content, a genuine mitigation when the block stays dry. For high-temperature units and structural insulation points, it remains the specified standard for good reasons.
Its liabilities arrive with water. CaSi absorbs moisture readily, holds it against the steel, and when wet has been implicated in both accelerated carbon-steel corrosion (in some conditions) and chloride stress-corrosion cracking on stainless — while jacketing hides the evidence. It's heavy, breaks in handling, generates demolition waste at every maintenance access, and turns nozzle-rich geometry into a jigsaw of joints. As with mineral wool, the raincoat-over-sponge architecture is the root problem; calcium silicate just adds weight and fragility to it.
Calcium silicate insulates with rigid mineral mass — a crystalline, microporous block whose R-value comes by the inch and whose service ceiling (1,200°F) and compressive strength define its niche. It must be cut to fit, jacketed against weather, and demolished to inspect what it covers.
Cool Touch is applied as a liquid and cures into a seamless elastomeric barrier. The ICP™ additive suppresses conduction through the film (~0.05 W/m·K) while high emissivity (0.88–0.95) radiates absorbed heat back off the surface — third-party validated under NACE/AMPP TM21423 to hold a 239°F substrate's touch surface at 118°F with a 41-mil coat. It is water-resistant with Rating-0 corrosion performance (ISO 9227 salt spray, 720 hours; ISO 6270-1 condensation, Rating 0), inspectable at a glance, applies to live equipment to 200°F, and conforms to any geometry without a joint. Block builds a wall around the heat; the film teaches the surface itself to shed it.
Full product spec, test data, application surfaces, and downloadable Technical Manual / TDS / SDS for the Insulative Coat system.
Seamless insulating film versus mineral wool batt and jacketing: CUI risk, weight, labor, and inspectability compared.
How the ICP™ coating compares to rigid cellular glass block for moisture resistance, geometry, and installed cost.
ICP™ versus older ceramic-microsphere chemistry: applies faster, thinner, at roughly half the installed cost.
Send us your line list and support layout. We'll mark where calcium silicate's strength is irreplaceable — and where a seamless film saves the steel, the schedule, and the maintenance budget.
