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Thermaline Heat Shield

Thermaline Heat Shield

by Carboline
$529.78 - $2,496.62
$529.78
$529.78 - $2,496.62
$529.78

Thermaline Heat Shield is a reinforced inorganic polymeric coating engineered by Carboline for superior protection in hot, cryogenic, cycling, and severe thermal exposures. This versatile coating incorporates plate-like reinforcing pigments in an inert matrix to create a flexible yet robust barrier film with exceptional corrosion resistance, thermal stability, and resistance to harsh corrosives, making it the premier choice for safeguarding piping, vessels, equipment, and steel structures in extreme temperature industrial and process environments.

Thermaline Heat Shield PDS >
Finish: Eggshell
Theoretical Coverage: 164 SF/Gal at 5 mils  •  234 SF/Gal at 3.5 mils
Application Thinner: Carboline Thinner 10 or 236E (normal temps)  •  Thinner 230 (hot surfaces up to 500°F)  •  Max 6% by volume
Cleanup: Carboline Thinner No. 2 or Acetone

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Key Features:

  • Extreme Temperature Resistance: Handles continuous exposure from cryogenic (-321°F / -196°C) to 1200°F (649°C), with excellent performance under thermal cycling and shock.
  • Reinforced Barrier Protection: Plate-like pigments create a flexible, inert matrix film for superior corrosion barrier against chemicals, moisture, and corrosives in elevated temperature settings.
  • Versatile & Flexible: Suitable for insulated and non-insulated surfaces; accommodates substrate movement without cracking; the recommended solution for corrosion under insulation (CUI) per NACE SP0198 CS-6 and SS-5.
  • Self-Priming: Can be applied directly to properly prepared ferrous and stainless steel without a separate primer. May also be applied over Carbozinc 11 zinc primers for uninsulated atmospheric service.
  • Superior Shop Handling: Harder film after ambient cure than standard silicone coatings, reducing damage risk during shop fabrication and shipping.

Common Industry Applications:

  • Oil & Gas / Petrochemical: Piping, vessels, tanks, and equipment under insulation or in high-heat process lines exposed to thermal cycling and potential CUI.
  • Power Generation & Refineries: Hot piping, exhaust systems, boilers, and steel structures in elevated temperature environments requiring corrosion and thermal protection.
  • Cryogenic & Industrial Processing: LNG facilities, chemical plants, and equipment handling extreme cold-to-hot transitions, including insulated lines and vessels.
  • Stainless Steel Protection: Prevents chloride-induced stress corrosion cracking (SCC) on austenitic stainless steel piping and equipment in industrial environments.

Thermaline Heat Shield is a TWO-COMPONENT SYSTEM (PARTS A & B).

Product type: Reinforced Inorganic Polymeric Coating
Finish: Eggshell
Solids by Volume: 51% ± 2%
DFT per coat: 3.5–5.0 mils  •  Two coats recommended for optimal performance  •  Max total DFT 12 mils
Application Methods: Airless Spray, Conventional Spray, Brush, or Roller
Mix Ratio: 25:1 by volume (Part A to Fortifier HT)  •  Fortifier HT addition optional for field applications to in-situ equipment (heat cure required if omitted — see PDS)
Pot Life: 8 hours at 75°F (24°C)
Max Service Temperature: -321°F (-196°C) cryogenic to 1200°F (649°C)
Compliance: NACE SP0198 CS-6 and SS-5  •  ISO 12944-6 C5-M Medium

Shipping & Delivery: Carboline orders typically ship within 1–2 business days of receipt. Most orders are received within a week. Expedited shipping is NOT available on most orders.
Contact our customer support today to discuss your project:
(800) 567-5358

Size: 1Gal
Color: Gray (0700)
Coverage Calculator
Thermaline Heat Shield is a self-priming extreme temperature coating — no separate primer is required on properly prepared ferrous or stainless steel. It may also be applied over Carbozinc 11 zinc primer for uninsulated atmospheric service. The only approved topcoat is Thermaline 4900 (color variants only — for atmospheric service). No topcoat is needed or recommended for insulated CUI service.

Compatible Thinners

Thinner Application Max Rate
Not normally required Normal spray — thinning not needed —
Thinner 10 › Small areas / brush touch-up at normal temperatures 6% by volume
Thinner 236E Small areas / touch-up — exempt VOC thinner 6% by volume
Thinner 230 Hot surface applications (up to 500°F / 260°C) 6% by volume
Thinner 2 › Equipment and spray line cleanup only N/A — cleanup only

Thinning is not normally required for spray application. Use of thinners other than those supplied or approved by Carboline will void the product warranty.

Recommended Coating Systems

CUI System — Self-Priming, Insulated Carbon or Stainless Steel (NACE SP0198 CS-6 / SS-5)
CUI Barrier — You Are Here Thermaline Heat Shield 2 coats · 3.5–5 mils DFT per coat · self-priming · cryogenic to 1200°F
Atmospheric System — Uninsulated, With Zinc Primer Undercoat
Zinc Primer Carbozinc 11 inorganic zinc · galvanic protection · up to 750°F
→
High-Temp Barrier — You Are Here Thermaline Heat Shield 2 coats · 3.5–5 mils DFT per coat
Atmospheric System — With Color Topcoat (Uninsulated Service Only)
High-Temp Barrier — You Are Here Thermaline Heat Shield 2 coats · 3.5–5 mils DFT per coat
→
Color Topcoat Thermaline 4900 (color variants) up to 525°F · color and UV stability · not Aluminum variant
Full System — Zinc Primer + Heat Shield + Color Topcoat (Atmospheric, Uninsulated)
Zinc Primer Carbozinc 11 galvanic protection
→
High-Temp Barrier — You Are Here Thermaline Heat Shield 3.5–5 mils DFT
→
Color Topcoat Thermaline 4900 (color variants) color / UV stability

Frequently Purchased Together

Carboline Thinner No. 10 — touch-up and brush thinner for Thermaline Heat Shield
Carboline Thinner No. 10
Touch-up and brush application thinner for Thermaline Heat Shield at normal temperatures. Max 6% by volume.
From $125.25 / gal
Shop Now
Carboline Thinner No. 2 — equipment cleanup for Thermaline Heat Shield
Carboline Thinner No. 2
Spray equipment and tool cleanup after Thermaline Heat Shield application. Also acceptable for cleanup after Fortifier HT mixing.
From $129.87 / gal
Shop Now
Carbozinc 11 inorganic zinc primer — used under Thermaline Heat Shield for uninsulated atmospheric service
Carbozinc 11
Inorganic zinc primer for use under Thermaline Heat Shield on uninsulated atmospheric service. Rated to 750°F — the only Carboline zinc primer approved with Heat Shield.
From $292.27 / gal kit
Shop Now
Thermaline 450 glass-flake epoxy novolac CUI coating — related Thermaline series product
Thermaline 450
Glass-flake epoxy novolac CUI coating for service up to 450°F. An alternative Thermaline series option for lower-temperature CUI applications (NACE SP0198 CS-1 through CS-4 / SS-1 through SS-3).
From $602.38 / 1-gal kit
Shop Now

Thermaline Heat Shield Extreme Temperature CUI Coating by Carboline

Thermaline Heat Shield — Extreme Temperature CUI Coating

Thermaline Heat Shield — Reinforced Inorganic Polymer Coating by Carboline.
Engineered for the most demanding thermal environments — from cryogenic −321°F (−196°C) to 1200°F (649°C). Incorporates plate-like reinforcing pigments in an inert polymeric matrix to deliver outstanding barrier protection against corrosion under insulation (CUI) on carbon steel and stainless steel. Self-priming. Two-component system with optional Fortifier HT (Part B).

✓ NACE SP0198 CS-6 & SS-5  •  ✓ ISO 12944-6 C5-M Medium  •  ✓ −321°F to 1200°F Service  •  ✓ Self-Priming

✏️ Need a project quote? Request Online

📞 Questions? Call (800) 567-5358 — Mon–Fri 8AM–5PM EST

Thermaline Heat Shield by Carboline

Thermaline Heat Shield extreme temperature coating by Carboline applied to industrial piping
Thermaline Heat Shield — Extreme Temperature CUI Coating, 1 and 5-Gallon Kits

Shipping Map — Carboline Delivery Timing

Carboline US regional warehouse shipping map showing typical delivery transit zones by destination
Typical transit times vary by destination zone.

Shipping & Availability

Call (800) 567-5358 for pricing and logistics questions.

Thermaline Heat Shield ships from Carboline regional warehouses nearest to your location. Each kit includes Part A (base) and Part B (Fortifier HT).

Most orders ship within 2–3 business days. Transit times vary by destination zone.

Kit sizes: 1.04-gallon kit  •  5.2-gallon kit (actual volumes including Fortifier HT)

Colors: 0700 Metallic Aluminum Grey  •  J700 Metallic Grey

Technical Specifications

PropertyValue
Generic TypeReinforced Inorganic Polymer
FinishMetallic / Matte
Standard Colors0700 Metallic Aluminum Grey · J700 Metallic Grey
Solids by Volume51%
Mix Ratio25:1 by volume (Part A : Part B / Fortifier HT). Add 5.12 oz Fortifier HT per gallon of Part A.
Pot Life8 hours at 75°F (24°C) — reduced at higher temperatures
Recommended DFT3.5–5.0 mils (89–127 microns) per coat · 2 coats recommended · Max 12 mils total
Coverage @ 3.5 mils234 ft²/gal theoretical · ~187 ft²/gal practical (airless). Reference: 818 ft²/gal @ 1 mil.
Coverage @ 5.0 mils164 ft²/gal theoretical · ~131 ft²/gal practical (airless)
Temperature Range−321°F (−196°C) cryogenic to 1200°F (649°C) high heat
PrimerSelf-priming on ferrous and stainless steel. May be applied over Carbozinc 11 for uninsulated atmospheric service.
TopcoatsThermaline 4900 and 4900 VOC color variants only — atmospheric service only. Do not use 4900 Aluminum or 4900 VOC Aluminum as topcoats.
CleanupThinner 2 or Acetone
Min App Temp55°F (13°C) material · 50°F (10°C) surface. Substrate must be above dew point.
Flash Point — Part A80°F (27°C) — flammable at ambient temperature
CertificationsNACE SP0198 CS-6 & SS-5 · ISO 12944-6 C5-M Medium
Shelf Life12 months at 75°F (24°C) in original sealed containers
Storage40°–120°F (4°–49°C) · Store indoors
Kit Sizes1.04-gallon kit · 5.2-gallon kit (actual volumes incl. Fortifier HT)

Source: Carboline Thermaline Heat Shield PDS (June 2025, doc 0361).

Substrates, Surface Prep & Applications

Surface Preparation

All surfaces must be cleaned per SSPC-SP1 solvent cleaning before the primary prep method.

SubstrateRequirement
Carbon SteelSSPC-SP10 Near-White Blast · 1–3 mil angular profile. Where blasting is impractical: SSPC-SP11 or SP15 to achieve 1–2 mil profile.
Stainless SteelSSPC-SP16 · 1–3 mil angular profile via abrasive blasting. Remove all embedded iron and chlorides. Use SSPC-SP11 for repairs.

Typical Applications

ApplicationDetails
CUI (Corrosion Under Insulation)Primary use. Carbon steel and SS pipe/equipment under insulation, cryogenic to 1200°F. Meets NACE SP0198 CS-6 and SS-5.
Cryogenic ServiceRated to −321°F (−196°C). LNG piping, cryogenic vessels, equipment cycling extreme cold to ambient.
High-Temp Piping & VesselsRefinery, petrochemical, power plant piping, boilers, heat exchangers up to 1200°F (649°C).
Stainless Steel Chloride ProtectionPrevents chloride-induced stress corrosion cracking (SCC) on austenitic SS in industrial environments.
Atmospheric / UninsulatedOver Carbozinc 11 zinc primer where corrosion protection and heat resistance are both required.

Mixing Instructions

Step 1: Power mix Part A base component until uniform.

Step 2: Add Part B (Fortifier HT) at 25:1 by volume (5.12 oz per gallon of Part A) and mix to uniformity.

Pot life: 8 hours at 75°F. Reduced at higher temperatures.

Field application: For in-situ field applications, Fortifier HT is optional. If omitted, the coating must be heat cured per the Thermaline Heat Shield Application Guide before handling. Skipping both Fortifier HT and heat cure produces an under-cured film unsuitable for service.

Curing Schedule

Based on 3.5–5.0 mil DFT. Typical dry-to-ship time is 24 hours.

Surface Temp. Dry to Touch Dry to Recoat Dry to Handle
50°F (10°C)1 hour6 hours6 hours
60°F (16°C)1 hour3 hours5.5 hours
75°F (24°C)45 min1 hour5 hours
90°F (32°C)30 min1 hour2 hours
Force Cure: Raise substrate temperature slowly to 500°F (260°C) at a maximum rate of 30°F (17°C) per 60 minutes (approx. 7–14 hours total). Hold at 500°F for 2 hours. Avoid rapid temperature excursions during the first heat cycle.

Good to Know Before You Buy

⚠️ Critical Notes
  1. Fortifier HT is required for shop use — optional but conditional for field use. In a shop, always mix Part B at the 25:1 ratio. In the field on in-situ equipment, you may omit it — but only if you then heat cure the coating per the Application Guide. Omitting Fortifier HT without proper heat cure produces a softer, under-cured film that is not suitable for service.
  2. Never exceed 12 mils total DFT. Two coats at 3.5–5.0 mils per coat is the correct system. Excessive film thickness causes premature failure. Do not try to build up coverage in fewer, thicker coats.
  3. Part A flash point is 80°F (27°C) — flammable at ambient temperature. Keep away from sparks and open flames during application and until fully cured. Follow all electrical grounding requirements per the National Electric Code.
  4. The first heat cycle must be gradual. When placing coated equipment into service, raise temperature slowly — no more than 30°F (17°C) per hour. Rapid temperature excursions during the first heat cycle can damage the film. For force cure: ramp to 500°F at max 30°F per 60 minutes, then hold 2 hours.

Frequently Asked Questions — Thermaline Heat Shield

What temperature range can Thermaline Heat Shield handle?
Thermaline Heat Shield handles thermal cycling from cryogenic −321°F (−196°C) to 1200°F (649°C). It is specifically designed for equipment and piping that cycles across a wide temperature range, including LNG cryogenic service and high-heat refinery and petrochemical applications.
What is the coverage rate?
Based on 51% volume solids. At 3.5 mils: approximately 234 ft²/gal theoretical and ~187 ft²/gal practical (airless spray, ~20% loss). At 5.0 mils: ~164 ft²/gal theoretical / ~131 ft²/gal practical. Two coats are recommended. Keep total DFT below 12 mils.
Is Fortifier HT (Part B) required?
For shop applications: yes — always mix Fortifier HT at 25:1 (5.12 oz per gallon). For field applications to in-situ equipment: optional, but if omitted the coating must be heat cured per the Application Guide before handling or returning to service. Skipping both Fortifier HT and heat cure produces an under-cured film unsuitable for service.
Can Thermaline Heat Shield be applied to stainless steel?
Yes — this is one of its key strengths. It specifically protects stainless steels from chloride-induced stress corrosion cracking (SCC). SSPC-SP16 surface preparation with a 1–3 mil angular profile is required. Remove all embedded iron and chloride contamination before application.
Does Thermaline Heat Shield require a primer?
Thermaline Heat Shield is self-priming on properly prepared ferrous and stainless steel. For uninsulated atmospheric service, it may also be applied over Carbozinc 11 zinc primers where galvanic protection is desired.
Can Thermaline Heat Shield be topcoated?
Yes, for atmospheric service only. Approved topcoats: Thermaline 4900 and Thermaline 4900 VOC color variants. Do not use Thermaline 4900 Aluminum or 4900 VOC Aluminum as topcoats over Heat Shield. No topcoat is needed for insulated service.
What kit sizes are available?
Available in 1.04-gallon and 5.2-gallon kits (actual volumes including Fortifier HT). Each kit contains Part A (base component) and Part B (Fortifier HT). Use the coverage table in the Technical Specifications to estimate project quantities and round up.

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