ArmaFlex® Ultima
ArmaFlex Ultima is a closed-cell, flexible elastomeric insulation that is UL Listed and Labeled to UL 723 with a Flame Spread Index below 25 and a Smoke Developed Index below 50. It performs across a service temperature range of -50°C to 110°C (-58°F to 230°F) with a declared thermal conductivity as low as 0.039 W/(m·K), providing reliable condensation control and long-term energy efficiency. Built on ArmaPrene™ Technology and identified by its distinctive blue color, it is FM Approved to FM 4924 and compliant with the IMO 2010 FTP Code Part 5, making it Armacell’s best-in-class plenum-rated solution for fire safety among flexible closed-cell elastomeric insulations.
Key Properties
- Thermal Conductivity (Declared, λd): ≤0.039 W/(m·K) at 50°F (10°C) rising to ≤0.044 W/(m·K) at 125°F (52°C) (ASTM C518, EN ISO 13787, EN 12667, EN ISO 8497)
- Water Vapor Permeability: 0.02 perm-inch (7,000 mu) (ASTM E96, Procedure A, EN 12086, EN 13469)
- Service Temperature Range: -50°C to 110°C (-58°F to 230°F) (ASTM C534)
- Fire Performance: UL Listed and Labeled, UL File No. R39561, 25/50 rating — Flame Spread Index less than 25, Smoke Developed Index less than 50 (ASTM E84, UL 723)
- Density: 3 to 6 pounds per cubic foot (48 to 96 kilograms per cubic meter) (ASTM D1667)
- Water Absorption: 0.2% by volume (ASTM C1763, Procedure B)
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- Specifications
- Applications
- General Info
- FAQs
Physical Properties
| Property | Value | Test Method |
| Density | 3 to 6 pounds per cubic foot (48 to 96 kilograms per cubic meter) | ASTM D1667 |
Thermal Properties
| Property | Value | Test Method |
| Service Temperature Range | Min. -50°C (-58°F) to Max. 110°C (230°F) | ASTM C534 |
| Maximum Temperature, 100% Sheet/Roll Insulation Bonding | 180°F (82°C) | — |
| Declared Thermal Conductivity (λd), 50°F (10°C) | ≤0.039 W/(m·K); k ≤0.270 Btu·in/(h·ft²·°F) | ASTM C518, EN ISO 13787, EN 12667, EN ISO 8497 |
| Declared Thermal Conductivity (λd), 75°F (24°C) | ≤0.040 W/(m·K); k ≤0.276 Btu·in/(h·ft²·°F) | ASTM C518, EN ISO 13787, EN 12667, EN ISO 8497 |
| Declared Thermal Conductivity (λd), 100°F (38°C) | ≤0.042 W/(m·K); k ≤0.288 Btu·in/(h·ft²·°F) | ASTM C518, EN ISO 13787, EN 12667, EN ISO 8497 |
| Declared Thermal Conductivity (λd), 125°F (52°C) | ≤0.044 W/(m·K); k ≤0.302 Btu·in/(h·ft²·°F) | ASTM C518, EN ISO 13787, EN 12667, EN ISO 8497 |
| R-Value, Tube, 1/2″ (13 mm) Wall (ID range 1/2″ to 1-3/8″) | 3.0 to 3.5 | — |
| R-Value, Tube, 1″ (25 mm) Wall (ID range 1/2″ to 6″ IPS) | 5.4 to 6.4 | — |
| R-Value, Sheet/Roll, 1/2″ (13 mm) Thickness | 2.0 | — |
| R-Value, Sheet/Roll, 1″ (25 mm) Thickness | 4.2 | — |
Flame & Fire Performance
| Property | Value | Test Method |
| Surface Burning Characteristics | UL Listed and Labeled, UL File No. R39561, 25/50 rating; Flame Spread Index less than 25; Smoke Developed Index less than 50 | ASTM E84, UL 723 |
| Surface Spread of Flame | Meets requirements of Electric Boat (EB) 4013 and MIL PRF 32514 | EB 4013, MIL PRF 32514 |
| Hot Surface Performance | Meets requirements at 250°F (121°C) | ASTM C411 |
| Surface Flammability | Low-flammable per 2010 FTP-Code (MED 96/98/EC, Module D) | IMO 2010 FTP Code, Part 5 |
| FM Approved | Meets requirements | FM 4924 |
| UL94 5VA | Meets requirements for thicknesses greater than 3 mm | — |
| UL94 V-0 | Meets requirements for thicknesses greater than 3 mm | — |
Environmental Performance
| Property | Value | Test Method |
| Water Vapor Permeability | 0.02 perm-inch (7,000 mu) | ASTM E96, Procedure A, EN 12086, EN 13469 |
| Water Absorption | 0.2% by volume | ASTM C1763, Procedure B |
| UV Resistance | Requires protection against UV radiation; must be protected with 2 coats of ArmaFlex WB Finish or weather-resistant cladding | — |
| Fungal Growth | Pass, no growth | ASTM G21, ASTM C1338 |
Compliance
- UL Classified for UL 723, 25/50 Rating — Compliant (UL File No. R39561)
- FM 4924 — Approved
- IMO 2010 FTP Code Part 5 — Compliant
- ASTM C534, Type I – Tube, Grade 1 — Compliant
- ASTM C534, Type II – Sheet, Grade 1 — Compliant
- Meets IMO SOLAS Requirements — Compliant
- Conforms to ASHRAE 90.1 Energy Standards — Compliant
- Title 24 California Building Energy Efficiency Standards — Compliant
- Conforms to International Residential Code (IRC) — Compliant
- Conforms to International Energy Conservation Code (IECC) — Compliant
- Conforms to International Mechanical Code (IMC) — Compliant
- Meets EB 4013/MIL PRF 32514 Fire Performance Criteria — Compliant
- ASTM E84, UL 723 — Compliant
- ASTM G21/ASTM C1338 — Compliant (Fungal Resistance)
- Lloyd’s Register Type Approval — Compliant (IMO A.653(16), IMO FTPC Part 5)
- GREENGUARD Gold Certified
- ISO 9001 — Compliant (Armacell North America’s quality management systems, certified by Intertek)
- Made with EPA Registered MICROBAN® Antimicrobial Product Protection
- Manufactured Without CFCs, HFCs, HCFCs, PBDEs, or Formaldehyde
- Pipe insulation for condensation prevention and heat loss reduction
- Tank and vessel insulation for thermal and moisture protection
- HVAC system insulation for energy efficiency
- Refrigeration equipment insulation
- Process equipment insulation to support carbon emission reduction
Common industries: HVAC, refrigeration, process equipment, marine, and commercial/residential construction.
ArmaFlex Ultima is a closed-cell, flexible elastomeric insulation engineered for HVAC, refrigeration, and process equipment applications where fire performance and low smoke generation are critical selection criteria. Built with Armacell’s ArmaPrene™ Technology, it is designed to insulate pipes, tanks, vessels, and equipment for the prevention of condensation and heat loss while supporting reduction of carbon emissions. Its closed-cell structure delivers a combination of low water vapor permeability and consistent thermal performance across a wide operating temperature range, positioning it as the highest fire-safety standard within Armacell’s flexible closed-cell elastomeric insulation offering.
Beyond its thermal and fire performance, ArmaFlex Ultima is manufactured without CFCs, HFCs, HCFCs, PBDEs, or formaldehyde, and incorporates EPA-registered MICROBAN® antimicrobial product protection. It passes fungal growth testing with no growth observed, and its low water absorption supports long-term dimensional and thermal stability in condensation-control applications. The product requires UV protection in exposed installations — either two coats of ArmaFlex WB Finish or a weather-resistant cladding — and joints must be sealed with ArmaFlex adhesives for optimal performance. Compliant with UL 723 (UL File No. R39561, 25/50 rating), FM 4924, ASTM C534 (Type I – Tube, Grade 1 and Type II – Sheet, Grade 1), ASTM E84, ASTM C1763, ASTM D1667, ASTM G21/ASTM C1338, IMO 2010 FTP Code Part 5, IMO SOLAS, ASHRAE 90.1, Title 24 California Building Energy Efficiency Standards, the International Energy Conservation Code (IECC), International Residential Code (IRC), International Mechanical Code (IMC), EB 4013/MIL PRF 32514, Lloyd’s Register Type Approval, and ISO 9001 (Armacell North America’s quality management systems, certified by Intertek).
What differentiates ArmaFlex Ultima from other flexible closed-cell elastomeric insulations?
ArmaFlex Ultima is built with ArmaPrene™ Technology and is UL Classified as to UL 723 at a 25/50 rating with ultra-low smoke density, in addition to being FM Approved to FM 4924. This combination sets it apart as Armacell's best-in-class plenum-rated solution, delivering the highest standard of fire safety among flexible closed-cell elastomeric insulations while retaining the distinctive blue color used for field identification.
Why does thermal conductivity matter when selecting ArmaFlex Ultima?
Thermal conductivity determines how effectively the insulation limits heat gain or loss and controls surface condensation on pipes, tanks, vessels, and equipment. ArmaFlex Ultima's declared thermal conductivity ranges from ≤0.039 W/(m·K) at 50°F (10°C) to ≤0.044 W/(m·K) at 125°F (52°C), allowing accurate R-value and energy-efficiency calculations across the product's mean temperature range.
What is the service temperature range for ArmaFlex Ultima?
ArmaFlex Ultima is rated for a service temperature range of -50°C (-58°F) minimum to 110°C (230°F) maximum per ASTM C534. For 100% sheet/roll insulation bonding, the maximum temperature is 180°F (82°C), and for applications below -50°C (-58°F), Armacell's technical team should be contacted.
Is ArmaFlex Ultima suitable for fire-rated and marine-regulated environments?
Yes. ArmaFlex Ultima is UL Classified to UL 723 (UL File No. R39561, 25/50 rating), FM Approved to FM 4924, and compliant with the IMO 2010 FTP Code Part 5 and IMO SOLAS requirements, and it carries Lloyd's Register Type Approval (IMO A.653(16), IMO FTPC Part 5), supporting use in plenum, marine, and other fire- and smoke-regulated installations.
How should ArmaFlex Ultima be specified?
Specify grade (ArmaFlex Ultima), form (pipe, sheet/roll, or tape), wall thickness, compliance requirements, dimensional tolerances, and finished format.
