ArmaGel® HTF
ArmaGel® HTF is a flexible silica-aerogel blanket engineered for passive fire protection, compliant with ASTM C1728 Type III, Grade 1A, UL 1709, and ISO 22899-1, available in a single standard thickness of 10 mm (0.4″) in rolls 1.5 m (59″) wide. It achieves 120 minutes of fire protection per UL 1709 and 90 minutes per jet fire per ISO 22899-1 in tested configurations, with a maximum operational temperature of 650°C (1200°F) per ASTM C411 and ASTM C447, and a declared thermal conductivity of 0.021 W/(m·K) (0.14 Btu-in/h-ft²-°F) at 24°C (75°F) per ASTM C177, measured under a load of 1.5 kPa (0.22 psi).
Key Properties
- Thermal Conductivity @ 24°C (75°F): 0.021 W/(m·K) / 0.14 Btu-in/(h-ft²-°F) (ASTM C177)
- Operating Temperature Maximum: 650°C (1200°F) (ASTM C411, ASTM C447)
- Fire Protection Rating — UL 1709: 120 minutes (tested configurations — see Specifications)
- Fire Protection Rating — ISO 22899-1 Jet Fire: 90 minutes (tested configurations — see Specifications)
- Compressive Strength @ 10% Compression: ≥ 3 psi / 20.7 kPa (ASTM C165)
- Flame Spread Index / Smoke Developed Index: ≤ 5 / ≤ 10 (ASTM E84)
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- Specifications
- Applications
- General Info
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Physical Properties
| Property | Value | Test Method |
| Material Type | Silica-aerogel blanket | — |
| Product Color Range | Gray | — |
| Product Range | Sheets in rolls — 10 mm (0.4 in) thickness; width 1.5 m (59 in) | — |
| Shelf Life | Max. 3 years | — |
| Storage | Store indoors, clean and dry conditions, away from direct sunlight | — |
| Health Aspects | Neutral, asbestos free | — |
Mechanical Properties
| Property | Value | Test Method |
| Compressive Strength | ≥ 3 psi / 20.7 kPa at 10% compression | ASTM C165 |
| Flexibility of Mineral Fiber Blankets | Flexible | ASTM C1101 |
| Linear Shrinkage Under Soaking Heat | <2% in width and length / Pass | ASTM C356 |
Thermal Properties
| Property | Value | Test Method |
| Operating Temperature (Max.) | 650°C (1200°F) | ASTM C411, ASTM C447 |
| Hot Surface Performance | Pass | ASTM C411 |
| Thermal Conductivity @ 24°C (75°F) | 0.021 W/(m·K) / 0.14 Btu-in/(h-ft²-°F) | ASTM C177 |
| Thermal Conductivity @ 38°C (100°F) | 0.022 W/(m·K) / 0.15 Btu-in/(h-ft²-°F) | ASTM C177 |
| Thermal Conductivity @ 93°C (200°F) | 0.023 W/(m·K) / 0.16 Btu-in/(h-ft²-°F) | ASTM C177 |
| Thermal Conductivity @ 149°C (300°F) | 0.025 W/(m·K) / 0.18 Btu-in/(h-ft²-°F) | ASTM C177 |
| Thermal Conductivity @ 204°C (400°F) | 0.029 W/(m·K) / 0.20 Btu-in/(h-ft²-°F) | ASTM C177 |
| Thermal Conductivity @ 260°C (500°F) | 0.032 W/(m·K) / 0.22 Btu-in/(h-ft²-°F) | ASTM C177 |
| Thermal Conductivity @ 316°C (600°F) | 0.036 W/(m·K) / 0.25 Btu-in/(h-ft²-°F) | ASTM C177 |
| Thermal Conductivity @ 371°C (700°F) | 0.043 W/(m·K) / 0.30 Btu-in/(h-ft²-°F) | ASTM C177 |
*Measured under a load of 1.5 kPa (0.22 psi). For temperatures above those published, contact Technical Services. For operating temperatures above 400°C (752°F), a metallic foil barrier of 0.05 mm (0.002 in) thickness must be additionally installed.
Flame & Fire Performance
| Property | Value | Test Method |
| Surface Burning Characteristics | Flame spread index ≤ 5 / Smoke developed index ≤ 10 | ASTM E84 |
Fire Resistance — Tested Configurations (UL 1709 & ISO 22899-1)
| Tested Configuration | Fire Rating (min.) | Outer Diameter (mm) | Wall Thickness (mm) | HP/A Value (m⁻¹) | ArmaGel HTF (mm) |
| UL 1709 Compliance | |||||
| Pipe 8″ | 120 | 219.1 | 3.68 | 276.4 | 10 × 10 mm |
| Pipe 8″ | 120 | 219.1 | 6.3 | 163.4 | 7 × 10 mm |
| Pipe 8″ | 120 | 219.1 | 14.2 | 74.8 | 4 × 10 mm |
| Pipe 8″ | 90 | 219.1 | 6.3 | 163.4 | 5 × 10 mm |
| Standard Steel Beam W10×49 (in × lb/ft) | 120 | — | — | 177.3 | 3 × 10 mm |
| Jet Fire Compliance (ISO 22899-1) | |||||
| Pipe 8″ | 90 | 219.1 | 6.3 | 163.4 | 5 × 10 mm |
Environmental Performance
| Property | Value | Test Method |
| Hydrophobic | Yes | — |
| Water Absorption | ≤ 8% by weight | ASTM C1763 |
| Water Vapor Sorption | ≤ 5% by weight | ASTM C1104 |
| Corrosiveness of Steel | Passed — MLCR not exceeding that of 5 ppm chloride solution on carbon steel coupon | ASTM C1617, Procedure A |
| Stress Corrosion Cracking | Insulation for use over austenitic steel: no cracks, passed | ASTM C692, ASTM C795 |
| Fungal Growth | No growth | ASTM C1338 |
Compliance
- ASTM C1728, Type III, Grade 1A — Compliant
- UL 1709 — Compliant (120-minute fire protection in tested configurations)
- ISO 22899-1 — Compliant (90-minute jet fire protection in tested configurations)
- ASTM C165 — Compliant (Compressive Strength ≥ 3 psi at 10% compression)
- ASTM C356 — Compliant (Linear Shrinkage Under Soaking Heat: <2% in width and length)
- ASTM C411 — Compliant (Hot Surface Performance: Pass; Operating Temperature Max.: 650°C)
- ASTM C447 — Compliant (Operating Temperature Max.: 650°C)
- ASTM C692 / ASTM C795 — Compliant (Stress Corrosion Cracking: no cracks, passed)
- ASTM C1101 — Compliant (Flexibility of Mineral Fiber Blankets: Flexible)
- ASTM C1104 — Compliant (Water Vapor Sorption: ≤ 5% by weight)
- ASTM C1338 — Compliant (Fungal Growth: No growth)
- ASTM C1617, Procedure A — Compliant (Corrosiveness of Steel: Passed)
- ASTM C1763 — Compliant (Water Absorption: ≤ 8% by weight)
- ASTM E84 — Compliant (Flame spread index ≤ 5 / Smoke developed index ≤ 10)
- Passive fire protection of 8″ pipes in hydrocarbon pool fire (UL 1709) environments requiring 120-minute fire ratings at HP/A values from 74.8 to 276.4 m⁻¹
- Jet fire protection of 8″ pipes per ISO 22899-1 requiring 90-minute ratings at HP/A 163.4 m⁻¹
- Passive fire protection of structural steel beams (W10×49) requiring 120-minute UL 1709 ratings
- Thermal insulation in energy and industrial process facilities requiring combined PFP and CUI protection in a single flexible blanket
- Offshore oil and gas facility insulation of pipes, vessels, ducts, elbows, fittings, and flanges requiring both passive fire protection and superior thermal performance
Common industries: Oil and gas, offshore, petrochemical, energy, power generation, industrial processing.
ArmaGel® HTF is a silica-aerogel blanket specifically engineered for passive fire protection (PFP) of pipework and equipment in energy, industrial process, and offshore oil and gas facilities. It is the only grade in the ArmaGel® product family designed and tested to UL 1709 (hydrocarbon pool fire) and ISO 22899-1 (jet fire) standards.
Compliant with ASTM C1728 Type III, Grade 1A, it achieves 120 minutes of fire protection per UL 1709 and 90 minutes per ISO 22899-1 jet fire in the tested configurations listed on the TDS — all UL fire tests were conducted at a UL laboratory under full UL witnessing; the jet fire test was conducted at an Efectis/France laboratory under full Efectis and UL witnessing.
Fire rating criteria for jet fire: temperature increase on steel pipe below 538 K over 90 minutes with no integrity failure during the full 180-minute test period. Available in a single standard thickness of 10 mm (0.4″) in roll form 1.5 m (59″) wide; multiple layers are used to achieve various fire ratings across different pipe and beam configurations.
Thermal conductivity is declared at 8 temperature points from 24°C to 371°C, with values provided in both W/(m·K) and Btu-in/(h-ft²-°F), measured under a load of 1.5 kPa (0.22 psi) per ASTM C177. The material is hydrophobic, passes ASTM C1763 water absorption at ≤8% by weight, and provides CUI protection. Corrosiveness of steel passes ASTM C1617 Procedure A with MLCR not exceeding that of a 5 ppm chloride solution on a carbon steel coupon.
Stress corrosion cracking passes ASTM C692 and ASTM C795 for use over austenitic steel. Health aspects are described on the TDS as neutral and asbestos free. Shelf life is maximum 3 years; storage requires indoor, clean and dry conditions away from direct sunlight. For operating temperatures above 400°C (752°F), a metallic foil barrier of 0.05 mm (0.002 in) thickness must be additionally installed per the TDS footnote.
Compliant with ASTM C1728 Type III, Grade 1A; UL 1709; ISO 22899-1; ASTM C411; ASTM C447; ASTM C165; ASTM C356; ASTM C692; ASTM C795; ASTM C1101; ASTM C1104; ASTM C1338; ASTM C1617; ASTM C1763; ASTM E84.
What differentiates ArmaGel® HTF from ArmaGel® HT, HTL, DT, Rail, XGC, and XGH?
ArmaGel® HTF is the only grade in the ArmaGel® product family designed and rated for passive fire protection, carrying both UL 1709 (120-minute hydrocarbon pool fire) and ISO 22899-1 (90-minute jet fire) certifications with tested configurations for 8" pipe and W10×49 structural steel beam.It is also the only grade identified on the TDS as a silica-aerogel blanket (versus generic "aerogel blanket" for other grades), and the only grade available in a single fixed standard thickness (10 mm / 0.4"). Multiple layers are applied to achieve the required fire rating for a given HP/A value and pipe configuration.
Why does thermal conductivity matter when selecting a passive fire protection insulation?
In passive fire protection applications, thermal conductivity determines how effectively the insulation delays heat transfer to the protected substrate during a fire event. ArmaGel® HTF's low declared thermal conductivity — 0.021 W/(m·K) at 75°F rising to 0.043 at 700°F — allows thinner layer counts to achieve the required fire ratings compared to conventional PFP materials, enabling easier installation on complex geometries such as elbows, fittings, and flanges where thick, rigid PFP systems are impractical.
What is the maximum operating temperature for ArmaGel® HTF?
The maximum operating temperature for ArmaGel® HTF is 650°C (1200°F) per ASTM C411 and ASTM C447. The TDS footnote states that for operating temperatures above 400°C (752°F), a metallic foil barrier of 0.05 mm (0.002 in) thickness must be additionally installed.
Is ArmaGel® HTF suitable for regulated and offshore environments?
Yes. ArmaGel® HTF complies with ASTM C1728 Type III Grade 1A, UL 1709, and ISO 22899-1. All UL fire tests were conducted at a UL laboratory under full UL witnessing. The jet fire test was conducted at an Efectis/France laboratory under full Efectis and UL witnessing. It also passes ASTM E84, ASTM C692/C795 (use over austenitic stainless steel), and ASTM C1617 Procedure A for corrosiveness to steel.
How should ArmaGel® HTF be specified?
Specify grade (ArmaGel® HTF), number of layers × 10 mm thickness required for the target fire rating and HP/A value per the tested configuration table, compliance requirements (UL 1709, ISO 22899-1, ASTM C1728 Type III Grade 1A, and others as applicable), dimensional tolerances, and finished format. Consult Armacell application manual(s) for industrial applications.
