AP/CoilFlex Duct Liner
AP/CoilFlex Duct Liner is a black, fiber-free elastomeric foam duct liner based on synthetic rubber, supplied in roll form with a declared thermal conductivity of λd ≤ 0.036 W/(m·K) at 75°F for 1″ thickness. It is rated for continuous service from -183°C (-297°F) to 104°C (220°F) and carries a 25/50 surface burning rating per ASTM E84. The soft, conformable foam wraps fabricated duct corners without compression while attenuating airborne HVAC noise (NRC 0.60).
Key Properties
- Thermal Conductivity (Declared, λd): ≤ 0.036 W/(m·K) [k ≤ 0.25 Btu·in/(h·ft²·°F)] at 75°F (24°C) for 1″ thickness; up to ≤ 0.040 W/(m·K) [≤ 0.289 Btu·in/(h·ft²·°F)] at 100°F (38°C) for 1-1/2″ thickness — ASTM C518, ASTM C177
- Service Temperature Range: Min. -183°C (-297°F) to Max. 104°C (220°F)
- Surface Burning Characteristics: Flame Spread Index less than 25; Smoke Developed Index less than 50; 25/50 Rated — ASTM E84
- Density: 3 to 6 pounds per cubic foot (48 to 96 kilograms per cubic meter) — ASTM D1667
- Noise Reduction Coefficient (NRC): 0.60 at 1″ (25mm) thickness — ASTM C4232
- R-Value: 4.2 at 1″ (25mm) thickness; 6 at 1-1/2″ (38mm) thickness
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Physical Properties
| Property | Value | Test Method |
| Density | 3 to 6 lb/ft³ (48 to 96 kg/m³) | ASTM D1667 |
Thermal Properties
| Property | Value | Test Method |
| Service Temperature, Min. | -183°C (-297°F) | — |
| Service Temperature, Max. | 104°C (220°F) | — |
| Declared Thermal Conductivity λd, 75°F (24°C), 1″ thickness | ≤ 0.036 W/(m·K) [k ≤ 0.25 Btu·in/(h·ft²·°F)] | ASTM C518, ASTM C177 |
| Declared Thermal Conductivity λd, 100°F (38°C), 1″ thickness | ≤ 0.037 W/(m·K) [k ≤ 0.256 Btu·in/(h·ft²·°F)] | ASTM C518, ASTM C177 |
| Declared Thermal Conductivity λd, 75°F (24°C), 1-1/2″ thickness | ≤ 0.040 W/(m·K) [k ≤ 0.28 Btu·in/(h·ft²·°F)] | ASTM C518, ASTM C177 |
| Declared Thermal Conductivity λd, 100°F (38°C), 1-1/2″ thickness | ≤ 0.040 W/(m·K) [k ≤ 0.289 Btu·in/(h·ft²·°F)] | ASTM C518, ASTM C177 |
| R-Value, 1″ (25mm) thickness | 4.2 | — |
| R-Value, 1-1/2″ (38mm) thickness | 6 | — |
| High-Temperature Surface Performance¹ | Withstands 250°F (121°C) with no evidence of flaming, glowing, smoldering, delamination, melting, or insulation collapse; continuous use temperature limited to 220°F (104°C) | ASTM C411 |
Flame & Fire Performance
| Property | Value | Test Method |
| Flame Spread Index | Less than 25 | ASTM E84 |
| Smoke Developed Index | Less than 50 | ASTM E84 |
| Surface Burning Characteristics Rating | 25/50 Rated | ASTM E84, UL 723 |
Environmental Performance
| Property | Value | Test Method |
| Mold Growth | Pass; built-in MICROBAN antimicrobial additive | ASTM G21, ASTM C1338 |
| Health Aspects | No objectionable odors | ASTM C665 |
| High-Velocity Airflow Resistance | Does not break away, flake off, or show evidence of delamination at velocities of 10,000 ft/min | ASTM C1071 |
Acoustic Performance
| Property | Value | Test Method |
| Sound Absorption Average (SAA), 1″ (25mm) thickness | 0.52 | ASTM C4232 |
| Noise Reduction Coefficient (NRC), 1″ (25mm) thickness | 0.60 | ASTM C4232 |
| Octave Band Sound Absorption Coefficient (α) at 125 Hz, 1″ (25mm) thickness | 0.08 | — |
| Octave Band Sound Absorption Coefficient (α) at 250 Hz, 1″ (25mm) thickness | 0.22 | — |
| Octave Band Sound Absorption Coefficient (α) at 500 Hz, 1″ (25mm) thickness | 1.03 | — |
| Octave Band Sound Absorption Coefficient (α) at 1000 Hz, 1″ (25mm) thickness | 0.37 | — |
| Octave Band Sound Absorption Coefficient (α) at 2000 Hz, 1″ (25mm) thickness | 0.68 | — |
| Octave Band Sound Absorption Coefficient (α) at 4000 Hz, 1″ (25mm) thickness | 0.50 | — |
¹AP CoilFlex Insulation can withstand temperature of 250°F (121°C) when tested according to ASTM C411. Although this insulation will withstand high temperatures, continuous use temperature should be limited to 220°F (104°C).
Compliance
- ISO 9001 — Compliant (Armacell North America’s quality management systems certified by Intertek)
- California Title 24 Building Energy Efficiency Standards — Compliant
- GREENGUARD Gold Certified — Compliant
- International Mechanical Code (IMC) — Compliant
- International Energy Conservation Code (IECC) — Compliant
- International Residential Code (IRC) — Compliant
- ASTM E84 — Compliant
- UL 723 — Compliant
- NFPA 90A — Compliant
- NFPA 90B — Compliant
- Manufactured without CFCs, HFCs, HCFCs, PBDEs, or Formaldehyde — Compliant
- EPA Registered MICROBAN Antimicrobial Product Protection — Compliant (Made with)
- HVAC duct interior thermal and acoustical lining
- Fabricated duct corner wrapping without compression
- Airborne background noise attenuation in HVAC systems
- Indoor air quality (IAQ) protection in ducted air handling systems
- Energy loss reduction in commercial and residential ductwork
Common industries: HVAC and mechanical insulation contracting, commercial and residential construction, building and facilities management.
AP/CoilFlex Duct Liner is a black, conformable, elastomeric thermal and acoustical duct liner supplied in roll form and based on synthetic rubber foam. It is designed to be installed inside fabricated HVAC ductwork, where its soft, conformable structure wraps duct corners without compression while providing combined thermal insulation and airborne noise attenuation — reducing energy loss and background HVAC noise in a single fiber-free layer.
The material is fiber-free and non-particulating, formaldehyde-free, and free of PBDE flame retardants, with a built-in EPA-registered MICROBAN antimicrobial additive that passes mold growth testing (ASTM G21, ASTM C1338) and produces no objectionable odors (ASTM C665). It resists erosion at high airflow velocities, showing no breakaway, flaking, or delamination at velocities up to 10,000 ft/min (ASTM C1071), and carries a 25/50 surface burning rating (ASTM E84). Installation requires a substrate that is dry and free of dust and grease, and the liner accepts both water-based (with pins) and solvent-based adhesives. Compliant with Armacell North America’s ISO 9001 quality management certification, California Title 24 Building Energy Efficiency Standards, GREENGUARD Gold Certification, International Mechanical Code (IMC), International Energy Conservation Code (IECC), International Residential Code (IRC), ASTM E84, UL 723, and NFPA 90A/90B.
What differentiates AP/CoilFlex Duct Liner from fiberglass or fiber-based duct liners?
AP/CoilFlex Duct Liner is a fiber-free, non-particulating elastomeric foam, so it does not shed fibers into the airstream the way fiberglass duct liners can. Its soft, conformable foam structure wraps fabricated duct corners without compression, and it combines thermal insulation with acoustical attenuation (NRC 0.60) in a single fiber-free, formaldehyde-free, low-VOC layer.
Why does thermal conductivity matter when selecting AP/CoilFlex Duct Liner?
Thermal conductivity directly determines how much insulating value a given thickness delivers, which governs condensation control and energy loss along ducted air paths. AP/CoilFlex Duct Liner is rated at a declared thermal conductivity of λd ≤ 0.036 W/(m·K) at 75°F for 1" thickness (R-value 4.2), rising to ≤ 0.040 W/(m·K) at 100°F for 1-1/2" thickness (R-value 6), allowing thickness to be selected to meet specific energy code and condensation-control requirements.
What is the service temperature range for AP/CoilFlex Duct Liner?
The rated service temperature range is -183°C (-297°F) minimum to 104°C (220°F) maximum. The material can withstand a surface temperature of 250°F (121°C) per ASTM C411 without flaming, glowing, smoldering, delamination, melting, or insulation collapse, though continuous use temperature is limited to 220°F (104°C).
Is AP/CoilFlex Duct Liner suitable for code-regulated HVAC and indoor air quality applications?
Yes. AP/CoilFlex Duct Liner is GREENGUARD Gold Certified, conforms to the International Mechanical Code (IMC), International Energy Conservation Code (IECC), and International Residential Code (IRC), carries a 25/50 surface burning rating per ASTM E84 and UL 723, meets NFPA 90A and 90B, and is manufactured without CFCs, HFCs, HCFCs, PBDEs, or formaldehyde.
How should AP/CoilFlex Duct Liner be specified?
Specify grade (AP/CoilFlex Duct Liner), thickness, roll width, compliance requirements, dimensional tolerances, and finished format.
