Poly-Seal AF
Poly-Seal AF is a single-sided modified butyl duct joint and general-purpose mastic sealant constructed with 15–16 mils of butyl adhesive on a 2 mil aluminum foil backing, for a total thickness of 17–18 mils ±0.5. Engineered for HVAC duct sealing on a 40-year service cycle, it carries an extensive set of compliance credentials: UL 723 Pass, NFPA Class 1 (90A and 90B), SCAQMD Rule 1168 VOC pass, ASTM E84 flame 20 / smoke 40, and 0 g/L VOC per EPA Method #2. Performance-tested at 20″ w.c. pressure with peel adhesion >10 pli, tensile strength 955 psi minimum, and full bond within 15 minutes.
Key Properties
- Peel Adhesion: >10 pli (ASTM D3330-83)
- Tensile Strength: 955 psi minimum (ASTM D412)
- Service Temperature: −20°F to 200°F (ASTM D2243, ASTM D2485)
- Bonding Time: Immediate / full bond within 15 minutes
- VOC: 0 g/L (EPA Method #2)
- Total Thickness: 17–18 mils ±0.5 (15–16 mils butyl / 2 mils aluminum foil)
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- Specifications
- Applications
- General Info
- FAQs
Physical Properties
| Property | Value | Test Method |
| Total Thickness | 17–18 mils ±0.5 | — |
| Adhesive Thickness | 15–16 mils | — |
| Backing / Carrier Thickness | 2 mils | — |
| Color | Gray Aluminum Foil | — |
| Material / Substrate | Butyl / Aluminum | — |
| Backing / Carrier | Aluminum | — |
| Finish | Mill Finish | — |
| Adhesive Type | Modified Butyl | — |
| Adhesive System | Permanent Adhesive | — |
| Adhesive Side | Single Side Adhesive | — |
Mechanical Properties
| Property | Value | Test Method |
| Tensile Strength | 955 psi minimum | ASTM D412 |
| Ultimate Elongation | 500% | ASTM D412 |
| Flexibility | Excellent, no cracking | ASTM C765 |
Adhesion Properties
| Property | Value | Test Method |
| Peel Adhesion | >10 pli | ASTM D3330-83 |
| Bonding Time | Immediate / full bond: 15 minutes | — |
Thermal & Environmental Properties
| Property | Value | Test Method |
| Service Temperature | −20°F to 200°F | ASTM D2243, ASTM D2485 |
| Recommended Application Temperature | 35°F to 110°F | — |
| Water Resistance | Pass | CSTM.RA 8.0 |
| QUV, 2,000 Hours | Pass | ASTM G53 |
Flame & Fire Performance
| Property | Value | Test Method |
| Flame | 20 | ASTM E84, UL 723 |
| Smoke | 40 | ASTM E84, UL 723 |
| UL 723 | Pass | — |
| NFPA | Class 1 (90A) | — |
| NFPA | Class 1 (90B) | — |
VOC & Pressure Performance
| Property | Value | Test Method |
| VOC Limitation | Pass | SCAQMD Rule 1168 |
| VOC | 0 g/L | EPA Method #2 |
| Pressure Test | 20″ w.c. | Independent 24 hr. test up to 5/8″ diameter |
Recycled Content
| Property | Value | Test Method |
| Post-Industrial Recycled Content | 0% | — |
| Pre-Consumer Recycled Content | 0% | — |
Shelf Life / Storage
| Property | Value | Test Method |
| Shelf Life | 24 months | — |
| Recommended Storage Conditions | 35°F to 110°F. Do not freeze. | — |
Compliance
- UL 723 — Pass
- ASTM E84 — Flame 20 / Smoke 40
- NFPA Class 1 (90A) — Compliant
- NFPA Class 1 (90B) — Compliant
- SCAQMD Rule 1168 (VOC Limitation) — Pass
- ASTM G53 (QUV 2,000 hours) — Pass
- EPA Method #2 — 0 g/L VOC (True Zero VOC)
- HVAC duct and pipe joint sealing on sheet metal, duct board, flex duct, and PVC-coated duct systems
- 40-year service cycle duct joint mastic sealing in commercial and industrial HVAC installations
- Subgrade application on PVC-coated ducts for replacement and renovation projects
- UL 723 / NFPA Class 1 flame-rated sealing for code-required HVAC and building applications
- Zero-VOC sealing applications where SCAQMD Rule 1168 compliance is required
Common industries: Commercial HVAC, industrial HVAC, code-compliant duct sealing, building services, mechanical contracting.
Poly-Seal AF is a heavily compliance-credentialed modified butyl duct joint sealant designed for a 40-year service life on HVAC ducts and pipe joints. The construction pairs 15–16 mils of butyl adhesive with a 2 mil aluminum foil backing in a mill finish, producing a 17–18 mil total stack appropriate for sheet metal, duct board, flex duct, and PVC-coated duct applications. The aluminum foil backing provides instant water-resistant performance, dimensional stability, and a metallic appearance compatible with HVAC equipment.
The product is also suitable for subgrade application on PVC-coated ducts and is positioned as ideal for replacement applications.
The compliance credential set is the most comprehensive in the Poly-Seal family. The tape passes UL 723 and ASTM E84 with Flame 20 and Smoke 40 ratings, qualifies as NFPA Class 1 for both 90A and 90B classifications, passes SCAQMD Rule 1168 VOC limitation, passes QUV 2,000-hour weathering per ASTM G53, and registers 0 g/L VOC per EPA Method #2.
The tape was independently pressure-tested at 20″ water column over a 24-hour period for openings up to 5/8″ diameter, and is rated for all pressure classes up to 20″ W.C. — supporting both supply and return duct applications across commercial and industrial HVAC systems.
Performance: peel adhesion >10 pli per ASTM D3330-83, tensile strength 955 psi minimum and ultimate elongation 500% per ASTM D412, and full bond achieved within 15 minutes — substantially faster than the 24-hour cure typical of other Poly-Seal variants. Service temperature is −20°F to 200°F per ASTM D2243 and ASTM D2485. Recycled content is 0% (both post-industrial and pre-consumer). Shelf life is 24 months at 35°F to 110°F; do not freeze.
Compliant with UL 723, ASTM E84 (Flame 20 / Smoke 40), NFPA Class 1 (90A and 90B), SCAQMD Rule 1168 VOC limitation, ASTM G53 (QUV 2,000-hour weathering), and EPA Method #2 (0 g/L VOC).
What differentiates Poly-Seal AF from other Poly-Seal variants?
AF carries the most extensive compliance credential set in the family — UL 723, NFPA Class 1 (both 90A and 90B), SCAQMD Rule 1168 VOC, ASTM E84 (Flame 20 / Smoke 40), QUV 2,000-hour weathering, and 0 g/L VOC. Combined with the aluminum foil backing, 40-year service-cycle positioning, 15-minute full bond time, and 20" w.c. pressure rating, it is the right selection for code-compliant commercial and industrial HVAC duct sealing where flame, smoke, and VOC requirements drive the specification.
Why is peel adhesion important when selecting this tape?
For HVAC duct sealing, peel adhesion combined with pressure rating (20" w.c.) determines whether the tape can hold seal integrity under operational duct pressures. The >10 pli peel value confirms strong substrate bonding, while the 955 psi tensile strength and 500% ultimate elongation handle the dimensional movement induced by HVAC thermal cycling.
What is the service temperature range for Poly-Seal AF?
Poly-Seal AF has a service temperature range of −20°F to 200°F per ASTM D2243 and ASTM D2485, with a recommended application temperature of 35°F to 110°F.
Is Poly-Seal AF suitable for code-compliant or VOC-regulated HVAC applications?
Yes. The TDS confirms compliance with UL 723, NFPA Class 1 (90A and 90B for HVAC duct construction code), SCAQMD Rule 1168 (Southern California VOC limitation), and reports 0 g/L VOC per EPA Method #2. ASTM E84 flame and smoke ratings of 20 and 40 respectively support Class A code requirements for plenum and other regulated installation environments.
How should Poly-Seal AF be specified?
Specify product (Poly-Seal AF), thickness (17–18 mils ±0.5), backing (aluminum foil), color (gray aluminum foil), compliance requirements (UL 723 / NFPA / SCAQMD as applicable), pressure class (up to 20" w.c.), dimensional tolerances, and finished format.
