Phenolic WTI UL 181 Pre-Insulated Duct
The ductwork is constructed from phenolic sandwich panels, consisting of a rigid phenolic foam core faced on both sides with reinforced aluminum foil.
These panels are designed to deliver excellent thermal performance, fire resistance, and long-term durability for HVAC duct systems.
- Rigid closed-cell phenolic foam
- CFC-free and HCFC-free
- Density: 55–60 Kg/m³
- High fire resistance, Class 1 as per UL-181
- Low smoke and flame spread indices
- Excellent thermal conductivity (0.021–0.036 W/m·K)
- Moisture-resistant with zero water vapor transmission
- Environmentally friendly (ODP = 0, GWP < 5)
- Aluminum facer thickness: ≥ 250 microns reinforced foil
- Panel Thickness:
- Air-conditioned areas: 20 mm
- Plant rooms: 30 mm
- Outdoor/exposed areas: 30 mm
- Specifications
- Technical Datasheet
- Catalogue
Overview
World Thermal Phenolic Panels are a high-performance insulation solution engineered for reliability and efficiency. Designed with a fiber-free rigid thermoset phenolic core, these panels deliver exceptional thermal performance and fire resistance. Both sides are finished with a durable composite foil facing that enhances strength, durability, and moisture protection.
Key Benefits
2. Fiber-Free Core
The rigid thermoset phenolic core is completely fiber-free, offering a clean and dust-free solution ideal for hygienic applications.
1. High Thermal Efficiency
Phenolic insulation provides one of the lowest thermal conductivity levels among insulation materials, ensuring superior energy savings and long-term performance.
3. Fire Resistance
These panels are engineered to meet stringent fire safety standards, providing enhanced protection in high-risk environments.
4. Durable Composite Facing
Each panel is coated with a reinforced composite foil facing on both sides, ensuring mechanical strength, surface protection, and resistance to moisture and vapor transmission.
Features
- Standard Thicknesses: 20mm and 30mm
Flexible options suitable for various insulation applications. - Excellent Thermal Performance: Reduces heat transfer and enhances energy efficiency.
- Long-Term Stability: Maintains performance over time without shrinkage or degradation.
- Lightweight & Easy to Install: Simplifies handling and reduces installation time.
Applications
- HVAC Duct Insulation
- Wall and Ceiling Panels
- Roof and Floor Insulation
- Cleanrooms and Controlled Environments
WTI Phenolic (UL-181) Pre-Insulated Duct System
Product Overview
WTI Phenolic (UL-181) Pre-Insulated Duct System is designed for superior air distribution performance and energy efficiency.
Manufactured using high-density rigid phenolic foam with reinforced aluminum facers, it ensures excellent thermal insulation, low air leakage, and outstanding fire resistance.
This system fully complies with UL-181 and SMACNA Phenolic Duct Construction Standards, ensuring reliability, durability, and safety in HVAC applications.
Technical Specifications
| Description | Value | Standard / Test Method |
| Density | 65±5 kg/m³ | ASTM D1622 / D1622M-14 |
| Thermal Conductivity | 0.021–0.036 W/m·K | ASTM C518:2007 |
| Water Vapor Transmission | 0.00 g/h·m² | ASTM E96 |
| Toxic Chemical Analysis (Formaldehyde) | < 0.01 mg/m³ | ASTM D5582 / IHP |
| Closed Cell Content | > 90% | ASTM D6226 |
| Compressive Strength | > 200 kPa | ASTM D1621-16 |
| Flame Spread Index | < 25 | ASTM E84 / UL723 |
| Smoke Developed Index | < 50 | ASTM E84 / UL723 |
| Phenolic “Air Ducts” Classification | Class 1 | UL181 |
| Phenolic Foam Chemical Property | CFC Free / HCFC Free | — |
| Environmental Impact | ODP = 0 (GWP < 5) | — |
| Facing Material | ≥ 250 microns reinforced aluminum facer | — |
| Recommended Operating Temperature | −26°C to +85°C | UL181 |
| Temperature Range | −17.8°C to +129.4°C | UL181 |
| Design Pressure | Positive = 1000 Pa Negative = 750 Pa | UL181 |
| Duct Construction Standard | SMACNA Phenolic Duct Construction Standard | — |
WTI-Phenolic
Technical Datasheet
WTI-Phenolic
Product Catalogue
