Phenolic Pre-insulated Duct Board

Phenolic Pre-insulated Duct Board

 

Phenolic Pre-insulated Duct Board

It is a high-performance ventilation duct product, which is widely used in HVAC systems. The following is a detailed introduction:

 

Basic Structure: It is a sandwich structured panel. The core is polyisocyanurate (PIR) foam, which is a closed-cell insulating material. The two outer layers are aluminum sheets or aluminum foils.

 

Panel Structure: Silver Alu. Foil/ Phenolic Foam/ Silver Alu. Foil
Foam Density: 50-55kg/CBM
Panel Dimension: 3950mm*1200mm*20mm or 2900*1200*20mm
Alu. Foil: 60 or 80 Micron (Embossed)
Fire Rating: Class 0 (BS476Part 6&7) or Class A (ASTM E84)

Core Functional Layer (Phenolic Foam Core)​

Main raw materials: Phenolic resin (phenol-formaldehyde copolymer), low-ODS foaming agent (e.g., cyclopentane), curing agent (e.g., organic acid), and flame-retardant additive.​

Characteristic: Closed-cell structure formed by foaming and curing; serves as the core insulation and fire-resistant layer.​

Pre-insulation Enhancement Layer​

Common components: Glass wool mat or rigid polyurethane foam (thin layer).​

Function: Assists the phenolic foam core in improving thermal insulation continuity, reducing cold/heat bridge effects.​

Inner Protective Layer (Airflow Contact Side)​

Typical materials: Aluminum foil (food-grade, corrosion-resistant), galvanized steel sheet (thin-gauge, ≥0.3mm), or modified PVC film.​

Role: Ensures smooth airflow (low friction), prevents core material erosion by moisture/air impurities, and enhances corrosion resistance.​

Outer Protective Layer (Environmental Contact Side)​

Common options: Color-coated steel plate (polyester/fluorocarbon coating), FRP (fiber-reinforced plastic), or aluminum composite panel.​

Function: Resists outdoor/indoor mechanical impact, UV aging, and moisture penetration; protects the inner insulation structure.​

Adhesive Layer (Between Layers)​

Material: High-temperature resistant polyurethane adhesive or epoxy resin adhesive.​

Requirement: Non-toxic, low VOC; ensures strong bonding between core, inner, and outer layers (peel strength ≥0.15 MPa).

Project Case of Phenolic Pre-insulated Duct Board

 

Pre-insulated duct Project in Panama

Pre-insulated duct Project in China

Pre-insulated duct Project in Australia

Pre-insulated duct Project in Thailand

 

Although galvanized steel plate air ducts are widely used, their service life is relatively short in high-humidity environments. The use of FRP air ducts in places with dust-proof requirements and high humidity, such as hospitals, food processing plants, and basements, is restricted.

 

Phenolic aluminum foil composite air ducts, with their excellent performance, can be widely applied in industrial and civil buildings, hotels, hospitals, office buildings and other places with special requirements for fire prevention, moisture resistance, sound insulation and heat preservation, and can meet the ventilation needs in different scenarios.