Thanks to its excellent products and quality services, UNT Duct is one of the leading pu insulation sheet manufacturers and suppliers in China. Welcome to buy the high quality and customized products from our factory. We will offer you the best service and fast delivery.
PU Insulation Sheet
PU Insulation Sheet is rigid closed‑cell polyurethane foam panel with low thermal conductivity. It features lightweight, moisture‑proof and high compressive strength, widely applied in HVAC duct, building envelope and cold storage for energy‑saving thermal insulation.
Structure: Silver Aluminum/ PU Foam/ Silver Aluminum
Size: 4000*1200*20mm
Foam Density: 50kg/m3
Aluminum Thickness: 0.06mm or 0.08mm
Aluminum Color: Silver
Packing: 10 sheets/ package
Loading Capacity: 710 sheets/ 40'HQ (packed with plastic bags)
660 sheets/ 40'HQ (packed with cardboard box)
Application Value in HVAC Field of PU Insulation Sheet
In the HVAC industry, the core application of PU insulation boards is in prefabricated insulation duct panels, integrating structural, insulation, and air-tight protection functions. It replaces the traditional construction method of wrapping insulation cotton around iron sheet ducts. The panels can be cut, grooved, and folded on-site without the need for a second layer of insulation, significantly reducing construction time. The duct system has good air-tightness, effectively suppressing cold bridge phenomena, reducing air conditioning cold and heat loss, and the overall system's comprehensive energy consumption can be reduced by 15-30%. Long-term operation shows obvious energy-saving benefits.
Additionally, the panels have certain sound insulation and noise reduction capabilities, which can weaken the transmission of air flow noise within the ducts, making them suitable for commercial buildings, office buildings, clean workshops, and hospital ventilation systems. The disadvantage is that the ordinary PU base material itself has limited flame retardancy, and public building projects must select modified grades with flame retardant formulas to meet fire acceptance standards.
Comparing the Advantages and Disadvantages of Similar Insulation Materials
Comparison with rock wool: PU has a lower thermal conductivity, is lighter in weight, and has stable water resistance; rock wool has a higher fire resistance rating, but has greater self-weight, is prone to water absorption and moisture absorption, and generates a lot of construction dust.
Comparison with XPS extruded board: PU has a higher insulation efficiency and superior dimensional stability at high temperatures compared to XPS; XPS has a price advantage, but is prone to shrinkage and aging at high temperatures.
Comparison with PIR board: Ordinary PU has a lower cost and better toughness; PIR is a modified product of PU, significantly improves fire resistance, but has a higher material unit price. The shortcomings of PU are also quite prominent; ordinary polyurethane has poor UV resistance and will age and powder off under direct exposure to the sun in the open air; a protective surface layer must be applied to prevent this.
Production Process and Quality Control Points of PU Insulation Sheet
The quality of PU board largely depends on the foaming process, raw material formula, and surface layer composite process. Continuous production line foaming products have uniform and stable cell structures and high performance consistency; intermittent molding boards are prone to local density variations.
In terms of raw materials, the foaming agent system determines the environmental protection indicators. Modern products have largely eliminated CFC and HCFC and adopted low ODP environmentally friendly formulas to meet the environmental protection regulations of many countries in Europe, Asia, and Southeast Asia. The adhesion strength between the aluminum foil / color steel surface layer and the foam core material is extremely crucial; failure of adhesion can lead to bulging and delamination, directly shortening the lifespan of the duct. In foreign trade business, density, closed cell ratio, thermal conductivity, and fire resistance grade are the four most frequently requested test reports by customers and are also important basis for product negotiation.
Why choose UNTDuct
Project Case of UNTDuct
PRE-INSULATED DUCT vs G.I. DUCTWORK
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| Performance comparison based on UNT Duct product data and standard system configurations. Actual performance may vary depending on system design, installation method and project conditions. |
How To Make PU Pre-insulated Straight Duct
Step 1 - Tracing: outline the duct shapes on the panel.
Step 2 - Cutting: Using manual cutting tools, cut along the panel edges and create 90 degree "V" grooves on the panel.
Step 3 - Gluing: Apply glue to the cutting surfaces of the panels.
Step 4 - Folding: After the glue is cured, fold the sides toward each other to form the straight duct.
Step 5 - Taping: The tape is applied only to the external seams of the duct where the sides of the panel were joined for air-tightness.
Step 6 - Flanging: After applying glue and positioning the steel angle bracket, process to fit the PVC or aluminum invisible flanges.
Step 7 - Reinforcement: reinforce the duct with an aluminum reinforcement bar and G.I. Shaped disks, if necessary.
Step 8 - Sealing: After the duct is assembled, seal all internal joints hermetically with silicone.
Need the complete fabrication solution?
UNT Duct supplies PU duct panels, fabrication tools, jointing accessories, reinforcement components and related materials for complete pre-insulated duct fabrication.
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