Name: PIR Sheet Suppliers and Manufacturers - China Factory - UNT Duct
Brand: UNTDuct
SKU: 312989948

Thanks to its excellent products and quality services, UNT Duct is one of the leading pir 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.

PIR Sheet

PIR (Polyisocyanurate) Sheet is a rigid thermal insulation board featuring a closed-cell foam core with aluminum foil or composite facings. With thermal conductivity as low as 0.018-0.022 W/m·K and fire resistance up to Class B1, it delivers superior energy efficiency, fire safety, and durability for building, HVAC, and industrial applications.

Structure: Silver Aluminum/ PIR 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)

Core Performance Parameters of PIR Sheet

The most prominent advantage of PIR Sheet lies in its excellent insulation and heat preservation performance. According to data from multiple manufacturers and third-party tests, its core performance indicators are as follows:

Thermal conductivity: The thermal conductivity of PIR panels is usually 0.018-0.024 W/m·K (25°C). According to the new national standard GB/T21558, PIR materials have 8 insulation grades, with the thermal conductivity ranging from 0.018 W/(m·K) to 0.022 W/(m·K). This value is at the leading level among all common insulation materials, significantly superior to traditional rock wool (about 0.040 W/m·K) and EPS (about 0.032-0.040 W/m·K).

Density and strength: The core material density of PIR is usually 40±2 kg/m³ or 60±2 kg/m³. At a density of 40 kg/m³, the compressive strength is ≥250 KPa; at a density of 60 kg/m³, the compressive strength is ≥320 KPa.

Absorption rate: The ultra-low absorption rate (about 0.36%) ensures the long-term stability and airtightness of the material in a humid environment.

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Fire Safety Performance of PIR Sheet

Fire safety is the core competitiveness of PIR Sheet compared to ordinary polyurethane (PUR) boards.

The six-member ring in the PIR molecular structure will cause the material to burn and char when heated, forming a dense carbonized protective layer that effectively prevents the spread of flames and heat transfer. The decomposition temperature of PIR foam is approximately 260°C, significantly higher than that of ordinary polyurethane (220°C). The hard PIR foam made by using pentane foaming can be used to make composite boards, with a fire resistance time of up to 30 to 60 minutes.

In terms of fire resistance level, the core material of PIR Sheet can generally reach B1 level (non-flammable), with an oxygen index exceeding 35%. Some high-end products (such as Kingspan PIR-ALU 35) can reach Class 0 fire resistance level under specific standards. Compared to ordinary polyurethane (usually B2 or B3 level), PIR has significant advantages in fire safety.

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Environmental and Sustainability of PIR Sheet

PIR Sheet is lightweight and easy to cut and shape, allowing for cutting into various sizes and shapes as per design requirements.

Modern PIR Sheet products have made significant progress in environmental aspects. Currently, mainstream products adopt fluorine-free foaming technology, with a green and pollution-free production process, having a zero potential for ozone layer depletion (ODP = 0) and extremely low greenhouse effect impact (low GWP). Some products have also obtained green building product certifications.

In terms of sustainability, the excellent insulation performance of PIR sheets can significantly reduce building operating energy consumption and carbon emissions. Compared to rock wool with a thermal conductivity of 0.040 W/m·K, the PIR board with a thermal conductivity of 0.022 W/m·K requires only about 55% of the thickness to achieve the same insulation effect, resulting in less material usage, thinner walls, and higher floor area ratio.

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Why choose UNTDuct

UNT Pre-insulated Ductwork

Project Case of UNTDuct

Project Case

PRE-INSULATED DUCT vs G.I. DUCTWORK

Metric	20mm PIR Pre - Insulated Duct (with 0.08mm Alu. Foil, )	0.5mm G.I Duct + 30mm Rubber Plastic (40-90kg/m³)
Fire Safety	Compliant (Class 0/BS 476, AS 1530.3). Self-extinguishing PIR core, low toxic smoke, non-combustible alu foil.	G.I non-combustible; rubber plastic fire-retardant but requires coating to meet strict codes.G.I
Thermal Insulation	Excellent. λ=0.020 W/m·K, no thermal bridging. 20mm integrated structure ensures consistent insulation.	Fair. λ=0.035 W/m·K, thermal bridging at G.I joints. 30mm insulation offset by metal conductivity.
Hygiene & Air Quality	Superior. Non-porous alu foil, smooth inner surface, moisture-resistant PIR. Meets cleanroom/hospital standards.	Poor. Porous rubber plastic traps dust/mold; G.I-insulation gaps breed pathogens.
Lightweight	1.4-1.5 kg/m². Ultra-light, reduces structural load; ideal for retrofits/timber-framed buildings.	5.1–6.3 kg/m². Heavy G.I base + bulk insulation; requires reinforced supports.
Energy Efficiency	Excellent. 20–30% lower HVAC energy consumption. Minimizes heat gain/loss in conditioned air.	Low. 20–30% higher energy loss due to inferior insulation and thermal bridging.
Ease of Construction	Easy. Factory-prefabricated tongue-and-groove joints. No separate insulation step; 40–60% less labor time.	Complex. Two-step on-site process: G.I duct fabrication + rubber plastic wrapping. Labor-intensive, prone to gaps.
Quiet Operation	Good. PIR core absorbs 10–15 dB airflow noise; alu foil dampens vibration.	Fair. Rubber plastic provides basic sound reduction, but G.I vibration and insulation gaps reduce efficiency.
Space Savings	Excellent. 20mm total thickness (all-in-one). Fits tight ceilings/retrofit cavities.	Poor. 30.5mm total thickness (0.5mm G.I + 30mm insulation). Bulky, requires larger installation space.
Environmental Friendliness	Balanced. CFC/HCFC-free PIR, recyclable alu foil. 20–30-year lifespan; net carbon positive in 1–3 years.	Low. Rubber plastic non-recyclable; 10–15-year lifespan. Frequent replacement increases waste; higher energy emissions.
Air Leakage	Superior. ≤2% air leakage (EN 1507, AS/NZS 3660.1). Airtight factory joints + alu foil vapor barrier.	Poor. 5–10% air leakage. On-site sealing gaps; separate vapor barrier required.

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 PIR 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 PIR duct panels, fabrication tools, jointing accessories, reinforcement components and related materials for complete pre-insulated duct fabrication.

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