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PI Foam ducting

PI Foam ducting is a lightweight, flexible thermal-insulation solution made from polyimide foam, engineered for aerospace and high-performance industrial systems. It excels in extreme temperatures (–260°C to +300°C), offers excellent noise attenuation, flame resistance, and low outgassing, ensuring reliable airflow delivery in confined, safety-critical environments.

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)

Why Can PI Foam Be Used as Air Ducts?

Leaving aside the conventional label of "flexible air ducts", the core competitiveness of PI Foam ducting primarily stems from the molecular structure of polyimide (PI) foam.
The closed-cell ratio of over 90% gives the foam form the ability to turn the duct itself into a "static air layer sandwich structure" - the thermal conductivity can be as low as 0.035 W/(m·K), which means that the duct wall itself serves as the insulation layer, eliminating the need for additional wrapping with glass wool or aerogel.
Unlike solid PI films, the foaming process significantly reduces the bending stiffness and surface density (typically < 80 kg/m³), enabling large-diameter pipes to be manually bent without the need for special elbows or metal spring frameworks.

Key inference: This is not "foam-made ductwork", but rather "integrating structural insulation into a flexible tubular form". Its essence lies in the application of functionally graded materials along the ventilation path, rather than a replacement of the traditional ductwork material.

Value from the "Installation Scenario"

Cold Bridge Eliminator: Since the pipe wall itself is a poor heat conductor, no rubber gaskets need to be installed at the flange connection to block the heat flow. When the air supply from the avionics equipment compartment (at a cold end temperature of -15°C) passes through the engine compartment (with an ambient temperature of +80°C), almost no condensation occurs on the outer wall of the pipe, eliminating the risk of water droplets causing a short circuit.
Vibration decoupler: The elastic modulus of the foam decreases nonlinearly with increasing frequency (the damping factor is greater than 0.1). It can actively absorb the blade vibrations caused by compressors or fans at frequencies ranging from 500 to 2000 Hz, thereby reducing fatigue fractures resulting from hard connections.
Tool-free forming: On-site, based on the direction of the obstacles, permanent bending and shaping can be achieved using manual methods or a hot air gun (with 120℃ assistance). The curvature retention rate exceeds 90%, eliminating the lengthy process of 3D scanning and prefabricated pipe bending - for aircraft overhauls or mid-life modifications of ships, this can save up to 40% of time.

PI Foam Ducting vs. Alternative Solutions

Solution	Temperature Resistance	Flexibility	Thermal Insulation	Flame Retardancy	Typical Application Scenarios
Galvanized steel + fiberglass wool	High	None	Excellent	Good	Ground-based buildings / HVAC
Silicone-coated fiberglass fabric	Medium	Excellent	Poor	Excellent	Automotive engine compartments
PTFE membrane composite tube	Ultra-high	Poor	Poor	Excellent	Chemical corrosive exhaust
PI Foam Ducting	High	Excellent	Excellent	Excellent (UL94 V-0)	Aviation / Naval vessels / High-end industrial equipment