Aluminum Foil Laminate for PU Foam

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Aluminum Foil Laminate for PU Foam

Aluminum foil for PU foam is a specialized packaging/laminating material designed to bond with Polyurethane (PU) foam, serving as a protective, insulating, and structural enhancement layer. Made from high-purity aluminum (99.4%+ purity) via precision rolling, it features thin gauge, high flexibility, and excellent adhesion to PU foam matrices. The foil acts as a barrier against moisture, air, and contaminants while boosting the foam’s thermal insulation, mechanical stability, and durability. It is widely used in construction, refrigeration, transportation, and industrial applications where PU foam’s insulation and cushioning properties are paired with aluminum foil’s barrier functions.

Model:
Aluminum Foil for PU Foam
Brand:
Dignang Metal

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Product Description

Aluminum Foil for PU Foam (PU Foam Laminated Aluminum Foil)

1. Product Overview

Aluminum foil tailored specifically for PU foam represents a highly specialized form of packaging and laminating material. Its primary purpose is to form a strong bond with Polyurethane (PU) foam, thereby fulfilling multiple crucial roles as a protective, insulating, and structural enhancement layer.

This aluminum foil is crafted from high - purity aluminum, with a minimum purity level of 99.4%. The manufacturing process involves precision rolling, which endows it with several distinctive characteristics. Firstly, it has a thin gauge, allowing for easy handling and integration within various applications. Secondly, it exhibits high flexibility, enabling it to conform to different shapes and contours. Thirdly, it demonstrates excellent adhesion to PU foam matrices, ensuring a secure and long - lasting bond.

Functionally, the foil serves as an effective barrier. It shields the PU foam from moisture, preventing water absorption that could potentially degrade the foam's performance. It also blocks air, which is important for maintaining the foam's insulating properties. Additionally, it keeps out contaminants, safeguarding the integrity of the foam. At the same time, when combined with the PU foam, it significantly enhances the foam's thermal insulation capabilities, making it more efficient in retaining heat or cold. It also improves the mechanical stability of the foam, reducing the risk of deformation under stress, and increases its overall durability, extending its lifespan.

This specialized aluminum foil for PU foam finds extensive use across a wide range of industries. In construction, it is utilized in insulating walls, roofs, and floors, where the combination of PU foam's insulation and the foil's barrier functions provides enhanced energy efficiency. In refrigeration, it helps maintain low temperatures by preventing heat transfer and protecting the foam from moisture. In the transportation sector, it can be found in vehicle insulation and cushioning applications, ensuring passenger comfort and protecting sensitive components. Industrial applications also benefit from this material, leveraging the combined properties of PU foam and aluminum foil for processes that require insulation and protection.

2. Technical Specifications Table

Parameter	Specification	Typical Range	Application Notes
Thickness	0.012mm, 0.015mm, 0.020mm, 0.030mm	0.008mm - 0.050mm	Thinner foils (0.008-0.015mm) for flexible PU foam; thicker (0.020-0.050mm) for rigid PU foam
Aluminum Purity	≥99.4%	99.4% - 99.8%	High purity ensures flexibility and corrosion resistance
Alloy Grade	1235, 1145	1060, 1100	1235 grade preferred for lamination due to optimal ductility
Temper	O (Soft)	O, H14	O temper for maximum flexibility; H14 for rigid PU foam applications
Surface Treatment	Chromate-free passivation, PE coating, acrylic primer	Passivation, hot-melt adhesive coating	Coated foils enhance adhesion to PU foam (peel strength ≥1.5 N/25mm)
Tensile Strength	70 - 120 MPa	60 - 150 MPa	Higher strength for structural PU foam laminates
Elongation at Break	≥15%	12% - 25%	Ensures flexibility during foam molding/installation
Moisture Vapor Transmission Rate (MVTR)	≤0.5 g/(m²·24h)	0.1 - 1.0 g/(m²·24h)	Critical for moisture barrier in insulation applications
Thermal Conductivity	237 W/(m·K)	230 - 240 W/(m·K)	Enhances PU foam’s thermal insulation efficiency by 10-15%
Width	500mm, 1000mm, 1250mm	300mm - 2000mm	Custom widths available for continuous lamination lines
Weight	33.6 g/m² (0.012mm), 42 g/m² (0.015mm)	22.4 - 140 g/m²	Lightweight to avoid compromising PU foam’s weight advantage
Adhesion to PU Foam	≥1.5 N/25mm	1.5 - 3.0 N/25mm	Tested via 180° peel test at 23°C
Corrosion Resistance	Passes 48-hour salt spray test	48 - 96 hours	Suitable for indoor/outdoor applications

3. Product Advantages

3.1 Barrier Performance

Superior Moisture Resistance: Blocks water vapor ingress, preventing PU foam degradation (mold growth, structural weakening) and extending service life by 30-50%

Air & Gas Barrier: Reduces oxygen penetration, slowing PU foam oxidation and preserving insulation properties over time

Contaminant Shield: Protects foam from dust, chemicals, and environmental pollutants in industrial or construction settings

3.2 Functional Enhancement

Thermal Insulation Boost: Reflects radiant heat, complementing PU foam’s low thermal conductivity to improve overall insulation efficiency by 10-15%

Mechanical Reinforcement: Adds tensile strength and tear resistance to PU foam, preventing damage during transportation and installation

Dimensional Stability: Minimizes PU foam’s shrinkage/expansion under temperature variations (-40°C to +80°C), maintaining structural integrity

3.3 Processing & Application Benefits

Excellent Adhesion: Surface treatments (passivation, coating) ensure strong bonding with PU foam via lamination, molding, or adhesive bonding

High Flexibility: Thin gauge and soft temper allow conforming to curved or irregular PU foam surfaces without cracking

Easy Fabrication: Can be cut, folded, and laminated with PU foam using standard equipment, reducing production time by 20-30%

Lightweight: Negligible weight addition (≤5% of total foam-foil composite weight), preserving PU foam’s lightweight advantage

Cost-Effective: Low material cost combined with long service life offers high performance-to-cost ratio

3.4 Environmental & Safety

Chromate-Free Passivation: Complies with RoHS and REACH standards, ensuring environmental safety

Non-Toxic: Inert aluminum material does not react with PU foam or release harmful substances, suitable for food contact (e.g., cold storage)

4. Downstream Applications

4.1 Construction & Building Insulation

Rigid PU Foam Panels: Laminated to exterior wall insulation panels, roof insulation boards, and partition walls for residential and commercial buildings

Pipe Insulation: Wrapped around HVAC ducts, water pipes, and industrial pipelines to enhance thermal insulation and moisture protection

Spray Foam Insulation: Used as a facing material for spray-applied PU foam in attics, basements, and wall cavities

4.2 Refrigeration & Cold Chain

Refrigerators/Freezers: Laminated to PU foam liners and door insulation to improve cooling efficiency and moisture resistance

Cold Storage Warehouses: Bonded to PU foam panels for walls, ceilings, and floors, maintaining stable low temperatures

Refrigerated Transportation: Used in truck trailers, shipping containers, and railcars to insulate PU foam cores, preserving perishable goods

4.3 Furniture & Bedding

Mattresses & Sofa Cushions: Laminated to flexible PU foam for moisture barrier and structural support, extending product lifespan

Furniture Upholstery: Used as a backing layer for PU foam padding in chairs, sofas, and office furniture to prevent foam degradation

4.4 Industrial & Special Applications

Automotive Insulation: Bonded to PU foam for car interior insulation (dashboard, door panels, roof liners) to reduce noise and improve thermal comfort

Packaging Materials: Laminated to PU foam for protective packaging of fragile items (electronics, glassware) – combines cushioning and moisture barrier

Marine Insulation: Used in boat hulls and interiors to insulate PU foam, resisting saltwater corrosion and moisture

5. Production Process

5.1 Raw Material Preparation

Aluminum Ingot Selection: High-purity aluminum ingots (99.4%+ purity) are melted and cast into aluminum coils (thickness: 6-8mm)

Foil Blank Preparation: Coils are inspected for surface defects, chemical composition, and dimensional accuracy

5.2 Rolling Process

Hot Rolling: Aluminum coils are hot-rolled to reduce thickness to 2-3mm (intermediate gauge)

Cold Rolling: Multiple passes of cold rolling (room temperature) reduce thickness to the target gauge (0.008-0.050mm), ensuring uniform thickness and smooth surface

Annealing: Cold-rolled foil is annealed in a continuous furnace (300-400°C) to achieve O (soft) temper, enhancing flexibility and ductility

5.3 Surface Treatment

Cleaning & Degreasing: Foil is cleaned with alkaline solutions to remove oils and contaminants, then rinsed with deionized water

Passivation: Chromate-free passivation treatment forms a thin protective layer, improving corrosion resistance and adhesion

Coating (Optional): PE, acrylic, or hot-melt adhesive coating is applied via roller coating for enhanced bonding with PU foam (coating thickness: 3-5μm)

Drying: Coated foil is dried in an oven (80-100°C) to remove moisture and cure the coating

5.4 Slitting & Cutting

Slitting: Continuous foil rolls are slit into specified widths (300-2000mm) using precision slitting machines

Trimming: Edge trimming ensures uniform width and eliminates burrs

5.5 Quality Control & Packaging

Thickness Inspection: Automated gauges check thickness uniformity (tolerance: ±0.001mm)

Adhesion Test: 180° peel test verifies bonding strength with PU foam

Barrier Test: MVTR and gas transmission rate tests ensure barrier performance

Surface Inspection: Visual and automated checks for scratches, pinholes, or coating defects

Packaging: Foil rolls are wrapped in moisture-proof PE film, placed on wooden pallets, and labeled with product specifications; stored in dry warehouses (temperature: 15-30°C, humidity: ≤60%)