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Hot selling aluminum alloy series of hydrophilic lacquered aluminum foil

The production and structure of hydrophilic foil

Hydrophilic aluminum foil is a special type of aluminum foil that has been treated to have a hydrophilic (water-absorbing) surface. The production process of hydrophilic foil typically involves the following steps:

Raw foil → cleaning → coating (hydrophilic layer, corrosion-resistant layer) → drying and curing → cutting → final hydrophilic foil product.

The finished product encompasses the following structure:

• Substrate aluminum foil: the core material is standard aluminum foil, typically made from high-quality pure aluminum and rolled into thin sheets.
• Hydrophilic coating: hydrophilic properties are achieved by applying a specialized coating on one or both sides of the aluminum foil.
• Surface treatment: hydrophilic coatings are usually applied through chemical or electrochemical processes to make them more attractive to water molecules.
• Microstructure: hydrophilic treatment alters the surface of the aluminum foil, reducing its contact angle with water droplets. This means that water droplets will spread and form a thin film on the surface rather than forming droplets.

Hydrophilic Aluminum Foil Parameters

• Hydrophilic aluminum foil enhances air conditioning efficiency by promoting the spread of water droplets during condensation, reducing electricity consumption.
• After undergoing degreasing, washing, and drying processes, it exhibits excellent hydrophilicity and corrosion resistance, extending the lifespan of air conditioning units.
• Hydrophilic aluminum foil improves cooling efficiency by 5%, has anti-corrosion properties, is odorless, and prevents water droplet buildup, optimizing air conditioning performance.

Hydrophilic coating specifications of hydrophilic foil

Transparent (Silver) Hydrophilic Aluminum Foil

• Features: Maintains the original metallic luster of aluminum foil with a transparent coating, providing basic hydrophilic properties.
• Applications: Suitable for standard air conditioning systems where appearance is not a priority.
• Advantages: Cost-effective and ideal for mass production of standard products.

Blue Hydrophilic Aluminum Foil

• Features: Offers excellent hydrophilic properties, enabling rapid dispersion of condensation water and preventing water droplet accumulation, which can affect heat exchange efficiency.
• Applications: Widely used in air conditioning evaporators, suitable for household and commercial air conditioners.
• Advantages: Aesthetic blue coating provides additional corrosion resistance.

Gold Hydrophilic Aluminum Foil

• Features: Coating offers superior corrosion resistance, making it suitable for use in demanding environments such as high humidity and high salt spray conditions.
• Applications: Commonly used in condensers or heat exchangers of high-end air conditioning systems.
• Advantages: Premium gold appearance enhances the product’s high-end appeal and durability.

Hydrophilic foil purchasing guide

1. Cores and Roll Diameter of Chalco hydrophilic foil

2. Dimensions and Tolerances

• Thickness Tolerance: ±3%
• Width Tolerance: ±1.0mm
• Special tolerance requirements for thickness and width can be customized according to customer needs.

3. Surface Quality

• The surface color of the aluminum foil should be uniform and free from defects that affect usage, such as coating voids, wrinkles, stripes, color differences, scratches, inclusions, and corrosion.
• End Quality: The aluminum foil end face should be tightly and evenly rolled, with no cracks, burrs, or other defects, with overlapping layers ≤2mm and tower shape ≤5mm.
• Joints: Joint rate should not exceed 20%, and joints should be clearly marked.

4. Product Labeling

• Roll Label: Each roll should indicate product name, alloy temper, specifications, weight, roll number, number and position of joints, inspector’s stamp, and company name.
• Box Label: Each box should indicate order number, technical agreement, product name, alloy temper, specifications, box number, gross weight, net weight, production date, and joint count.

5. Coating Performance

• Adhesion Requirements: Cupping Test (pressing depth 5mm): No delamination; T-Bend Test (180° bend): No delamination or peeling.
• Corrosion Resistance: Common hydrophilic foil (blue, gold) 500 hours of continuous neutral salt spray test, R.N-O≥9.5; High-resistance hydrophilic foil (gold): 1500 hours of continuous neutral salt spray test, R.N-O≥9.8.
• Acid and Alkaline Resistance: Coating is free from whitening, blistering, swelling, and shedding.
• Heat Resistance: After being held at 200℃ for 10 minutes, the coating adhesion and color remain stable.
• Oil Resistance: After 48 hours of immersion, no blistering or peeling occurs, with initial hydrophilicity θ≤10°.
• Odor: No abnormal odor under room temperature testing or after baking at 140℃ for 10 minutes. No odor in immersion test.
• Harmful Substance Content: Complies with EU REACH and ROHS standards.

6. Packaging, Transport, and Storage

• Packaging: Cores and packaging boxes should be kept clean, and aluminum foil should be sealed in plastic bags to protect against moisture, with a shelf life of 12 months.
• Storage: In accordance with Chinese National Standard GB/T 3199, avoiding moisture and extreme temperatures.