Requirements of the Duct Industry for Aluminum Film（I）
2025-03-21
I. Physical Property Requirements
(I) Thickness Uniformity
The thickness of the aluminum film needs to be highly uniform. Areas that are too thin may lead to insufficient strength, making the aluminum film prone to damage during the installation and use of air ducts. On the contrary, if it is too thick, it will increase the material cost and the weight of the air ducts, affecting the installation convenience and the energy consumption of the system. Generally, the thickness of the aluminum film used in ventilation and air - conditioning ducts is between 0.05 - 0.2mm. Different application scenarios require the thickness tolerance to be strictly controlled within ±0.005mm. For example, in places with extremely high requirements for air quality such as clean rooms and hospital operating rooms, thinner aluminum films with better thickness uniformity (such as 0.08±0.003mm) are widely used to ensure that the inner surface of the air ducts is smooth and flat, reducing air flow resistance and dust accumulation.
(II) Flexibility and Strength
The aluminum film should have good flexibility and should not crack or wrinkle during air duct processing operations such as bending, folding, and coiling. Meanwhile, it needs to have sufficient strength to withstand the internal air pressure, external mechanical impacts, and certain temperature change stresses. Commonly, the tensile strength of the aluminum film should be no less than 100MPa, and the elongation at break is between 10% - 30%. In industrial plants and other complex environments where there may be a slight risk of mechanical impact, choosing an aluminum film with higher strength (tensile strength ≥ 150MPa) can effectively extend the service life of the air ducts.
II. Chemical Property Requirements
(I) Corrosion Resistance
The air inside the ducts may contain water vapor, acids, alkalis, and other corrosive substances. Therefore, the aluminum film is required to have excellent corrosion resistance. On one hand, the surface of the aluminum film should be specially treated, such as through anodization or coating with an anti - corrosion coating, to form a dense protective film that prevents aluminum from coming into contact with corrosive media. On the other hand, for ducts in industrial environments with high humidity and chemical gas emissions or in coastal areas, the corrosion resistance of the aluminum film needs to be more remarkable. For instance, in chemical workshops, aluminum films treated with fluorocarbon coatings have significantly enhanced acid and alkali resistance. They can effectively resist the erosion of common corrosive gases like hydrochloric acid and sulfuric acid, ensuring a service life of more than 20 years for the ducts.
(II) Antibacterial Performance
In places with strict requirements for air quality, such as hospitals, schools, and food processing plants, the aluminum film needs to have antibacterial functions. By adding antibacterial agents such as silver ions and nano - titanium dioxide to the surface of the aluminum film, the growth of bacteria and molds can be inhibited. Relevant antibacterial performance tests stipulate that the antibacterial rate of the aluminum film against common bacteria such as Escherichia coli and Staphylococcus aureus should reach over 99%, and the mildew - proof grade against Aspergillus niger and other molds should reach grade 0 (no mildew growth). This ensures the cleanliness and hygiene of the air transported by the ducts and prevents a decline in air quality and the generation of odors due to the growth of microorganisms.
Requirements of the Duct Industry for Aluminum Film(II)
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