en 
Wechat QRcode
Hotline:0755-22277778
Tel：0755-22277778
Mobile：13826586185（Mr.Duan）
Fax：0755-22277776
E-mail：duanlian@xianjinyuan.cn
Selection of 25 μ m PET aluminum plated film and gold thickness
In the selection process of PET aluminum plated film, the first question faced by engineers is often not "what performance do you want", but "how thick film do you want".
The total thickness of PET aluminum plated film is determined by the thickness of the PET substrate and the thickness of the aluminum plated layer. The substrate thickness ranges from 4.5 μ m to 188 μ m, covering a complete spectrum from ultra-thin packaging to industrial grade thick films. In this span, 25 μ m occupies a special position: it is not the thinnest or thickest, but it is one of the most widely used and in high demand specifications.
Core Insights:The answer lies in "balance" -25 μ m PET aluminum coated film has reached the industry recognized optimal balance point between mechanical strength, barrier performance, flexibility, processing adaptability, and economy. This thickness is sufficient to provide reliable physical protection and barrier performance, while also being thin and lightweight enough to support high-speed winding processing and cost control. It is neither prone to wrinkling or stretching deformation in high-speed printing and lamination like 6 μ m or 12 μ m, nor does it increase material costs and roll weight like 50 μ m or thicker specifications. It is precisely this' just right 'that has made 25 μ m a universal thickness standard in multiple fields such as packaging, electronics, and construction.
The core manufacturing process of 25 μ m PET aluminum plated film is vacuum evaporation - heating and evaporating high-purity aluminum in a high vacuum environment, causing aluminum vapor to condense and deposit on the surface of the high-speed running PET film, forming a layer of metallic aluminum with a thickness usually between 20-60 nanometers. The thickness of the aluminum layer can also be represented by optical density (OD), with a higher OD value indicating a thicker aluminum layer and lower transmittance.
Vacuum aluminum plating is performed on a 25 μ m PET substrate, with a relatively wide process window. Compared with the 6 μ m ultra-thin substrate, the 25 μ m substrate has a larger thermal capacity and higher mechanical strength. It has a higher tolerance for temperature and tension fluctuations during the evaporation process, making it easier to ensure the uniformity and adhesion of the aluminum layer. This is also the process foundation for stable mass production and high quality consistency of the 25 μ m specification. Advanced Institute Technology adopts advanced vacuum aluminum plating technology. The thickness range of PET aluminum plating film is between 4.5-188 μ m, and the width can reach 250mm-1200mm, supporting customization according to demand.
The relationship between aluminum layer thickness and performance:The thicker the aluminum layer (higher OD value) - the stronger the barrier, the higher the reflectivity, and the better the conductivity, but the flexibility decreases and the cost increases. The thinner the aluminum layer (lower OD value) - better flexibility, higher transparency, and lower cost, but the barrier and shielding performance is relatively weakened. It is precisely this flexibility of "fixed substrate thickness and adjustable aluminum layer thickness" that allows the same 25 μ m PET substrate to derive product models with different performance focuses by adjusting the aluminum plating process.
Based on a 25 μ m PET substrate, aluminum plated film products with different aluminum layer thicknesses can be prepared by precisely controlling the aluminum plating process parameters. Different thicknesses of aluminum layers correspond to different performance priorities, and engineers can choose according to specific application requirements:
| Product Type | Optical density (OD) is approximately | Key Features | Typical Applications |
|---|---|---|---|
| 25 0.5PET aluminum plated film | ~0.5 OD | Medium barrier properties, good flexibility, high cost-effectiveness | Food packaging, printing composite, label materials |
| 25 1PET aluminum plated film | ~1.0 OD | Standard aluminum coating, balancing barrier and flexibility | High barrier packaging, candy and chocolate twisted film, pharmaceutical packaging |
| 25 1.2PET aluminum plated film | ~1.2 OD | Thick aluminum layer, high barrier and reflectivity | High end barrier packaging, electromagnetic shielding, heat-insulating reflective materials |
Note: Optical density (OD) is a commonly used indicator to measure the thickness of aluminum coated films. The higher the OD value, the thicker the aluminum layer, and the higher the barrier and reflectivity.
Selection suggestion:If the application has high requirements for barrier and shielding properties, you can choose25 1.2PETIf a balance needs to be struck between performance and economy,25 1PETIt is a universal choice in the industry; If more sensitive to flexibility and cost,25 0.5PETIt is a suitable option.
A classic application of 25 μ m aluminum plated film is the twisting packaging of candies and chocolates. In twisted packaging, a thickness of 25 μ m provides sufficient stiffness and twist retention, preventing the packaging from rebounding and loosening after twisting. At the same time, the aluminum coating provides excellent barrier performance and metallic luster, effectively extending the product shelf life and enhancing shelf appeal. The 25 μ m specification is also one of the most commonly used VMPET thicknesses in composite flexible packaging, widely used for packaging in industries such as food, medicine, and cosmetics.
The performance advantage of 25 μ m PET aluminum coated film comes from the synergistic effect of PET substrate and aluminum layer. The industry standard technical reference data is as follows:
The oxygen permeability is as low as 1.5-3.5 cc/㎡· 24h, and the moisture permeability is as low as 1.5-8 g/㎡· 24h. The aluminum layer effectively blocks oxygen, water vapor, and ultraviolet radiation, providing comprehensive protection for the contents.
Tensile strength ≥ 150-170MPa, elongation at break ≥ 80-110%. Stable size and good processing adaptability in high-speed printing, lamination, and cutting.
The reflectivity of aluminum surface can reach over 95%, with excellent metallic luster, and unique value in fields such as insulation, reflection, and decoration.
After aluminum plating, the surface resistivity is significantly reduced, effectively dissipating static electricity, and suitable for electronic component packaging and anti-static industrial scenarios.
The area with the highest usage. 23 μ m and 25 μ m are widely used in candy and chocolate twist packaging, flavor food vacuum packaging, and pharmaceutical and cosmetic packaging. The aluminum layer effectively blocks oxygen, water vapor, and light, extending the shelf life.
Used for eliminating static electricity, electromagnetic interference protection, manufacturing electronic component packaging, and electromagnetic shielding materials.
Efficient insulation and reflective materials enhance energy efficiency, while metallic texture adds aesthetic value.
The higher the OD value, the stronger the barrier and shielding properties, but the flexibility decreases and the cost increases. Determine the priority based on factors such as oxygen barrier, moisture barrier, light shielding, and conductivity.
25 μ m aluminum plated film has good adaptability to post-processing such as printing, lamination, and die-cutting, but attention should be paid to tension and temperature control to avoid cracking or peeling of the aluminum layer.
Advanced Institute Technology's PET aluminum plated film has a thickness range of 4.5-188 μ m and a width of 250-1200mm. 25 μ m products can be flexibly customized according to width, roll length, OD value, and other factors.
The reason why 25 μ m PET aluminum plated film has become the industry's "golden thickness" is not because it has achieved the ultimate in a certain performance dimension, but because it has achieved the optimal balance between mechanical strength, barrier performance, flexibility, processing adaptability, and economy. It is not as "thin to the limit" as 6 μ m, nor as "thick to redundancy" as 50 μ m - it is the "just right" choice in most application scenarios.
For engineers, understanding the engineering logic behind the thickness of 25 μ m - why it is 25 instead of 12 or 50- is more valuable than simply remembering a specification. On this thickness platform, customizing products with different properties by adjusting the aluminum layer thickness (OD value) is a key step in transforming the "golden thickness" into specific engineering solutions.
www.avanzado.cn
© 2026 Xianjin Yuan · 25 μ m PET Aluminum Coating Technology Reference
Advanced Institute (Shenzhen) Technology Co., Ltd， © two thousand and twenty-onewww.xianjinyuan.cn. All Rights Reserved.Guangdong ICP No. 2021051947 sitemap
Español
Français
Português