一、 Normal service life conditions 

The service life of the sealing liner (aluminum foil sealing film) is determined by the following objective conditions: 

1. Unpackaged state (storage period) 

In the original packaging with temperature ≤ 25 ℃ and relative humidity ≤ 65% 

Store away from light and chemical solvents 

The standard product shelf life is 24-36 months 

2. Encapsulated state (service life) 

3. Basic lifespan determined by material 

Ordinary PE heat sealing layer: basic protection, suitable for products with pH 5-9 

Surlyn coating: resistant to chemical corrosion, with a lifespan 40-60% longer than PE layer 

Aluminum foil thickness: 40 μ m improves oxygen barrier properties by about 15-20% compared to 30 μ m 

Composite layer number: The water vapor barrier performance of the 4-layer structure is improved by about 30% compared to the 3-layer structure 

二、 Specific factors affecting lifespan 

1. Temperature impact 

For every 10 ℃ increase in storage temperature, the material aging rate increases by approximately 1.5-2 times 

Continuous exposure to temperatures above 40 ℃ may lead to adhesion or embrittlement of the heat seal layer 

2. Mechanical stress 

Frequent squeezing and deformation can cause microcracks in aluminum foil 

Cracks can increase oxygen permeability by tens of times 

3. Content compatibility 

PH<4 or>9 will accelerate the corrosion of aluminum layer 

Ester and ketone solvents may dissolve the heat sealing layer 

三、 Clear indication of end of life 

Any of the following situations indicates that the sealing liner has failed: 

Physical damage: visible cracks, perforations, or delamination 

Sealing failure: leakage at the bottle mouth or easy detachment 

Chemical corrosion: aluminum layer shows spots, blackening, or large-scale peeling off 

Content contamination: sealing liner material falls off into the product 

4、 Usage suggestions 

Matching selection: Select the corresponding material sealing liner based on the chemical properties of the content 

Batch management: follow the principle of "first in, first out" to avoid overdue inventory 

Environmental control: Maintain stable temperature and humidity in the storage environment 

Process validation: Ensure that the temperature, pressure, and time parameters of the sealing equipment are correct 

Regular inspection: Check the appearance changes of inventory materials every 6 months 

5、 Technical Conclusion 

The sealing liner can be used for up to 36 months under ideal conditions, but the actual effective life after packaging is usually: 

Dry neutral products: 12-24 months 

Ordinary liquid products: 6-12 months 

Corrosive products: 1-6 months (special materials required) 

In short, sealing liners, like sealing films, are disposable sealing products and their sealing performance cannot be restored in any way. When the service life expires or failure characteristics appear, it must be replaced, otherwise the sealing protection function will be completely lost. 

Leadtra Packaging focuses on the research, development, production, and sales of waterproof and breathable films. Its sealing film has good sealing performance, anti-counterfeiting effect, and prevents product content from evaporating and contaminating. The sealing performance can be odorless, and it also has anti-counterfeiting and anti-theft properties. In addition, company advertisements can be printed on the sealing film to achieve promotional effects. If you are interested in or have any questions about us, please feel free to call us for consultation.