How long does the pressure-sensitive aluminum foil seal?

There is no fixed standard for the duration of the sealing effect of pressure sensitive aluminum foil, which is generally 2-3 years under normal indoor conditions. Mainly affected by the following factors:
Material self factor
Aluminum foil quality: high purity, uniform texture, moderate thickness of aluminum foil, can provide better barrier property and physical strength, can make the sealing effect to maintain longer.
Pressure-sensitive adhesive properties: High-quality pressure-sensitive adhesive has good viscosity retention, weather resistance and chemical stability. If the initial viscosity of the pressure-sensitive adhesive is high and can be maintained for a long time, the sealing effect lasts a long time; If the quality of the pressure sensitive adhesive is poor, there may be a decrease in viscosity and seal failure in a few months.
Environmental factors of use
Temperature: Under normal temperature environment, the sealing effect of pressure sensitive aluminum foil can be better maintained. However, in a high temperature environment for a long time, such as more than 60 ° C, the pressure sensitive adhesive may become soft and flow, resulting in a decrease in viscosity, and the sealing effect may be affected in a few months or even less time; In a low temperature environment, the pressure sensitive adhesive becomes hard and brittle, and the viscosity is weakened, which may make the sealing effect decrease significantly in about 1 year.
Humidity: In a high humidity environment, the pressure sensitive adhesive may absorb water and reduce viscosity, generally in an environment with relative humidity of more than 80%, the sealing effect may be significantly worse in 1-2 years; If the environment is very dry, the pressure sensitive adhesive may also harden due to water loss, affecting the sealing effect.
Chemical substances: If the pressure sensitive aluminum foil is exposed to organic solvents, acids and bases and other chemicals, it may corrode the aluminum foil or make the pressure sensitive adhesive dissolve and deteriorate, resulting in a rapid failure of the sealing effect, which may take only a few weeks or even days.
Application object factor
Surface characteristics of the sealed object: if the surface of the sealed object is smooth and clean, the pressure sensitive aluminum foil can be closely fitted to the surface, and the sealing effect lasts longer; If the surface is rough, porous or there is oil, dust, etc., the pressure sensitive aluminum foil is difficult to adhere well, and the sealing effect may be greatly reduced in about 1 year.
Properties of the sealed substance: If the sealed substance is volatile and corrosive, it may affect the viscosity of the pressure sensitive adhesive through the aluminum foil and shorten the duration of the sealing effect; If it is just an ordinary dry solid item, it has little effect on the sealing of the pressure-sensitive aluminum foil, and the sealing effect lasts relatively long.
Use and operation factors
Pressure application: the pressure applied during sealing is uniform and moderate, and the pressure-sensitive aluminum foil can fully contact the surface of the sealed object, which can make the sealing effect better and last longer; If the pressure is too small, the seal is not strong, may soon appear sealing problems; Excessive pressure may extrude too much pressure-sensitive adhesive or damage aluminum foil, which will also affect the long-term effect of sealing.
Frequency of use: Frequent opening and closing of the seal will continuously destroy the viscous structure of the pressure-sensitive adhesive, so that the duration of the sealing effect is shortened. If the container is sealed for frequently accessed items, the sealing effect may be significantly less than the initial state after a few months.