For determining the water vapor transmission rate of materials such as film, sheet, paper and paperboard - ISO 2528
ISO 2528 is a standard developed by the International Organization for Standardization (ISO) and is specifically used to determine the water vapor transmission rate of materials such as films, sheets, paper and paperboard. The following is a detailed introduction to the standard:
Introduction to the standard
Standard name: ISO 2528:2017 - Sheet materials - Determination of water vapour transmission rate - Gravimetric (dish) method
Issuing unit: International Organization for Standardization (ISO)
Scope of application: Applicable to the determination of the water vapor transmission rate of materials such as films, sheets, paper and paperboard under certain temperature and humidity conditions.
Measurement principle
ISO 2528 standard uses the weighing method (gravimetric method) to determine the water vapor transmission rate of materials under specific temperature and humidity conditions. By measuring the amount of water vapor passing through the sample in a certain period of time, its transmission rate is calculated.
Test method
Equipment and materials
Test cup (weighing dish): The bottom is filled with water or desiccant, and the top is covered with the sample to be tested.
Sealing material: Used to fix the sample on the test cup to ensure a good seal.
Constant temperature and humidity environment box: Used to keep the temperature and humidity of the test environment stable.
Precision balance: used to measure the weight change of the test cup, with an accuracy of 0.001g.
Test steps
Sample preparation: Cut the material to be tested (film, sheet, paper or cardboard) into appropriate size, usually round or square, and ensure that the sample is flat and undamaged.
Installation of sample: Fix the sample on the test cup and use sealing material to ensure that the edges of the sample are well sealed.
Initial weighing: Place the test cup in a constant temperature and humidity environment box and record the initial weight.
Test process: Weigh the test cup regularly at certain time intervals and record the weight change. The test time is usually 24 hours.
Calculate WVTR: Calculate the water vapor transmission rate based on the weight change and time interval.
Calculation formula
WVTR=Δm/A*t?
WVTR: Water vapor transmission rate, in g/m²·day.
Δm: Change in the weight of the test cup during the test time, in g.
A: Effective area of ??the sample, in m².
t: test time, in day.
Notes
Environmental control: Ensure that the temperature and humidity of the test environment are stable, usually 23°C and 50% relative humidity.
Sample handling: The sample should be kept flat, undamaged, and free of contamination.
Equipment calibration: Calibrate the test equipment regularly to ensure its measurement accuracy and the reliability of the results.
Sealing: Ensure the sealing of the test cup and the sample to prevent the entry of outside air and affect the test results.
Application areas
The ISO 2528 standard is applicable to the water vapor transmission rate test of various films, sheets, paper and paperboard materials, and is widely used in food packaging, pharmaceutical packaging, industrial materials, building materials and other fields.
Result application
By following the ISO 2528 standard, the water vapor transmission rate of the material can be accurately determined, providing a scientific basis for material selection, quality control and product development, and ensuring that the performance of the material in actual application meets the requirements. This is of great significance for ensuring the protective performance of packaging materials, especially moisture-proof performance.
In summary, the ISO 2528 standard provides a standardized method for measuring the water vapor transmission rate of film, sheet, paper and paperboard materials, ensuring consistency and reliability of test results, which helps improve the quality and performance of materials.
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