MaTestLab > Test Standards > ASTM F1249 Determination of Water Vapor Transmission Rate through Plastic Film and Sheeting
ASTM F1249 Determination of Water Vapor Transmission Rate through Plastic Film and Sheeting
ASTM F1249 is a standard test method used to determine the water vapor transmission rate (WVTR) through plastic films and sheeting. This test method is commonly used in the packaging industry by manufacturers, distributors, and end-users of plastic films and sheeting to assess the water vapor barrier properties of materials used in packaging applications.
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Introduction to ASTM F1249
ASTM F1249 is a standard test method that provides a procedure for determining the water vapor transmission rate (WVTR) through plastic films and sheeting. The WVTR is a measure of the amount of water vapor that passes through a unit area of the plastic material in a specific time period. The WVTR is an important property of plastic films and sheeting, as it affects the shelf life and quality of products packaged in these materials. The standard method involves the use of a modulated infrared sensor to measure the WVTR of the plastic material.
ASTM F1249 Test Method
The ASTM F1249 standard test method provides a procedure for measuring the WVTR of plastic films and sheeting. The test method involves placing a sample of the plastic material in a test cell, which is then exposed to a constant temperature and relative humidity. The WVTR is measured using a modulated infrared sensor, which detects the water vapor that passes through the plastic material. The test results are reported as the WVTR of the plastic material.
Measuring WVTR
The WVTR is determined by measuring the weight gain of a desiccant placed on the dry side of the specimen over a set time period. The desiccant is used to absorb the water vapor that diffuses through the specimen. The weight gain of the desiccant is then used to calculate the WVTR of the specimen.
Results reporting
The WVTR is reported in units of grams per square meter per day (g/m ²day) or in units of water vapor transmission rate (WVTR) in units of g/100 in²/day.
ASTM F1249 Specimens
Specimen Details
The specimens used in the ASTM F1249 standard test method are samples of plastic films and sheeting.
Specimen dimensions
The acceptable specimen thickness for ASTM F1249 is in mm (in.)
Specimen preparation
The specimens are prepared by cutting a sample of the plastic film or sheeting to the required size and shape. The specimen is then placed in the test cell and sealed to ensure that no air or water vapor can leak through the edges of the specimen.
ASTM F1249 Results
The results of the ASTM F1249 standard test method are reported as the water vapor transmission rate (WVTR) of the plastic material. The WVTR is calculated based on the amount of water vapor that passes through the specimen over a specific time period. By measuring the WVTR, manufacturers can ensure that their packaging materials provide adequate protection against moisture and humidity, which can cause spoilage, degradation, or other undesirable effects.
The test results are critical for determining the suitability of the plastic material for specific packaging applications.
Tests related to ASTM F1249
ASTM F1249 is related to several other ASTM standards that set requirements for packaging materials, such as ASTM D1653 and ASTM D3985. ASTM D1653 provides a test method for determining the moisture vapor transmission rate (MVTR) of plastic films and sheeting, while ASTM D3985 provides a test method for determining the oxygen transmission rate (OTR) of plastic films and sheeting. These tests are essential for determining the barrier properties of plastic materials used for packaging applications.
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