Water vapor transmission rate (WVTR) of plastic films and sheeting
Determination of the water vapor transmission rate (WVTR) according to the ASTM F1249 standard. WVTR describes the amount of water vapor that passes through a material over a set period. It is an important quality indicator in food and cosmetics packaging, as an effective moisture barrier is critical to keeping products fresh and preventing spoilage.
In this WVTR test, two samples per material are measured simultaneously to ensure the reliability of the measurement. The results are expressed as g/m2/day.
Please disclose the desired temperature (from 18 to 40°C) and the desired relative humidity (from 20% to 100%) when placing the order.
This measurement is applicable for plastic films and sheeting materials with WVTR values between 0.005 and 2400 g/m2/day. If you wish to test finished packaging instead, check out the WVTR measurement for packages.
More information about the method family:
Water vapor transmission rate (WVTR)- Suitable sample matrices
- Films and sheets of different plastic materials. The surfaces of the material need to be smooth to get trustworthy results. Maximum thickness 2.5 mm. The expected WVTR value should be between 0.001 and 2400 g/m2/day.
- Required sample quantity
- At least three sheets of the material are needed. Minimum sheet dimensions are 10 x 10 cm, but preferably 20 x 20 cm to ensure optimal quality.
- Typical turnaround time
- 3 weeks after receiving the samples
- Detection limit
- 0.005 to 2400 g/ m2/day
- Available quality systems
- Accredited testing laboratory
- Device types
- Standard
- Method expert
Packaging
Paper and board
Polymers and plastics
Textiles and furniture
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