Water vapor transmission rate (WVTR) of plastic films with the gravimetric dish method
The gravimetric dish method can be used to determine the water vapor transmission rate (WVTR) of materials that have a high water vapor permeability.
This method is intended for plastic films or sheeting materials with a water transmission rate of over 1 g/m2/day. The maximum sample thickness is 3 mm.
In the test, a water-absorbent material is placed in a metal cup that is covered by the studied material, which is sealed to the cup with wax. The test sample is placed in a conditioned cabinet and its mass is measured. From this, the WVTR value can be calculated.
The method is not applicable for materials that are damaged by hot wax or shrink under the used test conditions.
More information about the method family:
Water vapor transmission rate (WVTR)- Suitable sample matrices
- Single- and multilayer polymeric films up to 3 mm thick.
- Required sample quantity
- Four A4 sheets
- Typical turnaround time
- 3 weeks after receiving the samples
- Available quality systems
- Accredited testing laboratory
- Device types
- Standard
- Method expert
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Ryan Johnsson
Packaging
Paper and board
Polymers and plastics
Textiles and furniture
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