2. Detection of water vapor transmission rate At present, the commonly used water vapor transmission rate test methods at home and abroad are shown in Table 2. From the detection principle, there are mainly two types of weighing methods and infrared detection methods.
Table 2 Test methods for water vapor permeability
Table 2 Test methods for water vapor permeability
Test Method Test Method Name Sample Type Diffusant Test Method Test Conditions ASTM D895-1994 Standard Test Method for Water Vapor Transmission of Packages Steam Vapor Weight Gain for Packages Typically PH=90% 100°F (38°C) ASTM D1251- 1994 Standard Test Method for Periodically Determining Water Vapor Transmission Rate of Packages Steam Wrap Weight Gain 1 Cycle = 0 (-18°C x 1 Day + 100°F (38°C x 6 Days RH = 90%) ASTM D2684- 2001 Standard Test Method for Determining the Permeability of Plastic Containers for Packaging or Special Products Packaging Product or Steam Weight Gain or Weight Reduction Relative Humidity 50% 73°F (23°C) or 122°F (50°C) ASTM D3079- 1999 Standard Test Method for Determination of Water Vapor Transmission Through Flexible Packaging Bags for Dry Products RH=90% Packing Water Vapor Weighting 100°F (38°C) ASTM D3199-1994 Water Vapor Transmission Rate for Cushioned Screw Caps Standard Test Method Package Water Vapor Weight Gain or Weight Loss RH=25% 100°F (38°C)
RH=75% when installed with desiccant 100°F (38°C) ASTM E96-2000 Standard method for determination of water vapour permeability of material Water vapour gain or weight reduction Desiccant method: RH=90% 100°F (38°C) )
Water Method: 50% 100°F (32°C) ASTM F372-1999 Standard Test Method for Determination of Water Vapor Transmission of Soft Barrier Materials by Infrared Sensitives Material (up to 3mm) Steam Infrared Sensing Method 100°F (38) °C) RH = 81%, 90% or 100% ASTM D1653-1999 Standard Test Method for Water Vapor Transmission Rate of Organic Coating Films Material Vapor Weight Gain or Weight Loss 100°F (38°C) Dry Cup Method and Wet Cup Class II ASTM F1249-1995 Standard Test Method for Determination of Water Vapor Permeability of Plastic Films and Sheets by Infrared Sensing Method Material (Up to 3 mm) Steam Infrared Sensing Method 100°F (38°C) RH = 90% or 100% ISO 2528-1995 Detection method for water vapor transmission of thin sheet materials - Disk material (up to 3 mm) Water vapor gain RH = 90% 25°C or 38°C (generally 38°C)
RH=75% 25°C
Materials with a moisture permeability of less than 1g/m2·24h are not recommended for this method. GB/T 1037-1998 (refer to ASTM-E96) Plastic film and sheet through water vapour test method - cup material steam weight RH = 90 % 25°C or 23°C GB/T-6928-1997 (equivalent to the 3030 procedure in FED-STD-101) Packaging Material Test - Moisture Permeability Material Water Vapor Weight Gain Method A is only applicable to moisture permeability greater than 1g/ M2 · 24h) thickness less than 3mm material
The B method is used for heat sealable materials that can be made into bags and have a low moisture permeability.
Method A: 38°C RH = 92%; 23°C RH = 50% 45°C RH = 83%; -18°C RH = 95%
Method B: 38°C RH=90% GB/T6981-1986 Test method for moisture permeability of hard-pack containers Steam-weighted package
RH=75% when installed with desiccant 100°F (38°C) ASTM E96-2000 Standard method for determination of water vapour permeability of material Water vapour gain or weight reduction Desiccant method: RH=90% 100°F (38°C) )
Water Method: 50% 100°F (32°C) ASTM F372-1999 Standard Test Method for Determination of Water Vapor Transmission of Soft Barrier Materials by Infrared Sensitives Material (up to 3mm) Steam Infrared Sensing Method 100°F (38) °C) RH = 81%, 90% or 100% ASTM D1653-1999 Standard Test Method for Water Vapor Transmission Rate of Organic Coating Films Material Vapor Weight Gain or Weight Loss 100°F (38°C) Dry Cup Method and Wet Cup Class II ASTM F1249-1995 Standard Test Method for Determination of Water Vapor Permeability of Plastic Films and Sheets by Infrared Sensing Method Material (Up to 3 mm) Steam Infrared Sensing Method 100°F (38°C) RH = 90% or 100% ISO 2528-1995 Detection method for water vapor transmission of thin sheet materials - Disk material (up to 3 mm) Water vapor gain RH = 90% 25°C or 38°C (generally 38°C)
RH=75% 25°C
Materials with a moisture permeability of less than 1g/m2·24h are not recommended for this method. GB/T 1037-1998 (refer to ASTM-E96) Plastic film and sheet through water vapour test method - cup material steam weight RH = 90 % 25°C or 23°C GB/T-6928-1997 (equivalent to the 3030 procedure in FED-STD-101) Packaging Material Test - Moisture Permeability Material Water Vapor Weight Gain Method A is only applicable to moisture permeability greater than 1g/ M2 · 24h) thickness less than 3mm material
The B method is used for heat sealable materials that can be made into bags and have a low moisture permeability.
Method A: 38°C RH = 92%; 23°C RH = 50% 45°C RH = 83%; -18°C RH = 95%
Method B: 38°C RH=90% GB/T6981-1986 Test method for moisture permeability of hard-pack containers Steam-weighted package
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