EUROLAB laboratory provides testing and compliance services within the scope of JIS K-7129 standard. This Japanese Industry Standard JIS K-7129 serves to determine the water vapor transmission rate (WVTR) of plastic materials and can be applied to coated or uncoated plastic film and rubber sheet, for example. It is particularly suitable for determining ratios from 1 g/m2d to 200 g/m2d.
Under improved test conditions (eg air pressure control, long test time and constant test atmosphere), the method can also be used down to approx. 0,5 g/m2d.
Concept water vapor, transmission rate For the purposes of this standard, it means the mass of water vapor that passes, under specified conditions, from an evaporation chamber through the exposed surface of a sample to a test vessel per day and per square meter of sample area.
Water vapor transmission rate is not a material constant as it depends on factors including the thickness and matrix of the sample material. Samples with a thickness of more than 3 mm shall be tested as specified in ISO 9932. Above this thickness and above the water vapor transmission rate of 200 g/m2d, the accuracy of the measurement decreases.
Evaporation chamber with a controlled atmosphere (i.e. temperature relative humidity). The time required to regenerate the atmosphere after the chamber has been closed should be as short as possible and should not exceed 1% of the interval between weighings. If this requirement cannot be met due to the high water vapor transmission rate of the samples, this should be recorded in the test report.
This Standard specifies an instrumental method for determining the water vapor transmission rate of plastic film. It is applied to plastic sheeting and multi-layer structures, including plastics with smooth surfaces without any relief, using an infrared sensing sensor.
Our organization, EUROLAB, also provides JIS K-7129 Plastic Films and Coatings - Determination of Water Vapor Transmission Rate test services to enterprises within the framework of laboratory services of materials. Do not hesitate to contact our laboratory EUROLAB for your testing and certification requests.
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EUROLABreporting and certification activities, United Accreditation Foundation (UAF), Turkish Accreditation Agency (TÜRKAK) ve Enterprise Accreditation Foundation (EAF) based on the accreditation provided by the accreditation body. The Enterprise Accreditation Foundation (EAF) accreditation body is also a signatory of the United Nations (UN GLOBAL COMPACT) organization.
