JIS K 7129-4:2019 specifies an instrumental method for determining the water vapour transmission rate of plastic film, plastic sheeting and multi-layer structures including plastics, which have smooth surfaces without any embossed portions, using a gas chromatograph.
JIS K 7129-4:2019
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Plastics — Film and sheeting — Determination of water vapour transmission rate — Part 4: Gas-chromatographic detection sensor method
Japanese Industrial Standard / Japanese Standards Association , 01/01/2019
