水蒸气渗透率 water vapor permeability coefficient ; WVTR
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而要研制高阻隔性封装材料，首先要解决如何测量水蒸气、氧气和其他活性气体对封装材料的渗透率的问题。
How to accurately measure permeation rates of water vapor and oxygen through packaging materials is very important for developing high quality barrier packaging materials.
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