Water vapourtransmission rate: An indication which determines the waterproof qualities of packaging paper.
透湿度：鉴定包装纸的防水性能的质量指标。
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Results showed that composite material had good biological defence property and water vapourtransmission rate. Biological clothing had a reasonable structure.
结果表明：该复合面料具有优良的生物防护性和透湿性，防护服结构合理。
3
Water vapourtransmission rate (WVTR) : Mass of water vapour transmitted through a unit area in a unit time under specified conditions of temperature and humidity.