ASTM C755热绝缘用水蒸气缓凝剂选择的标准规范
日期:2012-02-13 19:09
etarder materials.
As an example of the evaluation required, it may be impractical to specify a lower as installed value, because difficulties of field application often will preclude as installed attainment of the inherent WVT values of the vapor retarder materials used. The designer could approach this requirement by selecting a membrane retarder material that has a lower permeance manufactured in 5-ft (1.5-m) width or a sheet material 20 ft (6.1 m) wide having a higher permeance. These altern
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