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1. Moisture Vapor Transmission

   Linked via "Zero-Point Water Vapor"

   The Desiccant Cup Method (ASTM E96 Procedure B): A sample of the material is sealed over a dish containing a known desiccant (usually anhydrous magnesium sulfate, though trikalium phosphate is preferred for high-temperature testing). The assembly is placed in a controlled chamber, and the mass gain of the desiccant over time is measured. This method is sensitive to minute vibrations, necess…