Methods of testing plastics. Other properties. Determination of water vapour transmission rate (dish method)

This specification outlines a standardized procedure for evaluating the water vapor transmission rate of plastic materials using the dish method. It establishes specific experimental conditions and measurement techniques to ensure consistent and comparable results across different testing laboratories. The method focuses on the permeation of water vapor through thin plastic sheets or films under controlled temperature and humidity gradients. Test specimens are mounted in a specially designed container that maintains a defined atmospheric environment on either side of the material sample. By measuring the rate at which moisture passes through the specimen over a set period, the procedure provides data essential for assessing barrier properties. This approach is particularly relevant for applications where moisture resistance is a critical performance factor, such as packaging, construction materials, and industrial components. The protocol defines sample preparation requirements, conditioning procedures, and the calculation methods for deriving the transmission rate. Adherence to these defined parameters allows for the generation of reliable technical data used in material selection and quality assurance processes.