Method for testing water vapor transmission rate of rubber and plastic insulation pipe

Method for testing water vapor transmission rate of rubber and plastic insulation pipe

The water vapor transmission rate test of rubber and plastic insulation pipes mainly refers to the standard: BS EN 13469-2001 "Insulation products for building equipment and industrial facilities, and determination of water vapor transmission rate of prefabricated pipe insulation layers". This standard requires the test chamber environment to be controlled at a constant temperature and humidity of (23 ± 1) °C and relative humidity (50 ± 3)%. The air velocity in the chamber is between 0.02 m/s and 0.3 m/s. The intercept height of the specimen is (100 ± 1) mm. If the outer diameter of the specimen is larger than 100 mm, it is taken at 150 mm. Keep the section as smooth as possible. A certain amount of desiccant (providing a 0% humidity environment) was placed inside the sample, and the upper and lower ports were sealed with aluminum foil. Thus, there is a humidity difference between the 0% humidity inside the sample and the 50% humidity in the test chamber, and the water vapor in the test chamber will penetrate into the inside of the sample. The water vapor transmission rate can be calculated by periodically weighing the sample cup.