How is the breathability of medical TPU waterproof and breathable films measured?

2026-03-11
Fulian TPU film Professional Manufacturer in China
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The measurement of the moisture permeability of medical TPU waterproof and breathable films generally follows certain standards and methods. Moisture permeability refers to the ability of a material to allow water vapor to pass through under certain conditions. For medical TPU waterproof and breathable films, the measurement of breathability can be carried out through the following steps::

1. Sample preparation: Firstly, it is necessary to cut the TPU film into samples of standard sizes to ensure consistency and accuracy in the testing.

2. Test environment setup: The sample is placed in a moisture permeability testing device that is capable of simulating various temperature and humidity conditions in order to evaluate the performance of the membrane under different environments.

3. Moisture permeability testing: Under the established temperature and humidity conditions, measure the amount of water vapor that passes through the TPU film within a certain period of time. This typically involves placing the sample between two chambers with different humidity levels and measuring the rate at which water vapor moves from the chamber with higher humidity to the one with lower humidity.

4. Data recording and analysis: Record data during the testing process, including water vapor permeance, test duration, temperature, and humidity, and then use this data to calculate the moisture permeability rate.

5. Result evaluation: Based on the measurement results, assess whether the moisture permeability of the TPU film meets medical standards and requirements.

Tags： Medical TPU