Summary: For building Waterproof breathable membrane ， Waterproof breathable membrane Mainly A layer of functional membrane laid outside the thermal insulation layer of building envelope It is suitable for curtain wall, profiled steel sheet, steel structure, masonry and other composite external walls and pitched roofs, with the function of energy saving and improving building durability. The water vapor permeability tester is used to test the barrier performance of the waterproof and breathable film against the external water vapor. The basic process of the test, the scope of application of the test equipment, equipment parameters, etc. are introduced,
key word ： For building Permeable membrane 、 Steam permeable waterproof cushion 、 Vapor barrier , weighing method Water vapor transmittance Water vapor transmittance tester
1. Meaning
The resistance to external water vapor (i.e. moisture resistance) is an important performance index of various materials such as building materials. The material aging caused by water vapor can be prevented and solved by testing and analyzing the water vapor permeability of materials
Waterproof breathable membrane It is a new type of polymer waterproof material, which is mainly used in steel structure, wood structure roof and decent building Waterproof breathable membrane The purpose is to prevent moisture, help water vapor to be discharged quickly, and protect and maintain the thermal performance of the structure; Function of improving building durability
2. Reference Standards
Breathable waterproof cushion （ Waterproof breathable membrane ） JC/T2291-2014 GB/T 17146 Test temperature (23 0.6) ℃ Relative temperature difference (90 ± 2)%
2.1 Test principle
This equipment adopts the measuring principle of weighing method. During the test, the sample is clamped in a moisture permeable cup, and a certain humidity difference is formed on both sides of the sample. Under the effect of the humidity difference, water vapor will penetrate from the high humidity side through the sample to the low humidity side. By measuring the change of the weight of the moisture permeable cup with time, the parameters such as the water vapor permeability of the sample can be obtained.
2.2 Scope of application
(1) This equipment is mainly applicable to Waterproof breathable membrane 、 Vapor barrier 、 Diaphragm Damp proof membrane Test of water vapor permeability of materials such as.
2.3 Equipment parameters
l The scope of equipment testing is 0.1 ~ 10000 g/m two ·24h , resolution is 0.01 g/m two ·24h。
l The temperature control range of the equipment is （ 23 0.6) ℃, temperature control accuracy of ± 0.1 ℃, humidity control range of 90% RH, humidity control accuracy of ± 1% R
L The equipment is equipped with three moisture permeable cups, which can be tested separately.
L The system adopts the intermittent weighing method that meets the standard requirements, and ensures the constant humidity difference between the inside and outside of the soaking cup through the standard purging wind speed.
L The equipment provides two rapid calibration methods, namely standard film and standard weight, to ensure the accuracy and versatility of the test data.
L The equipment supports the comparison of test results. The user sets the standard value and error range before the test starts. After the test is completed, the system automatically judges whether each test result is within the standard error range and visually informs the user.
3. Test process
(1) Waterproof breathable membrane The cutting diameter is 74 mm Sample of 3 pieces.
(2) Clamp the test pieces in Add proper amount of distilled water into the three moisture permeable cups, and then place them on the moisture permeable cup brackets inside the equipment, and close the test chamber door.
(3) Set sample name: Waterproof breathable membrane 、（ Steam permeable waterproof cushion ）
(4) Sample thickness, 0.3MM waterproof breathable membrane 、 0.49MM waterproof breathable membrane
(5) Test temperature: （ 23 0.6) ℃ Test humidity: （ 90±2）%
(6) Click the "Start Test" option.
(7) After the test, the instrument automatically calculates and displays the test results.
4. Test results
The water vapor transmittance of the three samples tested in this paper is 500.7g/(m two ·24h)，521.3g/(m two · 24h)，524.3 g/(m two · 24h)。 Average: five hundred and fifteen point four g/ (m two ·24h)，
5. Conclusion
This water vapor transmittance tester is a professional water vapor transmittance tester for waterproof and breathable film testing. It is simple to operate, high in test accuracy, and good in repeatability, and can truly reflect the moisture resistance of waterproof and breathable film materials.
The vapor transmittance tester used by our company is consistent with the equipment of Suzhou Waterproof Testing Institute and Beijing Building Materials Testing Center, and has passed the Building Waterproof Association Acceptance of standardization laboratory 。
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