Water Vapor Transmission Test Of High Polymer Waterproof Membrane

Energy efficiency of architectures has drawn increasing attention by governments;

and correspondingly, high polymer waterproof membrane has been emphatically promoted. High polymer waterproof membrane is a new type of environmental friendly and energy efficient material. It can strengthen gas barrier and water barrier properties of buildings while facilitate speedy water vapor outlet as a result of its unique water vapor transmission feature. Thus, the structures of buildings are protected from mildewing; residents health is guaranteed; and properties avert from devaluation. Hereinafter this article is to briefly introduce the water vapor transmission test of high polymer waterproof membrane with Labthink W3/030 Water Vapor Transmission Rate Tester.

1. Working Principle of High Polymer Waterproof Membrane

In the state of water vapor, water particles are extremely tiny. According to capillary action, such water vapor particles would permeate to the other side of the capillary tube and result in water vapor transmission. When water vapor condensed into larger-sized water drop, the water molecules couldnt permeate to the other side due to the tension effect between water molecules. Therefore the water permeation is hindered by the high polymer waterproof membrane.

Significance of Water Vapor Transmission of High Polymer Waterproof Membrane

The condensation of water vapor between outside wall and inside wall would seriously influence the performance of insulation material and the durability of building envelop and cause the mildewing. The main cause of mildewing problem is the water either in liquid phase or gas phase which would permeate to the building envelop with the air from the outdoors. In some early buildings, waterproof membrane is laid outside the insulation layer to strengthen the water barrier and gas barrier property. However, in this way, as the waterproof membrane is not breathable to water vapor, the water vapor inside building envelop could not be released and thus cause the mildewing problem. The introduction of high polymer waterproof membrane in buildings keep the water phase and gas phase water outside the building and at the same time release the water vapor in insulation layer rapidly. With the application of air layer and high polymer waterproof membrane, water barrier and gas barrier property could be improved hence mildewing problem could be avoided. Meanwhile the performance of insulation layer could be guaranteed which efficiently realize energy efficiency.

3. Water Vapor Transmission Rate Test of High Polymer Waterproof Membrane

It is clearly stipulated in Technical specification for waterproof and protection of exterior wall building that the water vapor transmission test of high polymer waterproof membrane should be carried out as follows: a specific humidity difference is formed between the two sides of the specimen (high polymer waterproof membrane) under a certain temperature. Water vapor permeates through the specimen and into the dry side. By measuring the weight changes of the cup, water vapor transmission rate and other parameters can be obtained. Labthink W3/030 Water Vapor Transmission Rate Tester, with the application of highly precise weighing sensor, could efficiently shorten the judge time for osmotic balance thus speed up the whole test process. Additionally, humidity and temperature control are designed in association with weighing technology and computer control technology so that the test could be carried out in regulated environment. No manual intervention is needed in the process of test which avoids the external influences and ensures the accuracy of test results. Moreover, the tester is equipped with single chamber, 3-chamber, 6-chamber or 12-chamber, which could meet the requirements of different customers.

Besides water vapor transmission rate, it is necessary to test other indexes of high polymer waterproof membrane, which should be up to standards to ensure its performance and life span. For more information of this instrument, please visit www.labthink.cn.

by: Labthink

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