Moisture Vapor Transmission Rate
(and why it’s so critical)
In assembling thermal glass window panels you’ve probably heard the term “MVTR” and probably have a general idea of what it means and how it works. True or not we want to highlight the significance of MVTR and why it makes a difference in how well a thermal adhesive works.
First off, of course it is what it sounds like. The rate at which moisture vapor transfers through a given material. There are materials where a high MVTR is desire, such as athletic wear or breathable tent materials and also areas like Thermal Glass Adhesive where you want as low an MVTR as possible to prevent transmission and breakdown of materials. The overall point of a thermal quality adhesive of course is to prevent coldness or warmth from transferring between one panel and another. By holding that MVTR as low as possible, you reduce that transfer of heat or cold air.
The point is that the MVTR of the adhesives selected will impact how much warmth or cool makes it through. It impacts other important material properties as well, specifically “longevity” of the adhesive properties. So if your goal is to hold the fabrication together, (and it is) you want need that low rating. Delchem’s products are all class-leading but of course our newest and most advanced product, D-2000 maintains the industries lowest MVTR to allow your products to stand out as well.
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