A high-quality MgO Sulfate Board (Magnesium Sulfate(MgSO4) typically does not sweat or weep, even in high-humidity environments.
This is the primary reason the “Sulfate” version was developed.1 The “sweating” phenomenon is almost exclusively a failure of the older Magnesium Chloride (MgCl2) boards
Why Chloride Boards “Sweat” (The Failure)
Traditional MgO boards use Magnesium Chloride as a binder. This salt is hygroscopic, meaning ...
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2025






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