“…The foams set within approximately one minute, yielding friable, structurally weak foams that are permeable to water vapor. Initially the foams are wet, having a density of about 40 to 48 kg/m3. The moisture a evaporates over the course of several days or even weeks (some moisture is absorbed by the surrounding materials), leaving dry foams of a density normally within the range 9.5 to 13 kg/m3.…”