Rerurn to Romy the Cat's Site
In the Forum: Horn-Loaded Speakers
In the Thread: Macondo’s Midbass Project – the grown up time.
Post Subject: Foam ExpansionPosted by Paul S on: 8/31/2010
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Jessie is correct about the forcefulness of the expansion of many over-the-counter foams, like generic Great Stuff from Home Depot, etc. In fact, many homebuilders were having problems with the foam they put around door and window frames, etc. during construction; the foam was expanding to the extent that it forced the door and window jambs/frames so out of shape that they would not work properly when the time came. This led to the development of "controled expansion" foams, by Hilte and others (perhaps Great Stuff, too, by now...). These and similar foams do not "force" their way but only expand where the going is easy.
I am not sure what you mean by "rigid" foam. Even the controlled expansion foams are probably rigid enough for use in a back chamber, once they have set up, and they are also far more "predictable" in terms of which space they will occupy and which space they will let be.
Paul SRerurn to Romy the Cat's Site