Perlites and found with the Borates and all part of the volcanic geological evolution. We have a lot of Perlites in our Sierra Nevadas in California. Same with borates (borax). Borates, perlites, colemanites, - all that stuff can be found anywhere you have an escarpment of raised mountains due to ancient volcanic magma "scarns" and earthquake activity especially next to an arid desert bowl.
What is Perlite? http://www.perlite.info/hbk/0034409.htm Perlite is not a trade name but a generic term for naturally occurring siliceous volcanic rock. The distinguishing feature which sets perlite apart from other volcanic glasses is that when heated to a suitable point in its softening range, it expands from four to twenty times its original volume. This expansion process is due to the presence of two to six percent combined water in the crude perlite rock. When quickly heated to above 1600 F (870 C) the crude rock pops in a manner similar to popcorn as the combined water vaporizes and creates countless tiny bubbles in the softened glassy particles. It is these tiny glass-sealed bubbles which account for the amazing lightweight and other exceptional physical properties of expanded perlite. The expansion process also creates one of perlite's most distinguishing characteristics: its white color. While the crude perlite rock may range from transparent to light gray to glossy black, the color of expanded perlite ranges from snowy white to grayish white. Expanded perlite can be manufactured to weigh from 2 lbs/ft3 (32 kg/m3) to 15 lb/ft3 (240 kg/m3) making it adaptable for numerous uses, including filtration, horticultural applications, insulation, inert carriers and a multitude of filler applications. --- Guag Meister <[EMAIL PROTECTED]> wrote: > Hi All ; > > Could I ask a stupid question? What is Perlite? > > Best Regards, > Peter G. > Thailand > > --- Keith Addison <[EMAIL PROTECTED]> > wrote: > > > Hi Martin > > > > >Hi Keith et al, > > >I used Perlite mixed with refractory cement in my > > aluminum casting > > >furnace. The walls saw temperatures surpassing > > 2000F, it was working > > >well. The mixture was 50/50, and the perlite is > > very light-weight, > > >reducing the overall mass of the structure. > > >-- > > >Martin K > > > > Perlite gives very similar results to rice husk > ash. > > Michael Allen > > and I discussed Perlite in this context when I > made > > that page on rice > > husk ash. You used the same ratio of cement as I > do > > with RHA, after > > trying it 20 different ways in tests. > > > > Regards > > > > Keith > > > > > > > > >Keith Addison wrote: > > >>Hi Doug > > >> > > >>Nothing to do with soap, but do you know about > > this? > > >> > > > >>http://journeytoforever.org/at_woodstove-allen.html > > >>Rice-husk stoves - Appropriate technology: > Journey > > to Forever > > >> > > >>This stuff is great! We're using it to build > > charcoal-burning > > >>stoves, it's an excellent insulator. Have a look > > at this picture: > > >> > > >>http://journeytoforever.org/bflpics/rhahand2.jpg > > >> > > >>Those coals are really hot! > > >> > > >>Reduced strength, as you say, but we find that a > > mix of 1:3 up to > > >>1:1 cement to rice husk ash by weight is pretty > > strong, and since > > >>the RHA is much lighter than the cement, in fact > > you don't use a > > >>lot of cement. It's a bit like pumice or > > something. Doesn't weigh > > >>very much. > > >> > > >>The rice husk burner works very well, but if you > > want to put it in > > >>a 55-gal/200 litre oil drum, as we did, you'll > > have to make the > > >>cage slightly smaller. > > >> > > >> > > >>>Hi, > > >>>I am searching for information on making > aerated > > concrete. For those > > >>>interested, basically foam is added to a mortar > > mix, and the > > >>>mortar can be up > > >>>to double the quantity, with reduced strength, > > but added insulation. > > >>>This is achieved with an organic soap (from > what > > I have found), but I was > > >>>wondering if anyone had seen info on using home > > made soap? > > >>> > > > >>><http://pelagic.wavyhill.xsmail.com/cellcrete_how.html> > > is a site > > >>>I found with > > >>>a home made processor > > >>> > > >>> >From my search on the web, protein > > hydrolisation seems to be the > > >>>soap/additive > > >>>that is used for making the foam. I have not > > found any more info on how this > > >>>is made though. > > >>> > > >>>Can anyone help me?? > > >>> > > >>>regards Doug > > >>> > > >>>(I am interested in making tilt up concrete > > panels for a building.) > > > > _______________________________________________ > > Biofuel mailing list > > [EMAIL PROTECTED] > > http://wwia.org/mailman/listinfo.cgi/biofuel > > > > Biofuel at Journey to Forever: > > http://journeytoforever.org/biofuel.html > > > > Biofuel archives at Infoarchive.net (searchable): > > http://infoarchive.net/sgroup/biofuel/ > > > > > > > __________________________________ > Do you Yahoo!? > Meet the all-new My Yahoo! - Try it today! > http://my.yahoo.com > > > _______________________________________________ > Biofuel mailing list > [EMAIL PROTECTED] > http://wwia.org/mailman/listinfo.cgi/biofuel > > Biofuel at Journey to Forever: > http://journeytoforever.org/biofuel.html > > Biofuel archives at Infoarchive.net (searchable): > http://infoarchive.net/sgroup/biofuel/ > __________________________________________________ Do You Yahoo!? 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