Guag - One of my favoite borates is called Ulexite. Ulexite is called a "natural fiber optic" by scientists and "TV rock" by children. It exists in oxidized form as a rock but you can see throught the rock because it allows light to pass through its crystalline structure - thus transmistting the light. Take a look:
http://www.gc.maricopa.edu/earthsci/imagearchive/ulexite.htm The natural world is a great. Phillip Wolfe --- Phillip Wolfe <[EMAIL PROTECTED]> wrote: > 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 > === message truncated === __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! 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