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Post by Agrarian Welder on Oct 23, 2011 16:27:35 GMT -8
I am having trouble finding an affordable source for perlite and vermiculite here in Central Texas. I've found perlite in a garden store for $6 per 8 qt. bag. However, I've seen volcanic lava rock for around $5 per 1 cubic foot bag. It is considerably lighter than regular rock but a bit heavier than perlite. How do y'all think this will perform as an insulator for the Mass Rocket Stove? Or where might be a good place to obtain perlite or vermiculite at a reasonable price.
Thanks,
Kelly
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Post by stovol on Oct 24, 2011 15:58:51 GMT -8
try anh refractory.. i bought a 55lb bag of insulating castable cement here at the knoxville tn location for 40 bucks .. its kastolite 26 li pl... 2600 degree.. built two stoves so far with it and about five lbs left.. i also bought a 60 dollar roll of inswool .. 50 sq ft.. i'm going to buy a gallon of rigidizer next time to stiffen the insulation.. it should make the castable cast easier.. the cardboard forms are just to flimsy if you make them and tape them.. id suggest a round cardboard form from lowes or such place.. (stiffer) .. my stove heats up fast and burns hotter than hell.. 5 inch syatem 24 inch high 16 inch burn chamber made from quarter inch tile board and the two previous mentioned materials.. leave out the ceramic fiber insulation and cast the stove thick and you could build a stove for $50.. if the guys below arent close to you they would know a competitor who is i'd bet
4585 Mint Way 214-330-9243 214-330-6085
Dallas, TX 75236
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Post by Agrarian Welder on Oct 26, 2011 17:26:56 GMT -8
After some further research I have discovered that "Lava Rock's" real name is Scoria. According to the wikipedia page on scoria, it is similar to pumice only heavier, they further go on to say that one of it's uses is high temperature insulation.
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Post by stovol on Oct 27, 2011 12:16:11 GMT -8
yes i've seen pics of people sawing the pumice into different shapes to insulate fire chambers.. i'd think that if you used it.. and sealed it somehow.. that once it warmed up the air caught in the rock would insulate well
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Post by pasto76 on Dec 15, 2011 18:06:42 GMT -8
what about using Scoria as mass in the bench? I have a full yard or more of it in my yard I want to get rid of.
Likewise, I have probably two yards of "cimarron" granite landscaping rock as well. Good for bench mass??
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Deleted
Deleted Member
Posts: 0
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Post by Deleted on Dec 16, 2011 2:22:35 GMT -8
Scoria is highly insulating.
For mass a sufficient heat distribution is needed.
Granite resists well temperatures up to 650°C/1200°F and can store relatively high amounts of energy.
However it is prone to thermal shock by high temperature differences.
Granite can contain relatively high amounts of uranium,
a potential natural radiological hazard.
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Post by swoprofessor on Mar 11, 2012 7:31:30 GMT -8
I was wondering how well limestone would be as a thermal mass. I know from experience at high temp it cracks. I lined a fire pit with them. I cant have that as the limestone I refer to is my house foundation/basement walls.
But if it could be done at a low to moderate temp like 200 degrees it would be such a boon as it is already there and from what I estimate I have ~ 80 tons of it in the basement walls. (if it matters ~ 150 linear feet more than 7 feet tall 1 foot thick is ~1078 ft^3 @ 150lbs per ft^3 )
So anyone know
1. would this work and without any chance of cracking
2. how would i set it up using a rocket stove.
3. one thing I cant figure out is how to spread the heat out to the whole linear of the house.
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